CN211481269U - Frequency signal processing circuit - Google Patents
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- CN211481269U CN211481269U CN202020599085.0U CN202020599085U CN211481269U CN 211481269 U CN211481269 U CN 211481269U CN 202020599085 U CN202020599085 U CN 202020599085U CN 211481269 U CN211481269 U CN 211481269U
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Abstract
The utility model discloses a frequency signal processing circuit, including frequency modulation receiving module and radio frequency transceiver module, frequency modulation receiving module is connected with frequency selection network, kernel voltage supply end, frequency modulation output circuit and frequency modulation enable end, is connected through middle resonance circuit between frequency selection network and the radio frequency transceiver module, and the frequency selection network is used for receiving frequency modulation signal and carrying out preliminary frequency channel screening, and inputs the frequency modulation signal after screening into frequency modulation receiving module; the frequency modulation output circuit receives the frequency modulation signal of the frequency modulation receiving module, blocks direct current and outputs the frequency modulation signal; the frequency modulation enabling end receives an activation signal of the mobile phone main chip and sends the activation signal to the frequency modulation receiving module; the frequency modulation receiving module receives the frequency modulation signal of the frequency selection network, amplifies the frequency modulation signal and outputs the frequency modulation signal from the frequency modulation output circuit; effective frequency in the input signal is effectively screened out through screening of the resonant circuit, and efficiency of suppressing useless frequency components in frequency selection is improved.
Description
Technical Field
The utility model relates to a function cell-phone frequency processing field specifically is frequency signal processing circuit.
Background
In the field of functional mobile phones, fm broadcasting is an important application direction, so a corresponding fm receiver for receiving fm is equipped on a functional mobile phone, and a received signal needs to be amplified to receive clear and stable fm content, the amplified fm signal causes instability of circuit voltage, and since a radio frequency signal is needed to perform wireless data communication and propagation of digital audio and digital images, a corresponding radio frequency signal transceiver needs to be arranged inside the functional mobile phone to perform transceiving and processing of the radio frequency signal, in the prior art, only a radio frequency transceiver is usually adopted to perform pure signal receiving and transmitting, errors often occur in application of the radio frequency signal, although in the prior art, frequency selection, frequency reduction, demodulation and preliminary signal restoration can be performed inside the radio frequency transceiver, too many useless signals are easily extruded in the space inside the radio frequency transceiver, resulting in a significant reduction in the efficiency of the radio frequency signal transmission. Therefore, on the basis of integrating the frequency modulation signal and the radio frequency signal, how to suppress the useless frequency component during frequency selection becomes a problem to be solved urgently in the field of frequency processing of functional mobile phones.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art and restrain the lower not enough of efficiency of useless frequency component when the selection frequently, provide a frequency signal processing circuit, through resonant tank's screening is effectual to be screened out the effective frequency in the input signal, the efficiency of useless frequency component is restrained when improving the selection frequently.
