JP2009060174A - Radio device, radio circuit, and radio circuit control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the amplitude errors between a received I signal and a received Q signal at all times, without causing the circuit scale to enlarge, regardless of the variations in supply voltage and the temperature. <P>SOLUTION: A switch 11 and switches 12a and 12b switching connections, and a quadrature modulator 210 uses a local oscillation signal, output from a local oscillation signal generator 131 for reception, to perform quadrature modulation processing on a test signal, and the test signal, after the quadrature modulation processing is input to a quadrature demodulator 230; and the quadrature demodulator 230 performs quadrature demodulation processing on the test signal to generate received I/Q signals; the generated received I/Q signals are input to a correction value calculation control part 240; and the correction value calculation control part 240 updates a correction value stored in a storage part 160, to a correction value such that the amplitude of the I signal received and that of the Q signal received are equal to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radio apparatus, a radio circuit, and a radio circuit control method for correcting an amplitude error between a received I signal and a received Q signal, and in particular, even if there is a fluctuation in power supply voltage or temperature without increasing the circuit scale. The present invention relates to a radio apparatus, a radio circuit, and a radio circuit control method that can always reduce an amplitude error between a received I signal and a received Q signal and obtain good EVM characteristics.

  In recent years, in the field of wireless communication systems, improvement in demodulation accuracy (EVM: Error Vector Magnitude) in wireless devices has been demanded as transmission rates have increased. One factor that degrades the EVM is an amplitude error between the received I signal and the received Q signal.

  It is known that the amplitude error between the received I signal and the received Q signal varies by about 1 dB due to variations in power supply voltage and temperature. The higher the transmission rate, the greater the influence of the amplitude error on the amount of EVM degradation. For this reason, recent wireless devices are required to reduce the amplitude error between the received I signal and the received Q signal, in particular, in order to improve EVM.

  Therefore, Patent Document 1 discloses a technique for performing an inspection using a local oscillator and a self-diagnosis circuit provided in a wireless device. If the technique disclosed in Patent Document 1 is used, it is not necessary to use an external device for inspection, so that it is possible to perform an inspection of the amplitude error between the reception I signal and the reception Q signal of the wireless device at a low cost. .

  Patent Document 2 discloses a technique for storing error data for each temperature and each frequency in order to cope with changes in power supply voltage and temperature. According to the technique disclosed in Patent Document 2, it is possible to correct the amplitude error between the received I signal and the received Q signal using highly accurate error data.

JP 2004-36392 A JP-A-8-307465

  However, although the technique disclosed in Patent Document 1 can reduce the inspection cost, there is a problem in that it cannot cope with an amplitude error that varies depending on the power supply voltage and temperature during operation. In addition, the technique disclosed in Patent Document 1 has a problem that when a signal having the same frequency is input to the mixer circuit, a DC component is output as a difference between them, so that a baseband signal cannot be obtained. .

  Further, although the technique disclosed in Patent Document 2 can cope with changes in power supply voltage and temperature, a problem that an external device is required as a test signal source and error data are stored for each temperature and each frequency. Therefore, a large amount of memory is required to increase the circuit scale.

  The present invention has been made in order to solve the above-described problems caused by the prior art, and without increasing the circuit scale, the received I signal and the received Q signal are always changed even if the power supply voltage or temperature fluctuates. An object of the present invention is to provide a radio apparatus, a radio circuit, and a radio circuit control method capable of reducing amplitude error and obtaining good EVM characteristics.

  In order to solve the above-described problems and achieve the object, in one aspect of the present invention, orthogonal modulation processing is performed using an antenna that receives a signal from the outside and a signal that is output from a transmitting local signal generator. A quadrature modulator, a quadrature demodulator that performs quadrature demodulation processing of the antenna reception signal received via the antenna, using the signal output from the local signal generator for reception, and the antenna reception signal subjected to quadrature demodulation by the quadrature demodulator A storage unit that stores a correction value for correcting an amplitude error between the I signal and the Q signal generated by processing, and an amplitude error between the I signal and the Q signal using the correction value stored in the storage unit A local oscillation signal generator used by the quadrature modulator is provided in either the transmission local oscillation signal generator or the reception local oscillation signal generator. Switch to be First switching means (corresponding to “switch 11” in the first and second embodiments) and a signal input to the quadrature demodulator are signals output from the antenna reception signal or the quadrature modulator. A second switching means (corresponding to “switches 12a and 12b” in the first and second embodiments) that switches to either one of the signals, and a local oscillation signal used by the quadrature modulator by the first switching means When the generator is switched to become the local signal generator for reception, and the signal input to the quadrature demodulator is switched to the quadrature modulator output signal by the second switching means In addition, amplitude detection means for detecting the amplitudes of the I signal and the Q signal generated by performing orthogonal demodulation processing on the orthogonal modulator output signal input to the orthogonal demodulator, and stored in the storage unit The correction value are, characterized in that a correction value updating means for updating the correction value and the amplitude of equal amplitudes and Q signals of the detected I signal by the amplitude detection means.

  According to this aspect of the present invention, it is possible to correct the amplitude error between the received I signal and the received Q signal, which vary from one wireless device to another, and the received I signal and the received Q signal even if the power supply voltage and temperature vary. The effect of being able to obtain a good EVM characteristic, the inspection cost and the number of inspection steps can be reduced.

  In another aspect of the present invention, in the above aspect of the present invention, third switching means for switching so that the quadrature demodulator performs either orthogonal processing or does not perform orthogonal processing. (Corresponding to “switches 13a to 13c” in the second embodiment).

  According to the aspect of the present invention, the amplitude comparison process between the received I signal and the received Q signal can be performed in a short time, thereby reducing the current consumption required for the correction value update process.

  According to another aspect of the present invention, in the above aspect of the invention, the first switching means may be configured such that the local signal generator used by the quadrature modulator in the idle slot is the local signal generator for reception. The second switching means switches so that a signal input to the quadrature demodulator during the idle slot becomes a quadrature modulator output signal, and the third switching means switches during the idle slot. The orthogonal demodulator is switched so as not to perform orthogonal processing.

  According to the aspect of the present invention, when the connection method used is the time division multiple access method, the correction value update process can be performed with high frequency, and the correction value suitable for the power supply voltage and temperature at the time of amplitude correction is obtained. Can be updated.

  In another aspect of the present invention, in the above aspect of the present invention, the first switching means may be configured such that the local signal generator used by the quadrature modulator before the reception slot starts is the local signal generator for reception. The second switching means switches so that a signal input to the quadrature demodulator becomes a quadrature modulator output signal before the start of the reception slot, and the third switching means Before starting, the orthogonal demodulator is switched so as not to perform orthogonal processing.

  According to the aspect of the present invention, when the connection method used is the code division multiple access method, the correction value update processing can be performed with high frequency, and the correction value suitable for the power supply voltage and temperature at the time of amplitude correction is obtained. Can be updated.

  In addition, what applied the component, expression, or arbitrary combination of the component of this invention to a method, an apparatus, a system, a computer program, a recording medium, a data structure, etc. is also effective as an aspect of this invention.

