JP2011233962A - Receiver, transceiver unit employing the same and base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mitigate an operational frequency band of an A/D converter and to reduce receiver power consumption in a receiver capable of concurrently communicating in one or more communication frequency bands.SOLUTION: A receiver 1 includes a plurality of receiving blocks Rx Blk(a-e) for communicating with RF signals of communication bands, a matrix switch (22), and at least two or more A/D converters (23-27). The plurality of receiving blocks respectively include low noise amplifiers (2-6), mixers (7, 8, 9, 10, 11) and local signal generators (12-16). In the receiver 1, receiving analog signals from the plurality of receiving blocks are connected to the matrix switch (22). In the matrix switch, in accordance with the number of RF receiving signals received concurrently and a receiving signal frequency bandwidth of each RF receiving signal, a connection path of each receiving analog signal to the A/D converters (23-27) is switched.

Description

  The present invention relates to a receiver used for RF communication such as a cellular phone, a transmission / reception unit using the receiver, and a base station, and more particularly, to a plurality of communication frequency bands and a reception signal frequency band in each communication frequency band. The present invention relates to a receiver for RF communication in which is variable.

  Non-Patent Document 1 describes a transceiver that supports frequency aggregation. This transceiver includes a plurality of transmission blocks and reception blocks for each communication frequency band. Each receiving block uses a direct down-conversion receiver architecture and is composed of a low-noise amplifier, a demodulator that down-converts the RF received signal into a received analog baseband signal, an analog baseband filter, and an A / D converter. ing. The A / D converter included in each reception block requires an operation band equal to the maximum RF reception signal frequency bandwidth received in the corresponding communication frequency band.

  Patent Document 1 discloses a receiving device that inputs a wideband received signal to a plurality of A / D conversion circuits via a switch. The switch between the antenna and the reception block switches the connection path between each antenna and the reception block according to the radio wave strength at each antenna end.

  In Patent Document 2, one frequency block in which each beam of a multi-beam is fixedly assigned, and a plurality of frequency blocks dynamically assigned to a transmission beam through matrix switch means according to traffic. A multi-beam satellite communication system that utilizes and transmits signals is disclosed.

  Patent Document 3 describes a receiver that simultaneously receives a plurality of RF reception signals configured over a plurality of communication frequency bands. This receiver includes a plurality of reception blocks for each communication frequency band. Each reception block is configured with a Low-IF down-conversion receiver architecture. Each reception block includes an RF bandpass filter corresponding to each communication frequency band, a variable gain RF amplifier, an IF frequency conversion circuit unit, a baseband bandpass filter, and a variable gain baseband amplifier. The frequency conversion circuit unit includes a local signal transmitter, a frequency converter, and a PLL circuit. When receiving RF reception signals simultaneously from a plurality of communication frequency bands, each RF reception signal is down-converted to a different IF frequency band in the corresponding reception block. A plurality of received analog baseband signals having different IF frequencies are combined by an adder and processed as one wideband received analog baseband signal by a single A / D converter.

JP 2004-260403 A JP 2003-273789 A JP 2007-81878 A

R4-091204: 3GPP TSG RAN WG4 meeting # 50bis (Nokia), 2009

  Due to the demand for high-speed mobile phones, the second generation: GSM (Global System for Mobile Communication), the second and fifth generation: EDGE (Enhanced Data rates for GSM Evolution), and the third generation: WCDMA (Wideband Code Amulsion Code Amplification) 3.5th generation: HSPA (High Speed Packet Access) has continued to develop. In recent years, with the aim of further speeding up, 3.9th generation: LTE (Long Term Evolution), 4th generation: IMT-A (International Mobile Communications-Advanced) and new standards are 3GPP (Third Generation Partners). Is discussed. HSPA is expected to be accelerated to 20 MHz / 100 Mbps in LTE and 100 MHz / 1 Gbps in IMT-A with respect to the maximum received signal frequency band 5 MHz / maximum data rate 14 Mbps.

  In IMT-A, the realization of a data rate of 1 Gbps is expected, and the maximum received signal frequency band assigned to each user is 100 MHz.

  Due to the demand for higher speed of wireless communication, in the IMT-A communication method, a plurality of communication frequency bands (multi-communication frequency bands) are each divided into a maximum received signal frequency band, for example, a 100 MHz wide band to a plurality of received signal frequency bands. Depending on the number of users to be divided, the wideband use bandwidth is changed depending on the situation, such as using the entire band or using only a part of the band. In other words, the bandwidth to be used varies depending on the number of users who communicate at the same time. In IMT-A, the base station performs signal processing on the data signal in the baseband unit to convert the signal into a signal conforming to the standard, converts the digital signal into an analog signal by a D / A converter, and converts the analog signal into the analog signal. Modulation is performed and frequency conversion is performed to generate an RF signal. This RF signal is amplified and radiated as radio waves from the antenna. In the base station, it is determined how the RF signal to be transmitted to each user terminal can be allocated to a plurality of communication frequency bands and a wide reception signal frequency band according to the number of users performing simultaneous communication. These pieces of information are included in the communication protocol of the incoming packet that each user terminal receives from the base station. The user's receiving terminal extracts an analog signal from the RF signal received by the antenna, converts this analog signal into a digital signal by an A / D converter, and sends the signal to the baseband.

  However, it is difficult to secure a broadband received signal of 100 MHz in one communication frequency band from the viewpoint of frequency resources. Therefore, in IMT-A, in addition to a single band mode in which a received signal frequency band is allocated to one user within one communication frequency band, a frequency aggregation mode in which a received signal frequency band is allocated across a plurality of communication frequency bands is newly provided. It will be added. In the frequency aggregation mode, a reception signal frequency band of a maximum of 100 MHz can be secured by adding up the occupied bands in each communication frequency band. Accordingly, mobile phone terminals and mobile phone base stations require receivers that can simultaneously communicate in a plurality of communication frequency bands.

Prior to the present invention, the present inventors engaged in research on a receiver capable of IMT-A communication.
The inventors of the present invention have studied the reduction in power consumption and area of an IMT-A compatible receiver as follows.

  The IMT-A receiver needs to support a frequency aggregation mode for simultaneous reception in a maximum of five communication frequency bands and a single band mode for reception in a single communication frequency band. In each communication mode, the maximum received signal frequency bandwidth is 100 MHz.

  As described in Non-Patent Document 1, the present inventors have studied a configuration in which reception blocks are arranged for each communication frequency band. By using a direct conversion receiver architecture for the receiving block, it is possible to minimize the number of required components. However, in this configuration, at least five A / D converters are required to support a frequency aggregation mode with a maximum of five bands. Furthermore, each of the A / D converters must support a maximum 100 MHz band communication in the single band mode. As a result, it became clear that the operation bandwidth of the A / D converter requires 100 MHz or more, the power consumption increases, and the power consumption of the entire receiver becomes a problem.

  As described in Patent Document 3, in a configuration in which a reception block is arranged for each communication frequency band, a low-IF down-conversion receiver architecture is used for each reception block, and reception analog signals having different IF frequencies are generated. In the combining method, it is possible to configure one A / D converter. However, when IMT-A communication is supported with this configuration, the band of the combined Low-IF reception analog signal is 200 MHz at the maximum, so that the power consumption of the A / D converter increases. Also, in the synthesis process of received analog signals of different IF frequencies, the interference wave noise having the same frequency component as the IF frequency band of other received analog signals contained in a received analog signal is superimposed on the other received analog signals after the synthesis process. There is a problem that the reception sensitivity characteristic deteriorates. For this reason, each block requires a steep filter that removes the interfering wave signal of the frequency component that becomes an interference wave to other blocks, and it has become clear that it is disadvantageous in terms of the number of parts and area.