The purpose of the utility model is mainly realized through the following technical scheme:
the frequency signal processing circuit comprises a frequency modulation receiving module and a radio frequency transceiving module, wherein the frequency modulation receiving module is connected with a frequency selection network, a kernel voltage supply end, a frequency modulation output circuit and a frequency modulation enabling end, the frequency selection network is connected with the radio frequency transceiving module, the frequency modulation receiving module is connected with the radio frequency transceiving module,
the frequency selection network is used for receiving the frequency modulation signals, carrying out primary frequency band screening and inputting the screened frequency modulation signals into the frequency modulation receiving module;
the kernel voltage supply end is used for providing working voltage for the frequency modulation receiving amplifier;
the frequency modulation output circuit receives the frequency modulation signal of the frequency modulation receiving module, blocks direct current and outputs the frequency modulation signal;
the frequency modulation enabling end receives an activation signal of the mobile phone main chip and sends the activation signal to the frequency modulation receiving module;
the frequency modulation receiving module receives the frequency modulation signal of the frequency selection network, amplifies the frequency modulation signal and outputs the frequency modulation signal from the frequency modulation output circuit;
the frequency selection network is connected with an input pin of the frequency modulation receiving module, the kernel voltage supply end is connected with a power supply pin of the frequency modulation receiving module, the frequency modulation output circuit is connected with an output pin of the frequency modulation receiving module, the frequency modulation enabling end is connected with an enabling pin of the frequency modulation receiving module, a voltage stabilizing circuit is arranged on a line between the kernel voltage supply end and the power supply pin of the frequency modulation receiving module, a grounding pin of the frequency modulation receiving module is grounded, the frequency signal processing circuit further comprises a resistor R14, and two ends of the resistor R14 are respectively connected with the input pin and the output pin of the frequency modulation receiving module; be equipped with middle resonant circuit between frequency-selective network and the radio frequency transceiver module, middle resonant circuit includes earthing switch, resistance R23, resistance R101, resistance R102, electric capacity C130 and inductance L109 are parallelly connected, and electric capacity C130 and inductance L109 constitute the branch circuit that connects in parallel, and the one end and the frequency-selective network of branch circuit that connects in parallel are connected, and its other end is connected with resistance R23 and earthing switch in proper order, resistance R101 one end connect resistance R23 with on the circuit between the branch circuit that connects in parallel, its other end ground connection, resistance R102 one end is connected on the circuit between resistance R23 and earthing switch, and its other end ground connection.
In the utility model, in order to ensure that the functional mobile phone can stably and effectively receive the frequency modulation signal, the frequency selection network is arranged to carry out preliminary screening of frequency bands, the screened signal is input into the frequency modulation receiving module through the output pin of the frequency modulation receiving module, the frequency modulation receiving module amplifies the small signal and outputs the frequency modulation signal to the main chip through the frequency modulation output circuit for further processing, the whole frequency modulation amplifier is powered by the inner core voltage supply end, the inner core voltage supply end is the chip inner core voltage, so the utility model mainly depends on the inner core voltage of the chip to supply power, the frequency modulation enable end in the utility model mainly plays the role of being responsible for the input and output of the control signal, the feeding and the disconnection of the frequency modulation signal are controlled through the frequency modulation enable end, because the inner core voltage supply end provides the chip inner core voltage, in order to ensure the voltage stability of the frequency modulation receiving amplifier, a voltage stabilizing circuit is arranged, the voltage stabilizing circuit can stabilize the voltage of the frequency modulation amplifier, thereby ensuring the stability and effectiveness of frequency modulation signal transmission, the utility model discloses in stabilize the voltage of the frequency modulation receiving amplifier through setting up the voltage stabilizing circuit, thereby ensuring that clear and stable frequency modulation content can be received, and the utility model provides a middle simple resonance circuit through the resonance circuit that electric capacity C130 and inductance L109 are parallelly connected and produced, through the resonance circuit effectual useless frequency component of suppressing when frequency selection, improve the frequency selection efficiency, and resistance R102 and resistance R101 are all grounded, play the effect of filtering, and the earthing switch can endure the electric current for a certain time so that the load current does not pass, has protected frequency selection network and middle resonance circuit; the principle is that the resistor consumes ringing power, and can also be considered as reducing the Q value of the transmission line, the resistor is arranged on a signal line with higher requirements for signal integrity, and because the design of the integrated circuit always has a stable time and a holding time, the ringing phenomenon can be eliminated through the consumption of the resistor R14.