  According to one aspect of the present invention, it is possible to correct the amplitude error between the received I signal and the received Q signal, which vary from one wireless device to another, and receive the received I signal and the received signal even if there are fluctuations in the power supply voltage and temperature. The Q signal amplitude error can be reduced, and an excellent EVM characteristic can be obtained, and the inspection cost and the number of inspection steps can be reduced.

  In addition, according to one aspect of the present invention, the amplitude comparison process between the received I signal and the received Q signal can be performed in a short time, thereby reducing the current consumption for the correction value update process. There is an effect.

  Further, according to one aspect of the present invention, when the connection method used is a time division multiple access method, the correction value update process can be performed at a high frequency, which is suitable for the power supply voltage and temperature at the time of amplitude correction. The correction value can be updated.

  In addition, according to one aspect of the present invention, when the connection method used is a code division multiple access method, the correction value update process can be performed with high frequency, which is suitable for the power supply voltage and temperature during amplitude correction. The correction value can be updated.

  Exemplary embodiments of a wireless device, a wireless circuit, and a wireless circuit control method according to the present invention will be explained below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments. The “I component of the signal” is sometimes referred to as “signal I component” or “signal component I”, but is referred to as “I signal” in this specification. Similarly, “Q component of signal” is called “Q signal”, “I component of transmission signal” is called “transmission I signal”, “Q component of transmission signal” is called “transmission Q signal”, and “ The “I component of the received signal” is referred to as “received I signal”, and the “Q component of the received signal” is referred to as “received Q signal”.

  First, in order to clarify the characteristics of the radio apparatus and the like according to the first embodiment, a received I signal and a received Q signal (hereinafter referred to as “received I / Q signal” when referring to a received I signal and a received Q signal). A conventional method for correcting the amplitude error will be described. In the conventional method for correcting the amplitude error of the received I / Q signal, first, several tens of wireless devices are randomly selected at the time of prototyping, and an external monitor is attached to the selected wireless device.

  After attaching the external monitor, a test signal is input to the wireless device, an output signal is displayed on the external monitor, and a correction value for equalizing the amplitude of the received I / Q signal is calculated by an external monitor, a predetermined device, or the like. Correction values are calculated from several tens of wireless devices, and an average value of these correction values is set for all wireless devices during the mass production process. Then, when performing communication, the wireless device corrects the amplitude error of the received I / Q signal based on the set correction value.

  FIG. 7 is a block diagram showing a circuit configuration when calculating a correction value of a conventional wireless device. As shown in the figure, a radio apparatus 100 includes a quadrature modulator 110, a power amplifier 121, an isolator 122, a duplexer 123, a high frequency switch 124, an antenna 125, a low noise amplifier 126, and a bandpass filter. 127, quadrature demodulator 130, low-pass filters 141a and 141b, variable gain amplifiers 142a and 142b, variable gain amplifiers 143a and 143b, analog-digital converters 144a and 144b, phase detector 150, storage Part 160.

  In the radio apparatus 100, the test signal generator 600 is attached to the high-frequency switch 124, and between the gain variable unit 143a and the analog-digital converter 144a and between the gain variable unit 143b and the analog-digital converter 144b. An external monitor 700 is attached.

  The quadrature modulator 110 is a circuit that modulates an input signal, and includes a transmitting local signal generator 111, a frequency divider 112, a phase shifter 113, and mixers 114a and 114b. Specifically, quadrature modulator 110 performs a quadrature modulation process on a transmission I signal and a transmission Q signal input from a circuit (not shown), and outputs the signal after the quadrature modulation process to power amplifier 121.

  Transmitting local oscillator signal generator 111 outputs a local oscillation signal to frequency divider 112. The frequency divider 112 converts the frequency of the local oscillation signal input from the transmission local oscillation signal generator 111 at a predetermined ratio, and outputs the frequency-converted local oscillation signal to the phase shifter 113. In the example of FIG. 7, the frequency divider 112 converts the frequency of the input local oscillation signal into a half frequency. Phase shifter 113 shifts the phase of the local oscillation signal input from frequency divider 112 by 90 degrees (π / 2), and outputs the local oscillation signal after the phase shift to mixers 114a and 114b.

  The mixer 114 a converts the frequency of the transmission I signal input from a circuit (not shown) using the local oscillation signal input from the phase shifter 113, and outputs the transmission I signal after frequency conversion to the power amplifier 121. Similarly, mixer 114 b converts the frequency of the transmission Q signal using the local oscillation signal input from phase shifter 113, and outputs the transmission Q signal after the frequency conversion to power amplifier 121.

  The power amplifier 121 amplifies the power of the signal obtained by mixing the transmission I signal input from the mixer 114 a and the transmission Q signal input from the mixer 114 b, and outputs the signal after power amplification to the isolator 122. The isolator 122 is a circuit that prevents an input / output signal from wrapping around, and outputs the signal input from the power amplifier 121 to the duplexer 123.

  The duplexer 123 is a circuit that enables the antenna 125 to be used for both signal transmission and reception. Specifically, the duplexer 123 outputs the signal input from the isolator 122 to the antenna 125 via the high frequency switch 124. Further, the duplexer 123 outputs the signal input from the antenna 125 or the signal input from the test signal generator 600 to the low noise amplifier 126.

  The high-frequency switch 124 generates a test signal when a signal input to the duplexer 123 is a signal received by the antenna 125 from the base station (hereinafter, a signal received by the antenna 125 from the base station is referred to as an “antenna reception signal”). This is a device for switching the connection so that it becomes one of the signals output from the generator 600 (hereinafter, the signal output from the test signal generator 600 is referred to as “test signal generator output signal”). In the prototype stage for calculating the correction value, as shown in FIG. 7, the high frequency switch 124 switches the connection so that the signal input from the test signal generator 600 is input to the duplexer 123.

  The antenna 125 is a device that transmits and receives signals to and from a base station (not shown). Specifically, a signal input from quadrature modulator 110 via power amplifier 121, isolator 122, and duplexer 123 is transmitted to the base station. Further, the antenna 125 outputs the antenna reception signal to the quadrature demodulator 130 via the duplexer 123, the low noise amplifier 126, and the band pass filter 127. As shown in FIG. 7, when the high-frequency switch 124 switches the connection so that the signal input to the duplexer 123 becomes the test signal generator output signal, the antenna 125 does not perform transmission / reception processing. .

  The low noise amplifier 126 is an amplifying circuit having a low noise figure, amplifies the antenna reception signal or the test signal generator output signal input from the duplexer 123, and outputs the amplified signal to the bandpass filter 127. The bandpass filter 127 passes only a predetermined frequency component of the signal input from the low noise amplifier 126 and outputs the passed signal to the quadrature demodulator 130.