  The invention described in Patent Document 1 also employs a configuration in which reception blocks are arranged for each communication frequency band, and has the same problem as that of the invention described in Non-Patent Document 1.

  The invention described in Patent Document 2 is not premised on the IMT-A communication method, and does not disclose consideration for switching reception processing in accordance with the bandwidth of the reception signal.

The present invention has been made as a result of the study of the present inventors prior to the present invention as described above.
Accordingly, an object of the present invention is to reduce the power consumption of an IMT-A compatible receiver by reducing the operating frequency band of the A / D converter.
The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

  Of the inventions disclosed in the present application, the outline of typical ones will be briefly described as follows.

  That is, one typical receiver of the present invention corresponds to a plurality (N) of communication frequency bands, and a single or a plurality (M = 1 to N) of communication frequency bands within the plurality of communication frequency bands. A receiver for receiving an RF reception signal configured across a plurality of (N) reception blocks corresponding to each of the communication frequency bands and an output of each reception block. And at least one matrix switch, at least two or more A / D converters connected to the matrix switch, and a communication mode control unit for controlling the reception block, the matrix switch, and the A / D converter. Each of the plurality of reception blocks includes a reception demodulator and a reception local signal generation unit, and the reception demodulator generates the reception local signal generation The reception mode signal has a function of down-converting the RF reception signal into a reception analog signal, and the communication mode control unit is configured to use the single or The reception block corresponding to a plurality of communication frequency bands is selected, and control is performed to switch the matrix switch so as to form a connection path between the selected reception block and the A / D converter. .

  ADVANTAGE OF THE INVENTION According to this invention, in the receiver which can communicate simultaneously in a some communication frequency band, it becomes possible to ease the operating frequency band of an A / D converter and to reduce the power consumption of a receiver.

FIG. 3 shows a direct down-conversion receiver according to one embodiment of the invention. It is a figure which shows the detail of the principal part of the receiver shown in FIG. It is a figure which shows the example of communication frequency allocation in case the IMT-A standard is a single band mode. It is a figure which shows the example of communication frequency allocation at the time of IMT-A specification frequency aggregation mode. FIG. 3 is a diagram illustrating one of operation modes of the receiver illustrated in FIG. 2. FIG. 3 is a diagram illustrating one of operation modes of the receiver illustrated in FIG. 2. FIG. 3 is a diagram illustrating one of operation modes of the receiver illustrated in FIG. 2. FIG. 6 is a diagram illustrating an example of a Low-IF down-conversion receiver according to another embodiment of the present invention. It is operation | movement explanatory drawing of the receiver part shown to FIG. 7A. It is a figure which shows the principle of operation of the receiver shown to FIG. 7A. It is a figure which shows the relationship of the accuracy degradation sensitivity of a signal separation process by two LO signal phase difference and the amplitude and phase error of each LO signal in the receiver shown to FIG. FIG. 6 is a diagram illustrating a direct / Low-IF down-conversion receiver according to another embodiment of the present invention. It is a figure which shows one of the operation modes of the receiver shown in FIG. It is a figure which shows one of the operation modes of the receiver shown in FIG. It is a figure which shows one of the operation modes of the receiver shown in FIG. It is a figure which shows the matrix switch by other embodiment of this invention. FIG. 4 shows a direct down-conversion receiver for IMT-A communication according to another embodiment of the present invention. It is a block diagram which shows the structure of the mobile telephone carrying RFIC, RF module incorporating the antenna switch MMIC, RF power amplifier, and baseband signal processing LSI by other embodiment of this invention. According to another embodiment of the present invention, a mobile phone base station comprising an RF unit, an RF module comprising an RF power amplifier, a baseband signal processing LSI, and an antenna module comprising an antenna, a duplexer and a low noise amplifier. It is a block diagram which shows a structure.

<Typical embodiment>
First, an outline of a typical embodiment of the invention disclosed in the present application will be described. The reference numerals of the drawings referred to with parentheses in the outline description of the representative embodiments merely exemplify what are included in the concept of the components to which the reference numerals are attached.

  A receiver according to an exemplary embodiment of the present invention includes a plurality of reception blocks (Rx_Blk-a, b, c, d, e) that communicate with RF signals in a plurality of communication frequency bands, and a matrix switch (22). And at least two or more A / D converters (23, 24, 25, 26, 27) and a communication mode control unit (28).

  Each of the plurality of reception blocks includes a low noise amplifier (2, 3, 4, 5, 6), a mixer (7, 8, 9, 10, 11), and a local signal generator (12, 13, 14, 15 and 16) and baseband variable gain amplifiers (17, 18, 19, 20, 21).

  In each of the plurality of reception blocks, the mixer (7, 8, 9, 10, 11) receives an RF signal by the reception local signal supplied from the local signal generation unit (12, 13, 14, 15, 16). The signal is down-converted into received analog signals (IF_a, b, c, d, e).

  In the receiver, the plurality of received analog signals from the plurality of reception blocks are connected to the A / D converters (23, 24, 25, 26, 27) via the matrix switch (22). Is.

  The communication mode control unit (28) generates a reception block control signal (Rx_Blk_SS), a matrix switch control signal (MSW_CS), and an ADC control signal (ADC_CS) according to the received communication frequency band and the received signal frequency band. To do.

  Each of the plurality of reception blocks is switched ON / OFF by the reception block control signal.

  In the matrix switch (22), the connection path is switched by the matrix switch control signal.

  In the A / D converters (23, 24, 25, 26, 27), ON / OFF is switched by the ADC control signal.

  Each of the A / D converters operates with a sampling CLK having a different phase.

  Each of the A / D converters operates in a band narrower than the maximum RF reception signal bandwidth that can be received in a single communication frequency band. (See FIG. 2).

  In a specific embodiment, the receiver includes the plurality of reception blocks, the matrix switch (22), and the same number of A / D converters as the maximum number of RF reception signals received simultaneously for each receivable communication frequency band. And each of the plurality of receiving blocks has a direct down-conversion receiver architecture.

According to the embodiment, the following operation is performed in the receiver that performs communication in a specific communication frequency band.
When receiving an RF reception signal below the band of the A / D converter in a single or a plurality of communication frequency bands, the received analog signal below the band of the A / D converter passes through the matrix switch (22). One A / D converter.
On the other hand, when receiving an RF reception signal exceeding the band of the A / D converter in a single or a plurality of communication frequency bands, the received analog signal exceeding the band of the A / D converter passes the matrix switch (22). To two or more A / D converters. As a result, by synthesizing the received digital signals sampled by the sampling CLKs having different phases, it is possible to obtain a received digital signal corresponding to a received analog signal that is equal to or higher than the band of the A / D converter. That is, the operating frequency band of the A / D converter can be relaxed and the power consumption of the receiver can be reduced.

  In another specific embodiment, the receiver has a plurality of reception blocks (Rx_Blk-a2, b2, c2, d2, e2) for each receivable communication frequency band, a first matrix switch (30), A second matrix switch (31), a baseband variable gain amplifier (32, 33, 34) that is less than the maximum number of RF reception signals that are simultaneously received and that is at least half the maximum number of RF reception signals that are simultaneously received, and A / D conversion And (35, 36, 37), and at least two of the plurality of reception blocks have a Low-IF down-conversion receiver architecture.

  The plurality of Low-IF reception blocks are down-converted with Low-IF reception local signals having different phase differences.

  In the two Low-IF down-conversion receiving blocks, two received analog signals down-converted by Low-IF receiving local signals having different phase differences are shared via the first matrix switch (30). The output is input to a baseband variable gain amplifier (32, 33, 34), and the output is sent to the single or plural As depending on the signal frequency bandwidth of the combined received analog signal via the second matrix switch (31). / D converter (35, 36, 37).