Further, the voltage stabilizing circuit comprises a capacitor C134, one end of the capacitor C134 is connected to a line between a power supply pin of the fm receiving module and the core voltage supply terminal, and the other end of the capacitor C134 is grounded. The capacitor C134 is a voltage-stabilizing capacitor of the frequency modulation receiving module, voltage stabilization is performed by utilizing the charge-discharge principle of the capacitor, when the voltage of the inner core is higher than the voltage at two ends of the capacitor, the power supply charges the capacitor, the voltage at two ends of the capacitor is kept unchanged, when the voltage of the inner core is lower than the voltage at two ends of the capacitor, the capacitor discharges to the frequency modulation receiving module, so that the voltage of the frequency modulation receiving module is kept stable, the voltage-stabilizing capacitor is grounded, the redundant voltage can be led out, high-frequency fluctuation of an electrifying signal can be filtered, and the voltage supply of.
Further, the frequency selection network includes an inductor L111, an inductor L112, an inductor L113, a capacitor C132, and a capacitor C133, the inductor L113, and the inductor L111 are sequentially connected in series, the other end of the capacitor C133, which is connected to the end of the inductor L113, is connected to an input pin of the frequency modulation receiving module, the other end of the inductor L111, which is connected to the end of the inductor L113, is used for inputting a frequency modulation signal, the inductor L112 is connected to the capacitor C132 in parallel, the inductor L112 and the capacitor C132 form a second parallel branch, one end of the second parallel branch is connected to a line between the inductor L113 and the inductor L111, and the other end of the second parallel branch. The utility model discloses a frequency-selective network tentatively selects suitable frequency modulation frequency channel to spread into frequency modulation receiving module from frequency modulation receiving module's output pin with the frequency channel of selecting, electric capacity C132 and inductance L112 parallelly connected formation resonant circuit in the frequency-selective network, form the selection to high frequency signal through electric capacity C132 and inductance L112 parallelly connected, the utility model discloses can be through effectual frequency channel screening, effectively screen the frequency modulation signal who receives.
Furthermore, the frequency modulation output circuit comprises a capacitor C135, one end of the capacitor C135 is connected with an output pin of the frequency modulation receiving module, and the other end of the capacitor C135 is connected with a frequency modulation receiving end of the mobile phone main chip. Electric capacity C135 is isolation electric capacity, can follow the DC circuit through isolation electric capacity and keep apart essence safety circuit and non essence safety circuit the utility model discloses in, isolation electric capacity C135 can utilize the nature of condenser "leading to exchange, separate the direct current", forms the resistance-capacitance coupling between frequency modulation receiving module and main chip for do not have the relation on the direct current between main chip and the frequency modulation receiving module, make the frequency modulation output stable effective.
Further, the radio frequency transceiver module is respectively connected with a second frequency selection network, an isolation circuit, an 1800/1900MHz mode conversion circuit and a 850/900MHz mode conversion circuit,
the second frequency selection network receives the signals sent by the frequency selection network of the frequency modulation receiving module, screens out useful frequency band signals and inputs the useful frequency band signals into the radio frequency transceiving module;
the isolation circuit receives the high-frequency band signal and the low-frequency band signal which are primarily processed by the main chip of the mobile phone, performs filtering processing, and then sends the high-frequency band signal and the low-frequency band signal to the radio frequency transceiving module;
the 1800/1900MHz mode switching circuit is used for receiving 1800/1900MHz signals sent by the radio frequency transceiver module, converting the signals into high-frequency differential signals and then sending the converted high-frequency differential signals to the main chip end of the mobile phone;
the 850/900MHz mode conversion circuit receives 850/900MHz signals sent out from the radio frequency transceiving module, converts the signals into low-frequency differential signals, and then sends the converted low-frequency differential signals to the main chip end of the mobile phone;
the radio frequency transceiving module receives the high-frequency band signal and the low-frequency band signal which are processed by the isolation circuit, carries out carrier modulation and power amplification on the high-frequency band signal and the low-frequency band signal, and transmits the processed signals out of the radio frequency transceiving module; receiving a second frequency-selecting network signal, performing frequency selection, frequency reduction, demodulation and preliminary signal reduction processing on the signal, respectively sending the processed signal to an 1800/1900MHz mode conversion circuit and a 850/900MHz mode conversion circuit, converting the signal into a high-frequency differential signal through the 1800/1900MHz mode conversion circuit, sending the high-frequency differential signal to a main chip end of the mobile phone, converting the signal into a low-frequency differential signal through the 850/900MHz mode conversion circuit, and sending the low-frequency differential signal to the main chip end of the mobile phone;
the radio frequency transceiver module is also connected with a resistor R104, the other end of the resistor R104, which is opposite to the end connected with the radio frequency transceiver module, is connected to a base station signal receiving end of a main chip of the mobile phone, and a grounding capacitor C121 is also arranged on a line between the resistor R104 and the radio frequency transceiver module; the radio frequency transceiving module is also connected with a control signal receiving end, and the control signal receiving end receives a control signal of the mobile phone main chip and sends the control signal to the radio frequency transceiving module; the radio frequency transceiver module is also connected with a power supply, and a grounding capacitor C107 and a grounding capacitor C108 are also arranged between the power supply and the radio frequency transceiver module.