  The quadrature demodulator 130 is a circuit that demodulates an input signal, and includes a receiving local signal generator 131, a frequency divider 132, a phase shifter 133, and mixers 134a and 134b. Reception local signal generator 131 outputs a local oscillation signal to frequency divider 132. The frequency divider 132 frequency-converts the frequency of the local oscillation signal input from the reception local oscillation signal generator 131 at a predetermined ratio (1/2 in the example shown in FIG. 7), and the local frequency after frequency conversion The oscillation signal is output to the phase shifter 133. Phase shifter 133 shifts the phase of the local oscillation signal input from frequency divider 132 by 90 degrees (π / 2), and outputs the phase-oscillated local oscillation signal to mixers 134a and 134b.

  The mixer 134a extracts the I signal of the signal input from the bandpass filter 127 using the local oscillation signal input from the phase shifter 133, and outputs the extracted received I signal to the low-pass filter 141a. Similarly, the mixer 134b uses the local oscillation signal input from the phase shifter 133 to extract the Q signal of the signal input from the band pass filter 127, and the extracted received Q signal to the low pass filter 141b. Output.

  The low-pass filter 141a limits a predetermined band of the reception I signal input from the mixer 134a, and outputs the band-limited reception I signal to the variable gain amplifier 142a. Similarly, the low-pass filter 141b limits a predetermined band of the reception Q signal input from the mixer 134b, and outputs the reception Q signal after the band limitation to the variable gain amplifier 142b.

  The variable gain amplifier 142a amplifies the gain of the received I signal input from the low-pass filter 141a, and outputs the received I signal after gain amplification to the gain variable device 143a. Similarly, variable gain amplifier 142b amplifies the gain of the received Q signal input from low-pass filter 141b, and outputs the received Q signal after gain amplification to gain variable device 143b.

  The gain variable device 143a corrects the amplitude of the received I signal input from the variable gain amplifier 142a based on the correction value stored in the storage unit 160, and converts the received I signal after the amplitude correction into the analog-to-digital converter 144a. Output to. Similarly, the gain variable device 143b corrects the amplitude of the received Q signal input from the variable gain amplifier 142b based on the correction value stored in the storage unit 160, and the received Q signal after the amplitude correction is analog-digital. It outputs to the converter 144b. The storage unit 160 is a storage circuit that stores information, and stores correction values necessary for the gain variable devices 143a and 143b to correct the amplitude of the received I / Q signal.

  The analog-to-digital converter 144 a converts the received I signal input from the gain variable unit 143 a into a digital signal, and outputs the received I signal converted into the digital signal to the phase detector 150. Similarly, the analog-to-digital converter 144b converts the received Q signal input from the gain variable unit 143b into a digital signal, and outputs the received Q signal converted into the digital signal to the phase detector 150. The phase detector 150 detects the phases of the received I signal and the received Q signal input from the analog-digital converters 144a and 144b.

  The test signal generator 600 is a device that outputs a test signal to the wireless device 100. When the test signal is output from the test signal generator 600 to the radio apparatus 100, the external monitor 700 displays the received I signal and the received Q signal output from the gain variable devices 143a and 143b on a predetermined display unit. The external monitor 700 or a predetermined device (not shown) calculates a correction value that makes the amplitude of the received I signal equal to the amplitude of the received Q signal.

  In this way, in the conventional correction value calculation method, the correction value is acquired by inputting the test signal to some of the wireless devices 100 at the time of trial manufacture. And the average value of the correction value acquired from several radio | wireless apparatuses 100 is written in the memory | storage part of all the radio | wireless apparatuses at the time of a mass production process.

  However, since the wireless device 100 in which the correction value is set using the conventional correction value calculation method has an average value of correction values obtained from a limited number of wireless devices, the wireless device 100 is fixedly set. There is a problem that the error that varies from one solid to another cannot be corrected sufficiently. In addition, even if correction values are individually adjusted for all wireless devices during the mass production process, it is not possible to cope with amplitude errors that fluctuate due to fluctuations in power supply voltage and temperature, and the inspection man-hours and inspection costs increase. There was a problem to do.

  Next, an outline of the wireless device according to the first embodiment will be described. The radio apparatus according to the first embodiment operates in two types of operation modes, “communication mode” and “correction value update mode”. The “communication mode” here refers to demodulating an antenna reception signal and outputting it to a predetermined device (speaker or the like) or modulating information inputted from a predetermined device (microphone or the like) The state which transmits to a base station via is shown. The “correction value update mode” indicates a state in which the correction value is updated using a test signal generated inside the wireless device without transmitting / receiving a signal to / from the base station.

  The wireless device according to the first embodiment switches between the “communication mode” and the “correction value update mode” during operation, and updates the correction value stored in the wireless device in the “correction value update mode”. In the “communication mode”, the amplitude error of the received I / Q signal is corrected based on the updated correction value. Since the wireless device according to the first embodiment corrects the amplitude error of the received I / Q signal based on the frequently updated correction value, the wireless device varies depending on an error that varies from one wireless device to another, a fluctuation in power supply voltage, and temperature. It can cope with amplitude error.

  Here, the timing when the wireless device switches the operation mode to the “communication mode” or the “correction value update mode” will be described. Based on the time slot, the wireless device switches the operation mode to “communication mode” when it is in a state of performing communication. Then, based on the time slot, the wireless device switches the operation mode to the “correction value update mode” when the wireless device is not in communication.

  For example, when the connection method used for the wireless device is a time division multiple access method (hereinafter referred to as “TDMA (Time Division Multiple Access)”), the wireless device normally operates in “communication mode” and performs communication. When there is no idle time (so-called “during idle slot”), the operation is switched to the “correction value update mode”. For example, when the connection method used for the wireless device is a code division multiple access method (hereinafter referred to as “CDMA (Code Division Multiple Access)”), the wireless device normally operates in “communication mode” and performs communication. The operation is performed by switching to the “correction value update mode” in the idle time before performing (so-called “before reception slot”).

  In any connection method, the wireless device may be operated in the “correction value update mode” immediately after power is turned on. Thereby, the wireless device can update the correction value immediately after the power is turned on.

  FIG. 1 is a diagram for explaining the outline of the wireless device according to the first embodiment. In the following description, parts having the same functions as the constituent parts shown in FIG. FIG. 1 shows a state where the operation mode of the wireless device is the “correction value update mode”.

  As shown in the figure, the radio apparatus 200 according to the first embodiment includes an antenna 125, gain variable devices 143a and 143b, a storage unit 160, a quadrature modulator 210, a quadrature demodulator 230, and switches 12a and 12b. And a correction value calculation control unit 240.

  The quadrature modulator 210 has a switch 11. The switch 11 is a device that switches connections so that the local oscillator signal generator used by the quadrature modulator 210 is either the local transmitter signal generator 111 for transmission or the local oscillator signal generator 131 for reception.

  Specifically, the switch 11 is configured so that the local oscillator signal generator used by the quadrature modulator 210 becomes the transmitting local oscillator signal generator 111 before the operation mode of the radio apparatus 200 is switched to the “communication mode”. Switch connection. Further, when the operation mode of the radio apparatus 200 is switched to the “correction value update mode”, the switch 11 is configured such that the local signal generator used by the quadrature modulator 210 is a reception local signal generator as shown in FIG. The connection is switched to 131.