  The receiver, with respect to the combined received digital signal that is output from the A / D converter (35, 36, 37), two Low signals each orthogonal to the phase of the two Low-IF reception local signals. A digital conversion unit (38) that separates into two received digital signals by multiplying the digital local signal for IF reception is further included (see FIG. 10).

  According to the embodiment, the following operation is performed in the receiver that performs communication in a specific communication frequency band.

When an RF reception signal that is equal to or higher than the band of the A / D converter (35, 36, 37) is received in a single communication frequency band, the single received analog signal that is equal to or higher than the band of the A / D converter is Two or more A / D conversions are connected to one baseband variable gain amplifier (32, 33, 34) through one matrix switch (30) and further through the second matrix switch (31). Input to the
When receiving an RF reception signal below the band of the A / D converter in a single communication frequency band, the single reception analog signal below the band of the A / D converter passes through the first matrix switch, Connected to one baseband variable gain amplifier, and further input to one A / D converter via the second matrix switch,
When receiving an RF reception signal equal to or higher than the band of the A / D converter in a plurality of communication frequency bands smaller than the number of baseband variable gain amplifiers, the received analog signal is equal to or higher than the band of the plurality of A / D converters. Are connected to different baseband variable gain amplifiers via the first matrix switch, and further input to two or more different A / D converters via the second matrix switch,
When receiving RF reception signals below the band of the A / D converter in a plurality of communication frequency bands smaller than the number of baseband variable gain amplifiers, received analog signals below the band of the plurality of A / D converters Are connected to different baseband variable gain amplifiers via the first matrix switch, and further input to different one of the A / D converters via the second matrix switch,
When receiving RF reception signals in a plurality of communication frequency bands larger than the number of baseband variable gain amplifiers, the received analog signals in the band of the plurality of A / D converters are received. Are connected to a common baseband variable gain amplifier two by two through the first matrix switch, and further input to two or more different A / D converters through the second matrix switch. The plurality of combined received digital signals are separated into two received digital signals by the digital conversion unit (38), respectively.
When receiving RF reception signals below the band of the A / D converter in a plurality of communication frequency bands larger than the number of baseband variable gain amplifiers, the received analog signals below the band of the plurality of A / D converters Are connected to a common baseband variable gain amplifier two by two through the first matrix switch, and further input to different one of the A / D converters through the second matrix switch, The plurality of combined received digital signals are separated into two received digital signals by the digital conversion unit. That is, the operating frequency band of the A / D converter can be relaxed with the configuration of the receiver, and the power consumption of the receiver can be reduced. Furthermore, the number of parts of the baseband variable gain amplifier and the A / D converter can be reduced.

  In a preferred embodiment, in the two Low-IF down-conversion reception blocks that generate the combined reception analog signal, the phase difference between the respective local signals for Low-IF reception is set as the origin on the coordinate axis. Selected.

  According to the preferred embodiment, in the signal separation processing in the digital conversion unit (38), it is possible to minimize the separation processing deterioration sensitivity due to the amplitude / phase error of the local signal for Low-IF reception. .

  In a most specific embodiment, the receiver is provided in an RFIC (Radio Frequency Integrated Circuits) for mobile phone terminals or an RF unit for mobile phone base stations.

<< Description of Embodiment >>
Next, the embodiment will be described in more detail. The best mode for carrying out the present invention will be described below in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the best mode for carrying out the invention, and the repetitive description thereof will be omitted.

A direct down-conversion receiver according to a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram showing an overall configuration of a direct down-conversion receiver that supports the IMT-A standard single band mode / frequency aggregation mode according to the first embodiment. FIG. 2 is a diagram showing details of a main part of the receiver shown in FIG.

  The receiver 1 converts an RF reception signal into a reception analog signal for each of a plurality of corresponding (N, here N = 5) communication frequency bands (band a to e), and a plurality (N) of reception blocks Rx_Blk (a E), a matrix switch MSW 22, a plurality (N) of A / D converters 23 to 27, a communication mode control unit 28, and a baseband processing unit 102. RF control signals received in a plurality (N) of communication frequency bands (band a to e) are converted into digital signals by the reception blocks Rx_Blk (a to e), the MSW 22, and the A / D converters 23 to 27. Is input to the baseband processing unit 102. The baseband processing unit demodulates the RF control signal, and from the information contained in the RF control signal, that is, the communication protocol of the incoming packet, the baseband that contains information about the communication frequency band and communication frequency band of the next signal to be received The control signal BB_CS is output to the communication mode control unit 28. The communication mode control unit 28 selects a reception block Rx_Blk (a to e) corresponding to one or more (M = 1 to N) communication frequencies to be communicated from the baseband control signal BB_CS. And a matrix switch control signal MSW_CS for selecting a connection path of the matrix switch MSW22 and an A / D converter control signal ADC_SS for switching ON / OFF of the A / D converters 23 to 27 are output. In the present embodiment, the frequency band fc of the received signal supported by each A / D converter 23 to 27 is 20 MHz. Hereinafter, regarding the communication mode, for simplicity, an RF module unit (Rx_Blk, MSW, A / D converter, and communication mode control unit) in which the baseband processing unit 102 of the receiver 1 is omitted is referred to as a receiver. This will be described as 1.

  As shown in FIG. 2, the receiver 1 receives a reception block Rx_Blk-a that converts an RF reception signal into a reception analog signal for each of the corresponding N communication frequency bands (band_a, b, c, d, e). Rx_Blk-b, Rx_Blk-c, Rx_Blk-d, and Rx_Blk-e.

  For example, band_a is a 3.5 GHz band, band_b is a 2.7 GHz band, band_c is a 2 GHz band, band_d is an 800 MHz band, and band_e is a communication frequency band of 700 MHz. Each of these N communication frequency bands A block Rx_Blk-a, a reception block Rx_Blk-b, a reception block Rx_Blk-c, a reception block Rx_Blk-d, and a reception block Rx_Blk-e correspond to each other.

  Each reception block Rx_Blk (a, b, c, d, e) includes low noise amplifiers (LNA) 2, 3, 4, 5, 6, mixers 7, 8, 9, 10, 11, and a local signal generator. (LO) 12, 13, 14, 15, 16 and baseband variable gain amplifiers (PGA) 17, 18, 19, 20, 21 are included.

Hereinafter, the operation of the receiver 1 in each communication mode will be described.
<< IMT-A communication mode >>
3A and 3B show communication frequency allocation in the IMT-A standard single band mode / frequency aggregation mode.

  In the base station 110, a data signal from a higher-level network or the like is subjected to signal processing in the baseband unit and converted into a signal conforming to the standard, converted from a digital signal to an analog signal by a D / A converter, and modulated into this analog signal. To convert the frequency to generate an RF signal. This RF signal is amplified and radiated as radio waves from the antenna. The user terminal extracts an analog signal from the RF signal received by the antenna, converts this analog signal into a digital signal by the ADC, and sends the signal to the baseband.

  In the IMT-A communication system, N multiple communication frequency bands are each subdivided into a wide band, for example, 100 MHz, into a plurality of reception signal frequency bands, and the number of users (U) used, in other words, RF reception that is received simultaneously. Depending on the number of signals, the bandwidth to be used varies depending on the situation, such as using the entire band or using only a part of the band. An arbitrary number (S) of multiple communication frequency bands, here, five communication frequency bands from 0.8 GHz band to 3.5 GHz band, where 1 to 5 communication frequency bands are set. To do.