The utility model discloses in, the radio frequency receiving and dispatching mainly divide into the flow of receiving and transmitting and amplifying, wherein the flow of receiving is that the signal that middle simple resonant circuit sent is earlier screened out useful frequency range signal by the second frequency selection network, radio frequency receiving and dispatching module has the ANT foot, useful frequency range signal enters into radio frequency receiving and dispatching module through radio frequency receiving and dispatching module's ANT foot and handles, radio frequency receiving and dispatching module's inside is frequency-selective to the signal, frequency reduction, demodulation, preliminary signal reduction, 1800/1900MHz frequency range signal is converted into the high frequency difference signal by 1800/1900MHz mode converting circuit, send the high frequency difference signal to mobile phone owner chip end and carry out further processing, 850/900MHz frequency range signal is converted into the low frequency difference signal by 850/900MHz mode converting circuit, send the low frequency difference signal to mobile phone owner chip end and carry out further processing; in the transmitting and amplifying process, the signal after being processed by the main chip of the mobile phone is received, the high-frequency band signal and the low-frequency band signal are transmitted to the radio frequency transceiver module for processing through the filtering processing of the isolation circuit, the radio frequency transceiver module carries out the carrier modulation, the power amplification and the like on the high-frequency band signal and the low-frequency band signal and then transmits the signals from the ANT pin of the radio frequency transceiver module, the power amplification factor is mainly adjusted by the signal receiving end of the base station according to the strength of the received base station signal so as to achieve the optimal power consumption, the frequency band selection is to carry out adaptation according to the received network condition through the control signal received by the signal receiving end, the signal transmitted by an external mobile phone is screened through a second frequency selection network, and the signal at the main chip end of the mobile phone is processed through the 850/900MHz mode conversion, the effectual signal processing pressure that has reduced radio frequency transceiver module the utility model discloses in handle screening radio frequency signal through sub-band, reduce the operating pressure of radio frequency transceiver, improve the work efficiency of radio frequency transceiver.