  When the operation mode of radio apparatus 200 is “communication mode”, quadrature modulator 210 uses a signal input from a microphone (not shown) or the like and a local oscillation signal input from transmitting local signal generator 111. To modulate. On the other hand, when the operation mode of radio apparatus 200 is “correction value update mode”, quadrature modulator 210 receives test signals (transmission I signal and transmission Q signal) input from a predetermined circuit (not shown). Modulation is performed using the local oscillation signal input from the local signal generator 131. Note that an existing circuit may be used as the circuit for generating the test signal, or a circuit for outputting the test signal may be newly provided.

  When the operation mode of the radio apparatus 200 is the “correction value update mode”, the reason why the local oscillator signal generator 131 used by the quadrature modulator 210 is the reception local oscillator signal generator 131 is the reception of the quadrature demodulator 230 or the like. This is because a test signal having a frequency suitable for the circuit on the side is generated.

  Even if the operation mode of the radio apparatus 200 is “correction value update mode” without providing the switch 11, the local oscillator signal generator used by the quadrature modulator 210 is the local oscillator generator 111 for transmission. It is good. In such a case, the radio apparatus 200 needs to convert the frequency of the local oscillation signal output from the transmission local oscillator signal generator 111 into a frequency suitable for the circuit on the reception side.

  In the switches 12a and 12b, a signal input to the quadrature demodulator 230 is an antenna reception signal or a signal output from the quadrature modulator 210 (hereinafter, a signal output from the quadrature modulator 210 is referred to as a “quadrature modulator output signal”. It is a device that switches the connection so that it becomes either one of the above.

  Specifically, the switches 12a and 12b switch the connection so that the signal input to the quadrature demodulator 230 becomes the antenna reception signal before the operation mode of the radio apparatus 200 is switched to the “communication mode”. In addition, when the operation mode of the radio apparatus 200 is switched to the “correction value update mode”, the switches 12a and 12b, as shown in FIG. 1, the signal input to the quadrature demodulator 230 becomes a quadrature modulator output signal. Switch the connection so that.

  The flow of the correction value update process in the wireless device 200 will be described with reference to FIG. When the operation mode of the wireless device 200 is switched to the “correction value update mode”, the switch 11 and the switches 12a and 12b switch the connection as shown in FIG. 1 (step S1).

  As a result, the local oscillation signal output from the reception local oscillator signal generator 131 is input to the quadrature modulator 210 (step S2), and the quadrature modulator 210 converts the transmission I signal and the transmission Q signal of the test signal, Quadrature modulation processing is performed using the local oscillation signal output from the reception local oscillator signal generator 131.

  The quadrature modulator output signal is input to the quadrature demodulator 230 via the switches 12a and 12b, and is subjected to quadrature demodulation processing by the quadrature demodulator 230 and divided into received I / Q signals (step S3). The received I signal is input to the correction value calculation control unit 240 via the gain variable 143a, and the received Q signal is input to the correction value calculation control unit 240 via the gain variable 143b (step S4).

  The correction value calculation control unit 240 detects the amplitude of the input received I / Q signal, and updates the correction value stored in the storage unit 160 to a correction value that makes the amplitude of the received I / Q signal equal (step). S5).

  As described above, the radio apparatus 200 performs quadrature modulation processing on the test signal using the local oscillation signal output from the reception local signal generator 131 by switching the connection between the switch 11 and the switches 12a and 12b, and performs quadrature modulation processing. The correction value is calculated using the later signal as the test signal, and the correction value stored in the storage unit 160 is updated.

  Then, before the operation mode of the radio apparatus 200 is switched to the “communication mode”, the switch 11 switches the connection so that the local oscillator signal generator used by the quadrature modulator 210 becomes the local oscillator generator 111 for transmission. The switches 12a and 12b switch the connection so that the signal input to the quadrature demodulator 230 becomes an antenna reception signal.

  When an antenna reception signal is input, quadrature demodulator 230 generates a reception I / Q signal by performing orthogonal demodulation processing on the antenna reception signal, and outputs the generated reception I / Q signal to gain variable devices 143a and 143b. . Then, gain variable devices 143a and 143b correct the amplitude error of the received I / Q signal based on the correction value stored in storage unit 160.

  As described above, since the wireless device 200 according to the first embodiment frequently updates the correction value, it is possible to correct an error that varies from one wireless device to another, and even if there is a variation in power supply voltage or temperature. The amplitude error between the received I signal and the received Q signal can be reduced, and good EVM characteristics can be obtained. In addition, since the radio apparatus 200 obtains an appropriate correction value by updating the correction value for each individual using its own circuit, it is not necessary to perform an inspection related to the amplitude error of the received I / Q signal at the time of prototyping. Costs and inspection man-hours can be reduced. Further, since a quadrature-modulated transmission I / Q signal is used as a test signal source, there is no problem that a baseband signal cannot be obtained when a signal having the same frequency is input to the mixer circuit.

  Next, a circuit configuration in the correction value update mode of the wireless device 200 according to the first embodiment will be described. FIG. 2 is a block diagram illustrating a circuit configuration of the wireless device 200 according to the first embodiment when in the correction value update mode.

  As shown in the figure, the radio apparatus 200 includes a power amplifier 121, an isolator 122, a duplexer 123, a high frequency switch 124, an antenna 125, a low noise amplifier 126, a band pass filter 127, and a low-pass filter. Filters 141a and 141b, variable gain amplifiers 142a and 142b, variable gain amplifiers 143a and 143b, analog-digital converters 144a and 144b, phase detector 150, storage 160, quadrature modulator 210, and quadrature demodulation Device 230, correction value calculation controller 240, and switches 12a and 12b.

  The quadrature modulator 210 has a new switch 11 as compared with the quadrature modulator 110 constituting the conventional radio apparatus 100 shown in FIG. The switch 11 is a device that switches connections so that the local oscillator signal generator used by the quadrature modulator 210 is either the local transmitter signal generator 111 for transmission or the local oscillator signal generator 131 for reception.

  In the example shown in FIG. 2, since the radio apparatus 200 operates in the “correction value update mode”, the switch 11 uses the local oscillator signal generator used by the quadrature modulator 210 as the reception local oscillator signal generator 131. The connection is switched to become.

  The switches 12a and 12b are devices that switch connections so that a signal input to the quadrature demodulator 230 is either an antenna reception signal or a quadrature modulator output signal. In the example shown in FIG. 2, since the radio apparatus 200 operates in the “correction value update mode”, the switches 12a and 12b are configured so that the signal input to the quadrature demodulator 230 becomes the quadrature modulator output signal. The connection is switched to.

  As described above, when the operation mode of the wireless device 200 is switched to the “correction value update mode”, the switch 11 and the switches 12a and 12b switch the connection to the state illustrated in FIG. A test signal input from a circuit (not shown) is subjected to quadrature modulation processing using a local oscillation signal input from the receiving local signal generator 131.