  First, at the time of single band mode, as shown in FIG. 3A, the receiver (mobile phone terminal) 1A of one user A (U = 1) at the base station is set to a maximum of 100 MHz in a single communication frequency band (M = 1). RF reception signal frequency bands are assigned. For example, the user A is assigned a communication frequency band of 100 MHz in a communication frequency band of 3.5 GHz. That is, if the minimum received signal frequency band is 20 MHz, five communication frequency bands of 3.5 GHz are assigned (M = 1, S = 5). The user A of the receiver 1A can perform data communication with the base station 110 in the assigned single communication frequency band.

  On the other hand, in the frequency aggregation mode when a plurality of users (U) talk at the same time, a single user is assigned an RF reception signal frequency band of a maximum of 100 MHz across the multiple communication frequency bands. Since the minimum received signal frequency band is 20 MHz, one user can perform simultaneous communication in a maximum of five communication frequency bands. For example, as shown in FIG. 3B, a single user B at the base station is assigned an RF reception signal frequency band of 20 MHz across five multiple communication frequency bands from 0.8 GHz to 3.5 GHz. (M = 5, S = 5). User A is assigned a total of 5 bands of 60 MHz (3 bands) in the 3.5 GHz communication frequency band and 40 MHz (2 bands) in the 2.7 GHz communication frequency band (M = 2, S = 5). As described above, in the example of FIG. 3B, the mobile phone terminals 1 </ b> A and 1 </ b> B communicate with the mobile phone base station 110 by two persons in one or a plurality of communication frequency bands assigned to each other. A user (U = 2) performs data communication at the same time.

Strictly speaking, in broadband communication as a target of IMT-A communication, there is a difference in propagation speed of each communication frequency band between a base station and a terminal. Therefore, in the present invention, “simultaneously communicating data” or “receiving an RF reception signal simultaneously” means that a plurality of users talk or receive an RF reception signal in substantially the same time zone. Needless to say, it is not necessarily limited to simultaneous calls and simultaneous receptions at the same time.
<Receiver startup sequence>
The activation sequence of the receiver 1 will be described with reference to FIG. In the IMT-A communication mode, for example, the receiver is activated in the following sequence. The RF control signal received by band_a includes information on a communication frequency band and a communication frequency bandwidth of a signal to be received next. The RF control signal is converted into a digital signal by the reception block Rx_Blk_a, the MSW 22 and the ADC 23 and then input to the baseband processing unit 102. The baseband processing unit demodulates the RF control signal, and outputs a baseband control signal BB_CS including information on the communication frequency band and the communication frequency band of the signal to be received next to the communication mode control unit 28. The communication mode control unit 28 selects, from the baseband control signal BB_CS, a communication frequency band selection signal Rx_Blk_SS that selects a communication reception block, a matrix switch control signal MSW_CS that selects a connection path of the matrix switch, and an A / D converter ON. A / D converter control signal ADC_SS for switching / OFF is output.
<< Single-band mode: 100MHz >>
FIG. 4 shows the operation in the single band mode in which the single communication frequency band communication as shown in FIG. 3A, in this case, the receiver 1 performs the band_a, that is, the communication frequency band of 0.8 GHz band and the 100 MHz band communication. ing.

  At this time, the communication mode control unit 28 outputs a communication frequency band selection signal Rx_Blk_SS, and the reception block Rx_Blk-b, the reception block Rx_Blk-c, the reception block Rx_Blk-d, and the reception block Rx_Blk-e are in the sleep mode. .

The RF reception signal received by band_a is amplified by the low noise amplifier 2 in the reception block Rx_Blk-a, frequency-converted to the baseband frequency band by the mixer 7, and signal amplified by the baseband variable gain amplifier 17, and the matrix Input to the switch 22. At this time, the matrix switch 22 receives an output terminal of one reception block Rx_Blk-a and inputs of five A / D converters 23, 24, 25, 26, 27 according to a matrix switch control signal MSW_CS from the communication mode control unit 28. Terminals are connected to each other as indicated by broken arrows. Each A / D converter 23, 24, 25, 26, 27 is turned on by the A / D converter control signal ADC_SS from the communication mode control unit 28. The reception analog signal IF_1 from the reception block Rx_Blk-a is input to the ADCs 23, 24, 25, 26, and 27 in the 20 MHz band through the matrix switch 22, and the sampling CLKΦa, Φb, Φc, The received analog signal IF_1 is sampled by Φd and Φe, subjected to time interleaving processing, and demodulated as a received digital signal.
<< Frequency aggregation mode: 20 MHz x 5 >>
FIG. 5 shows a communication state that spans multiple communication frequency bands as shown in the example of user B in FIG. 3B, where the receiver 1 is band_a, band_b, band_c, band_d, band_e, that is, from 0.8 GHz band to 3.5 GHz. The operation in the frequency aggregation mode in which 20 MHz band communication is performed across the five multiple communication frequency bands up to the band is shown.

At this time, the reception block Rx_Blk-a, the reception block Rx_Blk-b, the reception block Rx_Blk-c, the reception block Rx_Blk-d, the reception analog signals IF_a, IF_b, IF_c, IF_d, and IF_e from the reception block Rx_Blk-e are matrix switches. As indicated by the dashed arrows, the signals are input to the A / D converters ADCa, ADCb, ADCc, ADCd, and ADCe through 22 and sampled, time interleaved, and demodulated as received digital signals.
<< Frequency aggregation mode: 60 MHz, 20 MHz, 20 MHz >>
FIG. 6 shows a communication state using one or a plurality of communication frequency bands as shown in the example of user A in FIG. 3B. Here, the receiver 1 is in band_a, that is, in the 0.8 GHz band. The operation in the frequency aggregation mode in which 20 MHz band communication is performed in each of 60 MHz, band_d, that is, 2.7 GHz band, and band_e, that is, 3.5 GHz band is shown.

  At this time, the reception block Rx_Blk-b and the reception block Rx_Blk-c enter the sleep mode by the communication frequency band selection signal Rx_Blk_SS.

  The reception analog signal IF_a from the reception block Rx_Blk-a is input to each of the A / D converters ADC_a, ADC_b, ADC_c through the matrix switch 22 as indicated by the dashed arrows, and each ADC has a different phase. Sampling is performed at CLKΦa, Φb, and Φc, time-interleaved, and demodulated. On the other hand, the reception analog signals IF_d and IF_e from the reception block Rx_Blk-d and the reception block Rx_Blk-e are input to the A / D converters ADCd and ADCe through the matrix switch 22 as indicated by the broken arrows, respectively. Sampled individually.

  In the direct conversion receiver of FIG. 2, in the IMT-A standard maximum 100 MHz band single band mode / frequency aggregation mode, the maximum operating frequency band of the A / D converter can be limited to 20 MHz, and low power consumption is possible.

  As described above, according to the present embodiment, in the receiver capable of simultaneous communication in a single or a plurality of communication frequency bands, the operating frequency band of the A / D converter is relaxed and the power consumption of the receiver is reduced. Can do.

Next, a band superposition type Low-IF receiver according to a second embodiment of the present invention will be described with reference to FIGS. 7A to 9.
FIG. 7A is a diagram illustrating a configuration example of a Low-IF down-conversion receiver unit in a direct / Low-IF down-conversion receiver that supports the IMT-A standard single band mode / frequency aggregation mode according to the second embodiment. It is. FIG. 7B is an operation explanatory diagram of the receiver unit shown in FIG. 7A.