Furthermore, the 1800/1900MHz mode converting circuit includes a capacitor C4, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C66, a capacitor C67, an inductor L4, an inductor L7, and an inductor L108, where two ends of the capacitor C67 are respectively connected to the inductor L108 and the radio frequency transceiver module, the other end of the inductor L108 opposite to the end connected to the capacitor C67 serves as a first high-frequency output terminal, one end of the capacitor C4 is connected to one end of the inductor L108 serving as a first high-frequency band signal output terminal, and the other end is grounded, a first node is disposed on a line connecting the capacitor C67 and the inductor L108, one end of the capacitor C8 is connected to the first node, the other end of the capacitor C66 serves as a second high-frequency output terminal, one end of the capacitor C66 is connected to the first node; the inductor L7 is connected with the capacitor C6 in series, the other end of the inductor L7, which is opposite to the end connected with the capacitor C6, is connected with one end of the capacitor C8, which serves as a second high-frequency wave band signal output end, and the other end of the capacitor C6 is grounded; the capacitor C7 is connected in series with the inductor L4, the other end of the capacitor C7, which is opposite to the end connected with the inductor L4, is connected to a line between the capacitor C67 and the radio frequency transceiver module, and the other end of the inductor L4, which is opposite to the end connected with the capacitor C7, is grounded; the 850/900MHz mode converting circuit includes a capacitor C105, a capacitor C63, a capacitor C65, a capacitor C129, a capacitor C5, a capacitor C64, an inductor L10, an inductor L3, and an inductor L2, wherein two ends of the capacitor C64 are respectively connected to the inductor L2 and the radio frequency transceiver module, the other end of the inductor L2 opposite to the end of the capacitor C64 is used as a first low frequency output end, one end of the capacitor C105 is connected to one end of the inductor L2 which is used as a first low frequency band signal output end, the other end of the capacitor C64 is grounded, a second node is arranged on a line connecting the capacitor C2 and the inductor L2, one end of the capacitor C129 is connected to the second node, the other end of the capacitor C129 is used as a second low frequency output end, one end of the capacitor C5 is; the inductor L3 is connected in series with the capacitor C63, the other end of the inductor L3, which is opposite to the end connected with the capacitor C63, is connected with one end of the capacitor C129 serving as a second low-frequency waveband signal output end, and the other end of the capacitor C63 is grounded; the capacitor C65 is connected in series with the inductor L10, the other end of the capacitor C65 opposite to the end connected with the inductor L10 is connected to a line between the capacitor C64 and the radio frequency transceiver module, and the other end of the inductor L10 opposite to the end connected with the capacitor C65 is grounded.
Because the mode conversion circuit has the advantages of wide frequency band, high conversion rate, low energy consumption and good high-frequency performance, the utility model adopts the mode conversion circuit to process 1800/1900MHz and 850/900MHz wave band signals, namely signals of an HB-RX end and an LB-RX end, and transmit the signals to a main chip end of the mobile phone, the main chip end of the mobile phone is a main chip of the functional mobile phone, is adapted to all mobile phone chips capable of receiving 1800/1900MHz and 850/900MHz signals, receives the signals from an HB-RX end and an LB-RX end of a radio frequency transceiving module, separates and converts the signals output from the HB-RX end and the LB-RX end into high-frequency wave band differential signals under the combined action of each capacitance inductor, and the first high-frequency wave band signal, namely the signal of the HB-RX N end, and the second high-frequency wave band signal, namely the signal of the HB-RX P end, the first low-frequency band signal, namely a signal of an LB-RX N end and the second low-frequency band signal, namely a signal of an LB-RX P end are output through different output ends, the output high-frequency band differential signal enters a main chip of the mobile phone from the HB-RX N end and the HB-RX P end for further processing, and the output low-frequency band differential signal enters the main chip of the mobile phone from the LB-RX N end and the LB-RX P end for further processing.
Further, the isolation circuit comprises a capacitor C59, a capacitor C60, a capacitor C61, a capacitor C62, a capacitor C120, a capacitor C109, a resistor R26 and a resistor R27, wherein the capacitor C120 and the resistor R27 are connected in series, the other end of the capacitor C120, which is opposite to the end connected with the resistor R27, is used as a high-frequency band signal input end, and the other end of the resistor R27, which is opposite to the end connected with the capacitor C120, is connected with the radio frequency transceiver module; one end of the capacitor C62 is connected to a line between the capacitor C120 and the resistor R27, the other end of the capacitor C62 is grounded, one end of the capacitor C61 is connected to a line between the resistor R27 and the radio frequency transceiver module, and the other end of the capacitor C61 is grounded; the capacitor C109 is connected with the resistor R26 in series, the other end of the capacitor C109, which is opposite to the end connected with the resistor R26, is used as a low-frequency waveband signal input end, and the other end of the resistor R26, which is opposite to the end connected with the capacitor C109, is connected with the radio frequency transceiving module; one end of the capacitor C60 is connected to the line between the capacitor C109 and the resistor R26, and the other end thereof is grounded, and one end of the capacitor C59 is connected to the line between the resistor R26 and the rf transceiver module, and the other end thereof is grounded.