  In the example shown in FIG. 2, the quadrature demodulator 230 is input from the quadrature modulator 210 via the power amplifier 121, the isolator 122, the switches 12 a and 12 b, the low noise amplifier 126, and the bandpass filter 127. The quadrature modulator output signal is subjected to quadrature demodulation processing to generate a reception I / Q signal, the generated reception I signal is output to the low-pass filter 141a, and the generated reception Q signal is output to the low-pass filter 141b. Output.

  The correction value calculation control unit 240 is a control unit that operates only when the operation mode of the wireless device 200 is the “correction value update mode”, and includes amplitude detection units 241 a and 241 b and a correction value update unit 242.

  The amplitude detector 241a is a processor that detects the amplitude of the input signal. Specifically, the amplitude and phase of the received I signal input from the quadrature demodulator 230 via the low-pass filter 141a, the variable gain amplifier 142a, the gain variable unit 143a, and the analog-digital converter 144a are obtained. The amplitude information obtained by averaging the included information is detected, and the detected amplitude information is output to the correction value update unit 242. Similarly, the amplitude detector 241b receives the amplitude of the received Q signal input from the quadrature demodulator 230 via the low-pass filter 141b, the gain variable amplifier 142b, the gain variable 143b, and the analog / digital converter 144b. Amplitude information obtained by averaging information including the phase and the phase is detected, and the detected amplitude information is output to the correction value updating unit 242.

  The correction value update unit 242 is a processing unit that calculates the correction value and updates the correction value in the storage unit 160. Specifically, the amplitude information of the reception I signal and the reception Q signal input from the amplitude detection units 241a and 241b is compared, and the correction value stored in the storage unit 160 is determined as the amplitude of the reception I signal and the reception Q. The correction value is updated so that the amplitude of the signal is equal to the amplitude.

  The correction value may be a value that makes the amplitude of the received Q signal equal to the amplitude of the received I signal, or may be a value that makes the amplitude of the received I signal equal to the amplitude of the received Q signal. Alternatively, a predetermined reference amplitude value may be determined, and values that make the amplitude of the received I signal and the amplitude of the received Q signal equal to the reference amplitude value may be used as the correction value.

  Next, correction value update processing by the wireless device 200 according to the first embodiment will be described. FIG. 3 is a flowchart illustrating the correction value update process performed by the wireless device 200 according to the first embodiment. As shown in the figure, when the wireless device 200 is in an idle slot (Yes in step S301), the wireless device 200 switches the operation mode to the “correction value update mode”.

  The switch 11 switches the connection so that the local oscillator signal generator used by the quadrature modulator 210 becomes the reception local oscillator signal generator 131, and the switches 12 a and 12 b are signals input to the quadrature demodulator 230. Are switched so as to become the quadrature modulator output signal (step S302).

  Then, a test signal is output from the circuit (not shown) to the quadrature modulator 210, and a local oscillation signal is output from the reception local oscillator signal generator 131 to the quadrature modulator 210 (step S303). The quadrature modulator 210 performs a quadrature modulation process on the input test signal using the local oscillation signal input from the reception local oscillator signal generator 131, and the test signal after the quadrature modulation process is connected to the power amplifier 121. The signal is output to the quadrature demodulator 230 via the isolator 122, the switches 12 a and 12 b, the low noise amplifier 126, and the band pass filter 127.

  The quadrature demodulator 230 performs a quadrature demodulation process on the input test signal to generate a reception I / Q signal. The quadrature demodulator 230 outputs the generated received I signal to the correction value calculation control unit 240 via the low-pass filter 141a, the gain variable amplifier 142a, the gain variable device 143a, and the analog / digital converter 144a. Similarly, the quadrature demodulator 230 passes the generated received Q signal to the correction value calculation control unit 240 via the low-pass filter 141b, the variable gain amplifier 142b, the variable gain amplifier 143b, and the analog / digital converter 144b. Output.

  The amplitude detection unit 241a detects amplitude information obtained by averaging information including the amplitude and phase of the received I signal input from the analog-digital converter 144a, and outputs the detected amplitude information to the correction value update unit 242. . Similarly, the amplitude detection unit 241b detects amplitude information obtained by averaging information including the amplitude and phase of the received Q signal input from the analog-digital converter 144b, and the detected amplitude information is corrected to a correction value update unit 242. (Step S304).

  Then, the correction value updating unit 242 compares the amplitude information of the reception I signal and the amplitude information of the reception Q signal input from the amplitude detection units 241a and 241b, and compares the amplitude of the reception I signal and the amplitude of the reception Q signal. Is calculated (step S305), and the correction value stored in the storage unit 160 is updated to a correction value with which the amplitude of the received I signal and the amplitude of the received Q signal are equal. (Step S306).

  Thereafter, the switch 11 switches the connection so that the local oscillator signal generator used by the quadrature modulator 210 becomes the transmission local oscillator signal generator 111, and the switches 12 a and 12 b are signals input to the quadrature demodulator 230. However, the connection is switched so as to become an antenna reception signal (step S307).

  In the example of FIG. 3, the case where the radio apparatus 200 is applied to TDMA is shown, but when the radio apparatus 200 is applied to CDMA, correction value update processing is performed before the reception slot.

  Next, a circuit configuration in the communication mode of the wireless device 200 according to the first embodiment will be described. FIG. 4 is a block diagram illustrating a circuit configuration of the wireless device 200 according to the first embodiment when in the communication mode.

  In the example shown in the figure, since the radio apparatus 200 operates in the “communication mode”, the local signal generator used by the quadrature modulator 210 is connected to the switch 11 as shown in FIG. The connection is switched to become the local signal generator 111. Further, as shown in FIG. 4, the switches 12a and 12b are in a state of switching the connection so that the signal input to the quadrature demodulator 230 becomes an antenna reception signal.

  When a received I signal generated from an antenna received signal is input, gain variable device 143a corrects the amplitude of received I signal based on the correction value stored in storage unit 160. Similarly, when the reception Q signal generated from the antenna reception signal is input, gain variable device 143 b corrects the amplitude of reception Q signal based on the correction value stored in storage unit 160.

  Next, amplitude error correction processing by the wireless device 200 according to the first embodiment will be described. FIG. 5 is a flowchart illustrating the amplitude error correction process performed by the wireless device 200 according to the first embodiment. As shown in the figure, when the antenna 125 receives a signal from the outside (step S401), the antenna reception signal is converted into a high frequency switch 124, a duplexer 123, a switch 12a, a low noise amplifier 126, and a bandpass filter. And output to the quadrature demodulator 230.

  The quadrature demodulator 230 performs quadrature demodulation processing on the input antenna reception signal to generate a reception I / Q signal, and the gain of the generated reception I signal is variable via the low-pass filter 141a and the variable gain amplifier 142a. And outputs the generated reception Q signal to the gain variable device 143b via the low-pass filter 141b and the variable gain amplifier 142b.