  The receiver 39 in FIG. 7A corresponds to two communication frequency bands of 2 GHz band and 3, 5 GHz band, and the reception block has a Low-IF down-conversion receiver architecture. That is, for each communication band, low noise amplifiers 40 and 41, image rejection mixers 42 and 43, and LO signal generators 44 and 45 are included. The receiver 39 further includes analog baseband filters 52 and 53, analog baseband variable gain amplifiers 54 and 55, A / D converters 56 and 57, digital filters 58 and 59, and a digital conversion unit 38. The 2 GHz band LO signal generation unit 44 includes a 4 GHz band voltage controlled oscillator 46, a PLL circuit 47, and a frequency divider 48 for receiving a pair of 2 GHz band reception signals output from the 2 GHz band LO signal generation unit 44. The I / Q phase of the local signal LO1 is set to θi1 and θq1. On the other hand, the 3.5 GHz band LO signal generation unit 45 includes a 7 GHz band voltage controlled oscillator 49, a PLL circuit 50, and a frequency divider 51, and is output from the 3.5 GHz band LO signal generation unit 49. The I / Q phase of the pair of 3.5 GHz band reception local signals LO2 is set to θi2 and θq2. The digital conversion unit 38 includes digital multipliers 60 to 67 and digital adder / subtracters 68 to 71.

  The receiver 39 in FIG. 7A also supports simultaneous communication in the single band mode and the frequency aggregation mode. That is, when an RF reception signal of 20 MHz band is input to each of the two communication frequency bands, the two RF reception signals from the LNAs 40 and 41 are obtained by the image rejection mixers 42 and 43 as shown in FIG. 7B. Down-converted to the same intermediate frequency band (10 MHz).

  The outputs of the image rejection mixers 42 and 43 are synthesized for each I / Q, and the A / D converter 56 is passed through the common analog baseband filters 52 and 53 and the analog baseband variable gain amplifiers 54 and 55. , 57 are sampled. That is, the analog baseband filters 52 and 53, the analog baseband variable gain amplifiers 54 and 55, the A / D converters 56 and 57, and the digital filters 58 and 59 are made common to the two communication frequency bands. ing.

The combined received digital signals BI and BQ are input to the digital conversion unit 38 after the interference filters are removed by the digital filters 58 and 59.
The digital conversion unit 38 separates the I / Q signals I1 and Q1 received in the 2 GHz band from the I / Q signals I2 and Q2 received in the 3,5 GHz band.

FIG. 8 shows a process of extracting only the I / Q signals I1 and Q1 from the combined received digital signals BI and BQ.
That is, in the digital multipliers 60, 61, 62, and 63 of the digital conversion unit 38, the combined reception digital signals BI and BQ shown in (A) are converted into the 3.5 GHz band reception local signal LO2 shown in (B). By multiplying by digital local signals DLO_1, DLO_2, DLO_3, and DLO_4 having phases orthogonal to the I / Q phases θi2 and θq2, and performing addition and subtraction, as shown in (C), a digital signal that does not include I2 and Q2 components Da and Db can be obtained.

  If the LNA outputs of the 2G band and the 3.5G band are expressed by equation (1), the digital signals Da and Db are expressed by equation (2).

  In the equation (2), when θq1 ≠ θq2, each equation becomes independent and I1 and Q1 can be calculated. Similarly, in the digital multipliers 64, 65, 66, and 67, the combined received digital signals BI and BQ are converted into digital local signals DLO_5 and DLO_6 having phases orthogonal to the I / Q phases θi1 and θq1 of the local signal LO1 for 2 GHz band reception. , DLO_7, DLO_8, and addition / subtraction can be performed to extract the I2 and Q2 components from the combined received digital signals BI and BQ.

  In the second embodiment, as in the case of the first embodiment, each ADC and digital conversion unit is sampled by sampling CLK having different phases, subjected to time interleave processing, and demodulated.

The receiver 39 of FIG. 7A shares the analog baseband filters 52 and 53, the analog baseband variable gain amplifiers 54 and 55, and the A / D converters 56 and 57 at the time of simultaneous communication in two communication frequency bands. It is possible to reduce the number of parts of the receiver.
<< Signal separation compensation by local signal error of digital conversion unit >>
FIG. 9 is a diagram summarizing the signal separation accuracy in the digital conversion unit when I / Q amplitude / phase errors are given to the reception local signal of the receiver 39 of FIG. 7A. The signal separation accuracy BIRR is the power ratio of I2 and Q2 included in the outputs I1 and Q1 of the digital conversion unit 39. In the receiver 39 of FIG. 7A, the I / Q phases of the local signals for reception LO1 and LO2 are selected based on the following equation (3).

  For example, if θ1 = θi1−θq1 is 90 °, θi2−θq2 is 270 ° from equation (3). If θ1 = θi1−θq1 is 120 °, θi2−θq2 is 300 ° from the equation (3). The solid line in FIG. 9 represents θ1 = 90 °, and the broken line represents the signal separation accuracy characteristics of the signal separation processing when θ1 = 120 °. As a result, it is possible to ensure signal separation compensation tolerance against variations in the reception local signals LO1 and LO2.

  According to the present embodiment, in a receiver that can communicate simultaneously in a single or a plurality of communication frequency bands, the operating frequency band of the A / D converter can be relaxed, and the power consumption of the receiver can be reduced.

Next, a direct / Low-IF down-conversion receiver according to a third embodiment of the present invention will be described with reference to FIGS.
FIG. 10 is a diagram illustrating a configuration example of a direct / Low-IF down-conversion receiver corresponding to the IMT-A standard single band mode / frequency aggregation mode according to the third embodiment.

  10 receives reception blocks Rx_Blk-a2, Rx_Blk-b2, and Rx_Blk-c2 for converting an RF reception signal into a reception analog signal for each corresponding communication frequency band (band_a, b, c, d, e). , Rx_Blk-d2, and Rx_Blk-e2. Each of these reception blocks Rx_Blk-a2 to e2 includes low noise amplifiers 2, 3, 4, 5, 6, mixers 7, 8, 9, 10, 11, and LO signal generation units 12, 13, 14, 15, 16 respectively. Among the plurality of reception blocks, at least two reception blocks have a Low-IF down-conversion receiver architecture. For example, the functions of the reception blocks Rx_Blk-b2 to e2 are the same as the functions of the low noise amplifier, the image rejection mixer, and the LO signal generation unit for each communication band of the receiver 39 illustrated in FIG. 7A. The receiver includes a first matrix switch (MSWa) 30, a second matrix switch (MSWb) 31, baseband variable gain amplifiers (PGA) 32, 33, 34, and A / D converters (a, c, e) 35, 36, and 37 and the communication mode control unit 28 are included. A digital conversion unit having the same configuration and function as the digital conversion unit 38 of the receiver 39 shown in FIG. 7A is connected to the subsequent stage of the A / D converters (a, c, e) 35, 36, and 37. Has been. In the following description, illustration of the digital conversion unit 38 is omitted.

  In FIG. 10, for example, band_a, band_b, band_c, band_d, and band_e are communication frequency bands of 3.5 GHz band, 2.7 GHz band, 2 GHz band, 800 MHz band, and 700 MHz band, and receive block Rx_Blk-a2 and receive block Rx_Blk. -B2, reception block Rx_Blk-c2, reception block Rx_Blk-d2, and reception block Rx_Blk-e2 correspond to each other.

Hereinafter, the operation of the receiver 72 in each communication mode of the IMT-A standard as shown in FIGS. 3A and 3B will be described with respect to the receiver 72 of FIG.
<< Single-band mode: 100MHz >>
FIG. 11 shows an operation in the single band mode in which the receiver 72 of FIG. 10 performs 100 MHz band communication with band_a.
At this time, a communication frequency band selection signal Rx_Blk_SS is output from the communication mode control unit 28, and the reception block Rx_Blk-b2, the reception block Rx_Blk-c2, the reception block Rx_Blk-d2, and the reception block Rx_Blk-e2 are in the sleep mode.

The RF reception signal received by the band_a is amplified by the low noise amplifier 2 in the reception block Rx_Blk-a2, is frequency-converted to the baseband frequency band by the mixer 7, and the frequency-converted reception analog signal is the first matrix switch. 30. At this time, the reception block Rx_Blk-a2 operates in the direct down conversion mode. In the first matrix switch 30, the output terminal of the reception block Rx_Blk-a2 is connected to the baseband variable gain amplifier 32 as indicated by the dashed arrow by the first matrix switch control signal MSW_CSa from the communication mode control unit 28. The The output of the baseband variable gain amplifier 32 is input to the A / D converters 35, 36, and 37 in the 40 MHz band through the second matrix switch MSWb, as indicated by the dashed arrows, and each ADC has a different phase. Sampling is performed at the sampling CLKΦa, Φc, and Φe, time interleaved, and demodulated.
<< Frequency aggregation mode: 20 MHz x 5 >>
FIG. 12 illustrates an operation in the frequency aggregation mode in which the receiver 72 of FIG. 10 performs 20 MHz band communication with each of band_a, band_b, band_c, band_d, and band_e.
At this time, the reception block Rx_Blk-a2 operates in the direct down-conversion mode, and is connected to the baseband variable gain amplifier 32 through the first matrix switch 30 as indicated by the dashed arrow, and the reception analog signal that is the output thereof IF_a is input to ADCa 35 via the second matrix switch 31 and sampled.

  The reception block Rx_Blk-b2 and the reception block Rx_Blk-c2 each operate in the Low-IF down-conversion mode as described in FIG. 7B, and through the first matrix switch 30, a common base is indicated as indicated by a dashed arrow. The combined reception analog signal IF_c, which is output from the band variable gain amplifier 33, is input to the ADCc 36 via the second matrix switch, sampled, and then subjected to signal separation processing by the digital conversion unit.

Similarly, the reception block Rx_Blk-d2 and the reception block Rx_Blk-e2 operate in the Low-IF down-conversion mode, and are connected to the common baseband variable gain amplifier 34 via the first matrix switch 30 as indicated by the dashed arrow. The combined reception analog signal IF_e, which is connected, is input to the ADCe 37 via the second matrix switch, sampled, and then subjected to signal separation processing by the digital conversion unit. As described above, each ADC and digital conversion unit performs sampling with the sampling CLKΦa, Φc, and Φe having different phases, time interleave processing, and demodulation.
<< Frequency aggregation mode: 60 MHz, 20 MHz, 20 MHz >>
FIG. 13 shows an operation in the frequency aggregation mode in which the receiver 72 of FIG. 10 performs 20 MHz band communication with 60 MHz, band_d, and band_e in band_a.
At this time, the reception block Rx_Blk-b and the reception block Rx_Blk-c enter the sleep mode by the communication frequency band selection signal Rx_Blk_SS.

  The reception block Rx_Blk-a operates in the direct down-conversion mode, and the reception analog signal IF_a output via the second matrix switch 30 and the baseband variable gain amplifier 32 is converted into an A / D converter ADCa35 via the second matrix switch. , ADCc 36, and each ADC is sampled by sampling CLKΦa, Φc having different phases, time-interleaved, and demodulated.

  On the other hand, the reception block Rx_Blk-d and the reception block Rx_Blk-e operate in the Low-IF down-conversion mode, and are connected to the common baseband variable gain amplifier 34 via the first matrix switch 30 and the output is the synthesis. The received analog signal IF_e is input to the ADCe 37 via the second matrix switch, sampled, and then subjected to signal separation processing by the digital conversion unit. That is, in each ADC and digital conversion unit, sampling is performed with sampling CLKΦa, Φc, and Φe having different phases, time interleaving processing is performed, and demodulation is performed.

  As described above, the direct / Low-IF down-conversion receiver 72 of FIG. 10 can limit the maximum operating frequency band of the A / D converter to 40 MHz in the IMT-A standard maximum 100 MHz band single band mode / frequency aggregation mode. Lower power consumption is possible. Further, by sharing a part of the baseband variable gain amplifier and the A / D converter, it is advantageous in reducing the number of parts of the receiver.

Next, a direct down-conversion receiver having a transmission gate type matrix switch according to a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 14 is a diagram illustrating a direct down-conversion receiver corresponding to two communication frequency bands according to the fourth embodiment of the present invention.
The receiver 73 of FIG. 14 includes reception blocks Rx_Blk1 and Rx_Blk2 that convert the RF reception signal into a reception analog signal for each corresponding communication frequency band (band_a, b). The receiver includes a matrix switch 74 and A / D converters 75 and 76.
The matrix switch 74 includes four transmission gates 77, 78, 79, and 80. These transmission gates are controlled by a communication mode control unit (not shown). Switch between conduction / disconnection. In the ADCs 75 and 76, sampling is performed with sampling CLKΦa and Φb having different phases, and time interleave processing is performed and demodulation is performed. According to the present embodiment, in a receiver that can communicate simultaneously in a single or a plurality of communication frequency bands, the operating frequency band of the A / D converter can be relaxed, and the power consumption of the receiver can be reduced.

Next, a transmission / reception unit including a communication transmission / reception circuit compatible with IMT-A according to a fifth embodiment of the present invention will be described with reference to FIG.
FIG. 15 is a diagram illustrating a direct down-conversion transmission / reception unit 81 corresponding to IMT-A according to the fifth embodiment of the present invention. The transmission / reception unit 81 includes a transmitter unit (TX_U) 82, a receiver unit (RX_U) 83, and a baseband processing unit (not shown). Both the transmitter unit and the receiver unit are capable of performing multiple communication. It corresponds to five communication frequency bands of frequency bands, here, 3, 5 GHz band, 2.7 GHz band, 2 GHz band, 800 MHz band, and 700 MHz band.
The receiver unit (RX_U) 83 is a direct down-conversion receiver that supports multiple communication frequency bands. The low-noise amplifier 2, the mixer 7, and the voltage control respectively correspond to five communication frequency bands. An oscillator 46, an RFPLL circuit 47, a frequency divider 48, an analog baseband filter 52, a baseband variable gain amplifier 54, a matrix switch 84, I / Q ADCs 85, 86, 87, 88, 89, and A communication mode control unit (not shown) is provided.
The receiver unit 83 corresponds to each communication mode of the IMT-A standard using multiple communication frequency bands, as in the above-described embodiment, and receives analog baseband I / Q obtained by down-converting the RF reception signal. The signals IF_I / Qa, IF_I / Qb, IF_I / Qc, IF_I / Qad, and IF_I / Qe are sent to a single or a plurality of I / Q ADCs 85, 86, 87, 88, via the matrix switch 84, depending on the respective signal frequency bands. 89. Based on the control of the communication mode control unit, each of the ADCs 85 to 89 performs sampling with sampling CLKs having different phases and performs time interleaving processing. Each received digital baseband I / Q signal of the I / QADC output is output to the baseband processing unit via the reception interface (RX_INT) 90. The transmission / reception unit 81 also has the function and effect of transmission / reception using multiple communication frequency bands, similar to the receiver unit in the embodiment described above.

Next, a configuration example of a mobile phone terminal according to the sixth embodiment of the present invention will be described with reference to FIG.
FIG. 16 is a block diagram showing the configuration of a mobile phone according to the sixth embodiment of the present invention. This cellular phone includes an RFIC 91 in which the transmission / reception unit 81 described in FIG. 15 is integrated in the same semiconductor integrated circuit, an RF module 95 incorporating an antenna switch MMIC 92, a duplexer 93, and an RF power amplifier 94, a baseband signal processing LSI 96, It is equipped with. MMIC is an abbreviation for Microwave Monolithic IC.