  The gain variable unit 143a corrects the amplitude of the input received I signal based on the correction value stored in the storage unit 160, and the gain variable unit 143b is based on the correction value stored in the storage unit 160. Then, the amplitude of the received reception Q signal is corrected (step S402).

  As described above, in the first embodiment, when the operation mode of the radio apparatus 200 is switched to the “correction value update mode”, the switch 11 and the switches 12a and 12b are switched and the quadrature modulator 210 is used for reception. Using the local oscillation signal output from the local signal generator 131, the test signal is subjected to quadrature modulation processing, and the test signal after the quadrature modulation processing is input to the quadrature demodulator 230, which then orthogonalizes the test signal. A demodulation process is performed to generate a reception I / Q signal, and the generated reception I / Q signal is input to the correction value calculation control unit 240 so that the correction value calculation control unit 240 corrects an amplitude error of the reception I / Q signal. And the correction value stored in the storage unit 160 is updated to a correction value in which the amplitude of the received I signal and the amplitude of the received Q signal are equal to each other. Error can be sufficiently corrected varying for, and may correspond to the amplitude error varies with the variation in the power supply voltage and temperature. In addition, since the radio apparatus 200 obtains an appropriate correction value by updating the correction value for each individual using its own circuit, it is not necessary to perform an inspection related to the amplitude error of the received I / Q signal at the time of prototyping. Costs and inspection man-hours can be reduced.

  The wireless device 200 according to the first embodiment includes, for example, a mobile terminal device such as a mobile phone and a PDA (Personal Digital Assistant), a communication card and a communication board for performing wireless communication, and a personal computer incorporating the communication card and the communication board. Etc. can be applied. In addition, the wireless device 200 according to the first embodiment can be applied to, for example, an electronic circuit included in a mobile terminal device, a communication card, or the like.

  In the first embodiment, the quadrature demodulator 230 performs orthogonal processing on the test signal input from the quadrature modulator 210 to generate a reception I / Q signal, and outputs the generated reception I / Q signal to the correction value calculation control unit 240. In the second embodiment, the correction value calculation control unit 240 calculates the correction value by comparing the amplitudes of the received I / Q signals. In the second embodiment, the quadrature demodulator 230 is input from the quadrature modulator 210. An example in which the test signal is not orthogonally processed will be described.

  FIG. 6 is a block diagram illustrating a circuit configuration in the correction value update mode of the wireless device according to the second embodiment. As shown in the figure, the quadrature demodulator 530 constituting the radio apparatus 500 newly includes a frequency divider 135 and switches 13a to 13c as compared to the quadrature demodulator 230 shown in FIG. Frequency divider 135 frequency-converts the local oscillation signal input from reception local oscillation signal generator 131 at a predetermined ratio, and outputs the frequency-converted local oscillation signal to mixers 134a and 134b.

  The switches 13a to 13c are devices that switch connections so that the quadrature demodulator 530 performs orthogonal processing or does not perform orthogonal processing. The switches 13a to 13c switch connections so that the orthogonal demodulator 530 performs orthogonal processing before the operation mode of the wireless device 500 is switched to the “communication mode”. Further, when the operation mode of the wireless device 500 is switched to the “correction value update mode”, the switches 13 a to 13 c switch the connection so that the orthogonal demodulator 530 does not perform the orthogonal processing, as illustrated in FIG. 6.

  In the example illustrated in FIG. 6, the quadrature demodulator 530 performs quadrature modulation from the quadrature modulator 210 via the power amplifier 121, the isolator 122, the switches 12 a and 12 b, the low noise amplifier 126, and the bandpass filter 127. The device output signal is input.

  As illustrated in FIG. 6, when the operation mode of the wireless device 500 is the “correction value update mode”, the switches 13 a to 13 c switch connections so that the orthogonal demodulator 530 does not perform orthogonal processing. 530 outputs the received I signal to the low-pass filter 141a and outputs the received Q signal to the low-pass filter 141b without performing orthogonal processing on the input quadrature modulator output signal. Since the received I / Q signals input to the low-pass filters 141a and 141b are frequency-converted by the local signals having the same phase in the mixers 134a and 134b, they have the same phase.

  The amplitude detector 241a detects the amplitude of the received I signal input from the analog-digital converter 144a, and the amplitude detector 241b detects the amplitude of the received Q signal input from the analog-digital converter 144b. Since the received I signal and the received Q signal have the same phase, there is no need to perform phase averaging processing. Thereby, the wireless device 500 can perform the amplitude comparison process in a short time. The radio apparatus 500 according to the second embodiment is particularly useful when applied to TDMA or the like in which an idle slot is extremely short.

  As described above, in the second embodiment, when the operation mode of the wireless device 500 is switched to the “correction value update mode”, the switch 11 and the switches 12a and 12b are switched and the quadrature demodulator 530 is orthogonal. Since the switches 13a to 13c are configured to switch connections so as not to perform processing, the amplitude detectors 241a and 241b do not need to perform phase averaging processing on the received I signal and the received Q signal, and update the correction value. The unit 242 can perform the amplitude comparison process in a short time. Thereby, the consumption current concerning a correction value update process can be reduced.

(Supplementary note 1) An antenna that receives a signal from the outside, a quadrature modulator that performs a quadrature modulation process using a signal output from a local signal generator for transmission, and an antenna reception signal received via the antenna A quadrature demodulator that performs quadrature demodulation processing using a signal output from a local signal generator, and an amplitude error between an I signal and a Q signal that are generated by orthogonal demodulation processing of an antenna reception signal by a quadrature demodulator is corrected. And a gain variable unit that corrects an amplitude error between the I signal and the Q signal using the correction value stored in the storage unit.
A first switching means for switching so that the local oscillator signal generator used by the quadrature modulator is either the transmitting local oscillator generator or the receiving local oscillator generator;
Second switching means for switching so that the signal input to the quadrature demodulator is either the antenna reception signal or the quadrature modulator output signal output from the quadrature modulator;
The local switching signal generator used by the quadrature modulator is switched by the first switching means so as to be the receiving local signal generator, and is input to the quadrature demodulator by the second switching means. The amplitude of the I and Q signals generated by the orthogonal demodulation processing of the orthogonal modulator output signal input to the orthogonal demodulator is detected. Amplitude detection means;
Correction value updating means for updating the correction value stored in the storage unit to a correction value in which the amplitude of the I signal and the amplitude of the Q signal detected by the amplitude detection means are equal to each other. A wireless device characterized.

(Supplementary note 2) The supplementary note 1 according to supplementary note 1, further comprising third switching means for switching so that the orthogonal demodulator performs orthogonal processing or does not perform orthogonal processing. Wireless device.

(Supplementary note 3) The first switching means switches so that the local oscillator signal generator used by the quadrature modulator becomes the reception local oscillator generator during an idle slot,
The radio apparatus according to appendix 1, wherein the second switching means switches so that a signal input to the quadrature demodulator during an idle slot becomes a quadrature modulator output signal.