  In FIG. 16, a common input / output terminal I / O of the antenna switch MMIC 92 of the RF module 95 is connected to the transmitting / receiving antenna ANT97 of the mobile phone. Control signals B and B_Cnt from the baseband signal processing LSI 96 are supplied to the controller integrated circuit 98 of the antenna switch MMIC 92 via the RF_IC 91. The flow of the RF signal from the transmission / reception antenna ANT97 to the common input / output terminal I / O becomes the reception operation RX of the mobile phone, and the flow of the RF signal from the common input / output terminal I / O to the transmission / reception antenna ANT97 is the mobile phone. The transmission operation TX is performed.

  The RFIC 91 performs frequency up-conversion of the transmission digital baseband signals TxDBI and TxDBQ from the baseband signal processing LSI 96 to an RF transmission signal. Conversely, the RFIC 91 frequency-converts the RF reception signal received by the transmission / reception antenna ANT97 into the received digital baseband signals RxDBI and RxDBQ, and supplies them to the baseband signal processing LSI 96.

  The antenna switch MMIC 92 of the RF module 95 establishes a signal path between the common input / output terminal I / O and the transmission / reception terminals TRx1, TRx2, TRx3, TRx4, TRx5, or a single terminal or a plurality of terminals, thereby receiving operation RX. And the transmission operation TX.

  The baseband signal processing LSI (BB_LSI) 96 is connected to an external nonvolatile memory (not shown) of the mobile phone and an application processor (not shown). The application processor is connected to a liquid crystal display device (not shown) and a key input device (not shown) of the mobile phone, and can execute various application programs including general-purpose programs and games.

  Phase amplitude demodulation of IMT-A received baseband signals by a boot program (startup initialization program), an operating system program (OS), and a digital signal processor (DSP) inside the baseband signal processing LSI of a mobile device such as a cellular phone The program for phase amplitude modulation related to the transmission baseband signal and various application programs can be stored in the external nonvolatile memory.

  According to the present embodiment, in a mobile phone that can simultaneously communicate in a single or a plurality of communication frequency bands, the operating frequency band of the A / D converter can be relaxed, and the power consumption of the mobile phone can be reduced.

Next, a configuration example of a mobile phone base station according to the seventh embodiment of the present invention will be described with reference to FIG. FIG. 17 is a block diagram showing a configuration of a mobile phone base station according to the seventh embodiment. The mobile phone base station includes a baseband signal processing LSI 96, an RF module 98, and an antenna module 101. The RF module 98 is composed of an RF unit 99 and a plurality of RF power amplifiers 94 each having a function corresponding to each band of the multiple communication frequency bands, which includes the transmission / reception unit 81 described with reference to FIG. The antenna module 101 includes a plurality of antennas 97, a plurality of duplexers 93, and a plurality of low noise amplifiers 100 for corresponding to each band of the multiple communication frequency bands.
In the example of FIG. 17, an antenna 97 is provided for each communication frequency band, and each RF reception signal is processed by an individual transceiver for each band. The transmission / reception unit 81 also has a transmission / reception function using multiple communication frequency bands, similar to the receiver unit in the embodiment described above. According to the present embodiment, in a base station that can simultaneously communicate in a single or a plurality of communication frequency bands, the operating frequency band of the A / D converter can be relaxed, and the power consumption of the base station can be reduced.

  As mentioned above, although the invention made by the present inventor has been specifically described based on the embodiment, it is needless to say that the present invention is not limited thereto and can be variously modified without departing from the gist thereof.

  For example, in the mobile phone shown in FIG. 16, the communication RFIC and the baseband signal processing LSI are configured by different semiconductor chips, but in another embodiment, they are integrated into one semiconductor chip. Can be a chip.

1 receiver 2, 3, 4, 5, 6 low noise amplifier,
7, 8, 9, 10, 11 Mixer 12, 13, 14, 15, 16 Local signal generator,
17, 18, 19, 20, 21 Baseband variable gain amplifier,
22 matrix switch,
23, 24, 25, 26, 27 A / D converter,
28 communication mode control unit,
30, 31 matrix switch,
32, 33, 34 Baseband variable gain amplifier,
35, 36, 37 A / D converter,
38 Digital conversion unit,
39 Receiver,
40, 41 Low noise amplifier,
42, 43 Image rejection mixer,
44, 45 Local signal generator,
46, 49 Voltage controlled oscillator,
47, 50 PLL circuit,
48, 512 divider,
52, 53 Analog baseband filter,
54, 55 Baseband variable gain amplifier,
56, 57 A / D converter,
58, 59 digital baseband filter,
60, 61, 62, 63, 64, 65, 66, 67 Digital multiplier,
68, 69, 70, 71 Digital adder / subtractor,
72 receivers,
73 receiver,
74 Matrix switch,
75, 76 A / D converter,
77, 78, 79, 80 Transmission gate,
81 transceiver unit,
82 transmission units,
83 receiving units,
84 matrix switch,
85, 86, 87, 88, 89 A / D converter,
90 receiving digital interface,
91 RFIC,
92 Antenna switch MMIC,
93 Duplexer,
94 power amplifier,
96 Baseband signal processing LSI,
97 antenna,
98 controller integrated circuit,
99 RF unit,
100 Tower Mounted Amplifier,
101 antenna module,
102 baseband processing unit,
110 Base station.

Claims (20)