(Supplementary Note 4) The first switching means switches so that the local signal generator used by the quadrature modulator becomes the reception local signal generator before the start of the reception slot,
2. The radio apparatus according to appendix 1, wherein the second switching unit performs switching so that a signal input to the quadrature demodulator becomes a quadrature modulator output signal before starting a reception slot.

(Supplementary Note 5) The first switching means switches so that the local oscillator signal generator used by the quadrature modulator becomes the reception local oscillator generator during an idle slot,
The second switching means switches so that a signal input to the quadrature demodulator during an idle slot becomes a quadrature modulator output signal,
The wireless apparatus according to appendix 2, wherein the third switching means switches so that the orthogonal demodulator does not perform orthogonal processing during an idle slot.

(Supplementary note 6) The first switching means switches so that the local oscillator signal generator used by the quadrature modulator becomes the reception local oscillator generator before the start of the reception slot,
The second switching means switches so that a signal input to the quadrature demodulator before the reception slot starts becomes a quadrature modulator output signal,
The wireless apparatus according to appendix 2, wherein the third switching means switches so that the orthogonal demodulator does not perform orthogonal processing before the reception slot starts.

(Supplementary note 7) An antenna that receives a signal from the outside, a quadrature modulator that performs a quadrature modulation process using a signal output from a transmission local signal generator, and an antenna reception signal received via the antenna A quadrature demodulator that performs quadrature demodulation processing using a signal output from a local signal generator, and an amplitude error between an I signal and a Q signal that are generated by orthogonal demodulation processing of an antenna reception signal by a quadrature demodulator is corrected. A wireless circuit having a storage unit for storing a correction value and a gain variable unit that corrects an amplitude error between the I signal and the Q signal using the correction value stored in the storage unit,
A first switching means for switching so that the local oscillator signal generator used by the quadrature modulator is either the transmitting local oscillator generator or the receiving local oscillator generator;
Second switching means for switching so that the signal input to the quadrature demodulator is either the antenna reception signal or the quadrature modulator output signal output from the quadrature modulator;
The local switching signal generator used by the quadrature modulator is switched by the first switching means so as to be the receiving local signal generator, and is input to the quadrature demodulator by the second switching means. The amplitude of the I and Q signals generated by the orthogonal demodulation processing of the orthogonal modulator output signal input to the orthogonal demodulator is detected. Amplitude detection means;
Correction value updating means for updating the correction value stored in the storage unit to a correction value in which the amplitude of the I signal and the amplitude of the Q signal detected by the amplitude detection means are equal to each other. A featured radio circuit.

(Supplementary note 8) The supplementary note 7, further comprising third switching means for switching so that the orthogonal demodulator performs orthogonal processing or does not perform orthogonal processing. Wireless circuit.

(Supplementary note 9) The first switching means switches so that the local oscillator signal generator used by the quadrature modulator becomes the reception local oscillator generator during the idle slot,
The radio circuit according to appendix 7, wherein the second switching means switches so that a signal input to the quadrature demodulator during an idle slot becomes a quadrature modulator output signal.

(Supplementary Note 10) The first switching means switches so that the local oscillator signal generator used by the quadrature modulator becomes the reception local oscillator generator before the reception slot starts,
The radio circuit according to appendix 7, wherein the second switching means switches so that a signal input to the quadrature demodulator becomes a quadrature modulator output signal before a reception slot starts.

(Supplementary Note 11) The first switching means switches so that the local oscillator signal generator used by the quadrature modulator during the idle slot becomes the local oscillator generator for reception,
The second switching means switches so that a signal input to the quadrature demodulator during an idle slot becomes a quadrature modulator output signal,
9. The radio circuit according to appendix 8, wherein the third switching means performs switching so that the quadrature demodulator does not perform quadrature processing during an idle slot.

(Supplementary Note 12) The first switching means switches so that the local signal generator used by the quadrature modulator becomes the reception local signal generator before the start of the reception slot,
The second switching means switches so that a signal input to the quadrature demodulator before the reception slot starts becomes a quadrature modulator output signal,
9. The radio circuit according to appendix 8, wherein the third switching means performs switching so that the quadrature demodulator does not perform quadrature processing before starting a reception slot.

(Supplementary note 13) An antenna that receives a signal from the outside, a quadrature modulator that performs a quadrature modulation process using a signal output from a transmitting local signal generator, and an antenna reception signal received via the antenna A quadrature demodulator that performs quadrature demodulation processing using a signal output from a local signal generator, and an amplitude error between an I signal and a Q signal that are generated by orthogonal demodulation processing of an antenna reception signal by a quadrature demodulator is corrected. Wireless circuit control method for controlling a wireless circuit having a storage unit for storing a correction value and a gain variable unit for correcting an amplitude error between the I signal and the Q signal using the correction value stored in the storage unit Because
A first switching step of switching so that a local oscillator signal generator used by the quadrature modulator is either the transmitting local oscillator signal generator or the receiving local oscillator signal generator;
A second switching step for switching so that the signal input to the quadrature demodulator is either the antenna reception signal or the quadrature modulator output signal output from the quadrature modulator;
The local signal generator used by the quadrature modulator is switched to become the reception local signal generator by the first switching step, and is input to the quadrature demodulator by the second switching step. The amplitude of the I and Q signals generated by the orthogonal demodulation processing of the orthogonal modulator output signal input to the orthogonal demodulator is detected. An amplitude detection step;
A correction value updating step for updating the correction value stored in the storage unit to a correction value in which the amplitude of the I signal and the amplitude of the Q signal detected by the amplitude detection step are equal to each other. A method of controlling a radio circuit.

(Supplementary note 14) The supplementary note 13, wherein the quadrature demodulator further includes a third switching step for switching so that the quadrature demodulator performs quadrature processing or does not perform quadrature processing. Radio circuit control method.

(Supplementary Note 15) In the first switching step, switching is performed so that the local oscillator signal generator used by the quadrature modulator becomes the reception local oscillator generator during an idle slot.
14. The radio circuit control method according to appendix 13, wherein the second switching step switches so that a signal input to the quadrature demodulator during an idle slot becomes a quadrature modulator output signal.

(Supplementary Note 16) The first switching step switches so that the local oscillator signal generator used by the quadrature modulator becomes the reception local oscillator generator before the start of the reception slot,
14. The radio circuit control method according to appendix 13, wherein the second switching step switches so that a signal input to the quadrature demodulator becomes a quadrature modulator output signal before a reception slot starts.

(Supplementary Note 17) In the first switching step, switching is performed so that the local oscillator signal generator used by the quadrature modulator becomes the reception local oscillator generator during an idle slot.
The second switching step switches so that a signal input to the quadrature demodulator during an idle slot becomes a quadrature modulator output signal,
15. The radio circuit control method according to appendix 14, wherein the third switching step performs switching so that the quadrature demodulator does not perform quadrature processing during an idle slot.

(Supplementary Note 18) The first switching step switches so that a local signal generator used by the quadrature modulator becomes the local signal generator for reception before the reception slot starts,
The second switching step switches so that a signal input to the quadrature demodulator before the start of the reception slot becomes a quadrature modulator output signal,
15. The radio circuit control method according to appendix 14, wherein the third switching step performs switching so that the quadrature demodulator does not perform quadrature processing before the reception slot starts.