A receiver that receives a plurality of (N) communication frequency bands and receives an RF reception signal that is configured across a single or plural (M = 1 to N) communication frequency bands within the plurality of communication frequency bands. There,
The receiver
A plurality (N) of receiving blocks corresponding to each of the communication frequency bands;
At least one matrix switch to which the output of each receiving block is input;
At least two A / D converters connected to the matrix switch;
A communication mode control unit for controlling the reception block, the matrix switch, and the A / D converter;
Each of the plurality of reception blocks includes a reception demodulator and a reception local signal generation unit, and the reception demodulator receives an RF reception signal by a reception local signal supplied from the reception local signal generation unit. Has the function of down-converting to a received analog signal,
The communication mode control unit selects the reception block corresponding to the single or a plurality of communication frequency bands based on information on the configuration of the RF reception signal, and the selected reception block and the A / D conversion A receiver for controlling the matrix switch so as to form a connection path with the device. In claim 1,
Each of the plurality of A / D converters operates in a frequency band narrower than a maximum RF received signal frequency bandwidth that can be received in a single or a plurality of communication frequency bands. In claim 2,
The plurality of A / D converters have a time interleave processing function. In claim 2,
In each of the plurality of A / D converters, when one received analog signal is input to at least two or more A / D converters via the matrix switch, the A / D converters Operates with sampling CLK of different phases. In claim 1,
The information regarding the configuration of the RF reception signal is information regarding the number of the RF reception signals received simultaneously and the reception signal frequency bandwidth of each of the RF reception signals. In claim 2,
Each of the plurality of receiving blocks has a direct down-conversion receiver architecture. In claim 2,
The receiver characterized in that at least two of the plurality of reception blocks have a Low-IF down-conversion receiver architecture. In claim 2,
The receiver
A plurality of the reception blocks corresponding to each of the receivable communication frequency bands, and the one matrix switch for connecting the plurality of A / D converters,
The number of the A / D converters is the same as the maximum number of the RF reception signals received simultaneously. In claim 2,
The receiver
The reception block for each communication frequency band that can be received;
One of the matrix switches;
Including the same number of A / D converters as the maximum number of RF reception signals received simultaneously,
The communication mode control unit is configured to receive an analog signal received above the band when the receiver receives an RF reception signal that is equal to or higher than the band of the A / D converter in a single or a plurality of communication frequency bands. The receiver inputs to two or more A / D converters via the matrix switch. In claim 2,
The receiver
The reception block for each communication frequency band that can be received;
One of the matrix switches;
Including the same number of A / D converters as the maximum number of RF reception signals received simultaneously,
The communication mode control unit receives an analog signal received below the band when an operation mode of the receiver receives an RF reception signal below the band of the A / D converter in a single or a plurality of communication frequency bands. The receiver inputs to each of the A / D converters via the matrix switch. In claim 1,
The receiver includes a baseband processing unit,
In the baseband processing unit, as information regarding the configuration of the RF reception signal, a baseband including information on a communication frequency band and a communication frequency band of a signal to be received next from information included in the RF reception signal A receiver that generates a control signal and outputs the control signal to the communication mode control unit. In claim 1,
The receiver
The plurality of reception blocks for each receivable communication frequency band,
A plurality of baseband variable gain amplifiers that are less than the maximum number of RF reception signals that are received simultaneously and that are at least half the number of maximum RF reception signals that are received simultaneously;
A plurality of the A / D converters,
The matrix switch includes a first matrix switch that connects the reception block and the baseband variable gain amplifier, and a second matrix switch that connects the baseband variable gain amplifier and the A / D converter. ,
Of the plurality of reception blocks, at least two of the reception blocks have a Low-IF down-conversion receiver architecture,
The communication mode control unit
A plurality of received analog signals from the plurality of receiving blocks are input to the baseband variable gain amplifier via the first matrix switch, and an output of the baseband variable gain amplifier is input to the baseband variable gain amplifier via the second matrix switch. Input to multiple A / D converters
Switching connection paths to the plurality of baseband variable gain amplifiers in the first matrix switch according to the number of RF reception signals received simultaneously,
A receiver that switches connection paths to the plurality of A / D converters in the second matrix switch in accordance with a signal frequency bandwidth of the received analog signal. In claim 12,
Each of the plurality of Low-IF down-conversion receiving blocks includes a local signal generator for receiving Low-IF,
The plurality of Low-IF reception local signal generators generate Low-IF reception local signals having different phase differences. In claim 13,
In the two Low-IF down-conversion receiving blocks, the two received analog signals down-converted by the Low-IF receiving local signals having different phase differences are transmitted through the first matrix switch to the common baseband. Input to the variable gain amplifier,
The combined reception analog signal output from the baseband variable gain amplifier is input to the single or plural A / D converters via the second matrix switch according to the signal frequency bandwidth of the combined reception analog signal. And
The receiver further includes:
The composite received digital signal is separated into two received digital signals by multiplying the two low-IF received digital local signals orthogonal to the phase of the two low-IF received local signals, respectively. A receiver comprising a digital conversion unit. In claim 14,
In the two Low-IF down-conversion reception blocks that generate the combined reception analog signal, the phase difference between the local signals for receiving the Low-IF is selected so as to be the origin target on the coordinate axis. Receiver. In claim 15,
Under the control of the communication mode control unit,
When receiving an RF reception signal that exceeds the band of the A / D converter in a single communication frequency band, the single reception analog signal that exceeds the band of the A / D converter passes through the first matrix switch. , Connected to one of the baseband variable gain amplifiers, and further input to two or more A / D converters via the second matrix switch,
When receiving an RF reception signal below the band of the A / D converter in a single communication frequency band, the single reception analog signal below the band of the A / D converter is passed through the first matrix switch. , Connected to one of the baseband variable gain amplifiers, and further input to one of the A / D converters via the second matrix switch,
When receiving an RF reception signal equal to or higher than the band of the A / D converter in a plurality of communication frequency bands smaller than the number of the baseband variable gain amplifiers, the plurality of reception analogs equal to or higher than the band of the A / D converter The signals are connected to different baseband variable gain amplifiers via the first matrix switch, and further input to two or more different A / D converters via the second matrix switch,
When receiving RF reception signals below the band of the A / D converter in a plurality of communication frequency bands smaller than the number of the baseband variable gain amplifiers, the plurality of reception analogs below the band of the A / D converter The signals are connected to the different baseband variable gain amplifiers via the first matrix switch, and further input to the different A / D converters via the second matrix switch,
When receiving an RF reception signal that is greater than or equal to the band of the A / D converter in a plurality of communication frequency bands greater than the number of the baseband variable gain amplifiers, the plurality of received analogs that are greater than or equal to the band of the A / D converter A signal is connected to the common baseband variable gain amplifier two by two through the first matrix switch, and further to two or more different A / D converters through the second matrix switch. And the plurality of combined received digital signals are connected to the digital conversion unit and separated into two received digital signals,
When receiving RF reception signals below the band of the A / D converter in a plurality of communication frequency bands larger than the number of the baseband variable gain amplifiers, reception below the band of the plurality of A / D converters The analog signals are connected to the common baseband variable gain amplifier two by two through the first matrix switch, and are further input to different one A / D converters through the second matrix switch. And the plurality of combined received digital signals are separated into two received digital signals by a digital conversion unit. A transmission / reception unit comprising a transmission unit and a reception unit,
The transmission / reception unit corresponds to a plurality of (N) communication frequency bands, and receives an RF reception signal configured across a single or plural (M = 1 to N) communication frequency bands within the plurality of communication frequency bands. It has a receiver to receive,
The receiver
A plurality (N) of receiving blocks corresponding to each of the communication frequency bands;
At least one matrix switch to which the output of each receiving block is input;
At least two A / D converters connected to the matrix switch;
A communication mode control unit for controlling the reception block, the matrix switch, and the A / D converter;
Each of the plurality of reception blocks includes a reception demodulator and a reception local signal generation unit, and the reception demodulator receives an RF reception signal by a reception local signal supplied from the reception local signal generation unit. Has the function of down-converting to a received analog signal,
The plurality of A / D converters have a time interleave processing function,
The communication mode control unit selects the reception block corresponding to the single or a plurality of communication frequency bands based on information on the configuration of the RF reception signal, and the selected reception block and the A / D conversion A transmission / reception unit that performs control to switch the matrix switch so as to form a connection path with a device. In claim 17,
Each of the plurality of A / D converters operates in a frequency band narrower than a maximum RF received signal frequency bandwidth that can be received in a single or a plurality of communication frequency bands. In claim 17,
The transmission / reception unit, wherein at least two reception blocks of the plurality of reception blocks have a Low-IF down-conversion receiver architecture. A base station comprising a baseband signal processing LSI, an RF module, and an antenna module 1,
The RF module includes a RF unit having a function corresponding to each band of a multi-communication frequency band in which a transmission / reception unit is composed of discrete components, and a plurality of RF power amplifiers,
The antenna module includes a plurality of antennas, a plurality of duplexers, and a plurality of low noise amplifiers for supporting each band of the multiple communication frequency band,
The transmission / reception unit includes a transmission unit and a reception unit,
The transmission / reception unit corresponds to a plurality of (N) communication frequency bands, and receives an RF reception signal configured across a single or plural (M = 1 to N) communication frequency bands within the plurality of communication frequency bands. It has a receiver to receive,
The receiver
A plurality (N) of receiving blocks corresponding to each of the communication frequency bands;
At least one matrix switch to which the output of each receiving block is input;
At least two A / D converters connected to the matrix switch;
A communication mode control unit for controlling the reception block, the matrix switch, and the A / D converter;
Each of the plurality of reception blocks includes a reception demodulator and a reception local signal generation unit, and the reception demodulator receives an RF reception signal by a reception local signal supplied from the reception local signal generation unit. Has the function of down-converting to a received analog signal,
The plurality of A / D converters have a time interleave processing function,
The communication mode control unit selects the reception block corresponding to the single or a plurality of communication frequency bands based on information on the configuration of the RF reception signal, and the selected reception block and the A / D conversion A base station that performs control to switch the matrix switch so as to form a connection path with a device.

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