  As described above, the wireless device, the wireless circuit, and the wireless circuit control method according to the present invention are useful when correcting the amplitude error between the received I signal and the received Q signal, and in particular, without increasing the circuit scale. This is suitable when it is necessary to always reduce the amplitude error between the received I signal and the received Q signal and obtain good EVM characteristics even when the power supply voltage and temperature fluctuate.

1 is a diagram for explaining an overview of a wireless device according to Embodiment 1. FIG. FIG. 3 is a block diagram illustrating a circuit configuration in a correction value update mode of the wireless device according to the first embodiment. 6 is a flowchart illustrating correction value update processing by the wireless device according to the first embodiment. 1 is a block diagram illustrating a circuit configuration in a communication mode of a wireless device according to a first embodiment. 6 is a flowchart illustrating an amplitude error correction process performed by the wireless device according to the first embodiment. FIG. 10 is a block diagram illustrating a circuit configuration in a correction value update mode of a wireless device according to a second embodiment. It is a block diagram which shows the circuit structure at the time of the correction value calculation of the conventional radio | wireless apparatus.

Explanation of symbols

11, 12a, 12b, 13a, 13b, 13c switch 100 wireless device 110 quadrature modulator 111 transmitting local signal generator 112 frequency divider 113 phase shifter 114a, 114b mixer 121 power amplifier 122 isolator 123 duplexer 124 high frequency switch 125 antenna 126 low noise amplifier 127 band pass filter 130 quadrature demodulator 131 reception local signal generator 132, 135 frequency divider 133 phase shifter 134a, 134b mixer 141a, 141b low pass filter 142a, 142b variable gain amplifier 143a , 143b Gain variable unit 144a, 144b Analog to digital converter 150 Phase detector 160 Storage unit 200 Radio device 210 Quadrature modulator 230 Quadrature demodulator 240 Correction value calculation control unit 241a, 241b Detector 242 correction value updating unit 500 radio unit 530 quadrature demodulator 600 test signal generator 700 external monitor

Claims (6)

An antenna that receives a signal from the outside, a quadrature modulator that performs quadrature modulation processing using a signal output from the local signal generator for transmission, and a local signal for reception of the antenna reception signal received via the antenna Correction value for correcting an amplitude error between the I signal and the Q signal generated by orthogonal demodulation processing of the antenna reception signal by the orthogonal demodulator using the signal output from the transmitter And a gain variable unit that corrects an amplitude error between the I signal and the Q signal using a correction value stored in the storage unit,
A first switching means for switching so that the local oscillator signal generator used by the quadrature modulator is either the transmitting local oscillator generator or the receiving local oscillator generator;
Second switching means for switching so that the signal input to the quadrature demodulator is either the antenna reception signal or the quadrature modulator output signal output from the quadrature modulator;
The local switching signal generator used by the quadrature modulator is switched by the first switching means so as to be the receiving local signal generator, and is input to the quadrature demodulator by the second switching means. The amplitude of the I and Q signals generated by the orthogonal demodulation processing of the orthogonal modulator output signal input to the orthogonal demodulator is detected. Amplitude detection means;
Correction value updating means for updating the correction value stored in the storage unit to a correction value in which the amplitude of the I signal and the amplitude of the Q signal detected by the amplitude detection means are equal to each other. A wireless device characterized.   The radio apparatus according to claim 1, further comprising third switching means for switching so that the quadrature demodulator performs either orthogonal processing or non-orthogonal processing. The first switching means switches so that the local oscillator signal generator used by the quadrature modulator during the idle slot becomes the reception local oscillator signal generator,
The second switching means switches so that a signal input to the quadrature demodulator during an idle slot becomes a quadrature modulator output signal,
3. The radio apparatus according to claim 2, wherein the third switching unit performs switching so that the orthogonal demodulator does not perform orthogonal processing during an idle slot. The first switching means switches so that the local oscillator signal generator used by the quadrature modulator becomes the reception local oscillator signal generator before the reception slot starts,
The second switching means switches so that a signal input to the quadrature demodulator before the reception slot starts becomes a quadrature modulator output signal,
3. The radio apparatus according to claim 2, wherein the third switching unit performs switching so that the orthogonal demodulator does not perform orthogonal processing before a reception slot starts. An antenna that receives a signal from the outside, a quadrature modulator that performs quadrature modulation processing using a signal output from the local signal generator for transmission, and a local signal for reception of the antenna reception signal received via the antenna Correction value for correcting an amplitude error between the I signal and the Q signal generated by orthogonal demodulation processing of the antenna reception signal by the orthogonal demodulator using the signal output from the transmitter And a gain variable unit that corrects an amplitude error between the I signal and the Q signal using a correction value stored in the storage unit,
A first switching means for switching so that the local oscillator signal generator used by the quadrature modulator is either the transmitting local oscillator generator or the receiving local oscillator generator;
Second switching means for switching so that the signal input to the quadrature demodulator is either the antenna reception signal or the quadrature modulator output signal output from the quadrature modulator;
The local switching signal generator used by the quadrature modulator is switched by the first switching means so as to be the receiving local signal generator, and is input to the quadrature demodulator by the second switching means. The amplitude of the I and Q signals generated by the orthogonal demodulation processing of the orthogonal modulator output signal input to the orthogonal demodulator is detected. Amplitude detection means;
Correction value updating means for updating the correction value stored in the storage unit to a correction value in which the amplitude of the I signal and the amplitude of the Q signal detected by the amplitude detection means are equal to each other. A featured radio circuit. An antenna that receives a signal from the outside, a quadrature modulator that performs quadrature modulation processing using a signal output from the local signal generator for transmission, and a local signal for reception of the antenna reception signal received via the antenna Correction value for correcting an amplitude error between the I signal and the Q signal generated by orthogonal demodulation processing of the antenna reception signal by the orthogonal demodulator using the signal output from the transmitter A radio circuit control method for controlling a radio circuit having a storage unit that stores the gain and a gain variable unit that corrects an amplitude error between the I signal and the Q signal using a correction value stored in the storage unit,
A first switching step of switching so that a local oscillator signal generator used by the quadrature modulator is either the transmitting local oscillator signal generator or the receiving local oscillator signal generator;
A second switching step for switching so that the signal input to the quadrature demodulator is either the antenna reception signal or the quadrature modulator output signal output from the quadrature modulator;
The local signal generator used by the quadrature modulator is switched to become the reception local signal generator by the first switching step, and is input to the quadrature demodulator by the second switching step. The amplitude of the I and Q signals generated by the orthogonal demodulation processing of the orthogonal modulator output signal input to the orthogonal demodulator is detected. An amplitude detection step;
A correction value updating step for updating the correction value stored in the storage unit to a correction value in which the amplitude of the I signal and the amplitude of the Q signal detected by the amplitude detection step are equal to each other. A method of controlling a radio circuit.

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