The utility model discloses in keep apart HB-TX signal and low frequency band signal LB-TX signal input and radio frequency transceiver module through the high frequency band signal of isolating circuit with the cell-phone owner chip promptly, get rid of the interference to high frequency band signal HB-TX signal and low frequency band signal LB-TX signal through isolating circuit's effect, make radio frequency transceiver module can obtain stable effectual signal input, through electric capacity C59, electric capacity C60, electric capacity C61 and electric capacity C62's filtering action, make the clutter of HB-TX signal and LB-TX signal of inputing among the radio frequency transceiver module eliminated.
Furthermore, the control signal receiving end comprises a PA-EN connection point, a first control signal input end and a second control signal input end, the PA-EN connection point is connected with the radio frequency transceiving module, and a grounding capacitor C56 is arranged on a circuit between the PA-EN connection point and the radio frequency transceiving module; the first control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C57 is arranged on a line between the first control signal input end and the radio frequency transceiving module; the second control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C58 is arranged on a line between the second control signal input end and the radio frequency transceiving module.
The utility model provides a PA-EN tie point connects amplifier circuit, make radio frequency transceiver module's signal amplification, control signal divide into first control signal CTR-BS1 and second control signal CTR-BS2 promptly, the last pin of radio frequency transceiver module is CTRL1 and CTRL0, and CTRL1 and CTRL-BS 2 are through the mode in sending received control signal to radio frequency transceiver module, make the frequency channel of radio frequency transceiver module can effectual selection adaptation, thereby the effectual function of realizing frequency selection of help radio frequency transceiver module, in the control signal receiving terminal, electric capacity C56, electric capacity C57 and electric capacity C58 all ground connection, the effect of filtering is all played to this three electric capacity, can effectual filtering clutter, with control signal and the stable effectual conveying of amplifying signal.
Further, the second frequency-selecting network comprises an inductor L103 and an inductor L8 which are connected in series, the other end of the inductor L103, which is connected with the end of the inductor L8, is connected with the radio frequency transceiver module, the other end of the inductor L8, which is connected with the end of the inductor L103, is connected with the intermediate resonant circuit, a ground capacitor C2 is connected on a line between the inductor L103 and the inductor L8, and a ground capacitor C1 is arranged on a line between the inductor L8 and the intermediate resonant circuit. The utility model discloses an inductance L103 and inductance L8 of establishing ties play the filtering action to the signal that the frequency-selecting network sent for the current signal input radio frequency transceiver module of suitable frequency, and electric capacity C2 and electric capacity C1 filtering clutter in the frequency-selecting network, further alleviate radio frequency transceiver module's operating pressure.
To sum up, compared with the prior art, the utility model has the following beneficial effects:
(1) through setting up voltage stabilizing circuit, voltage stabilizing circuit can get off frequency modulation amplifier's voltage stabilization to guarantee that frequency modulation signal transmission's is stable effective, the utility model discloses in stabilize frequency modulation receiving amplifier's voltage through setting up voltage stabilizing circuit, thereby the guarantee can receive clear stable frequency modulation content.
(2) The high-frequency signal and the low-frequency signal are transmitted into the radio frequency transceiver module through the isolation circuit for processing, the radio frequency transceiver module performs carrier modulation, power amplification and other processing on the high-frequency signal and the low-frequency signal and then transmits the high-frequency signal and the low-frequency signal from an ANT pin of the radio frequency transceiver module, the isolation circuit performs filtering and then transmits the high-frequency signal and the low-frequency signal, the radio frequency transceiver module can receive stable and reliable mobile phone main chip signals, and the working pressure of the radio frequency transceiver module is reduced.
(3) The utility model provides a well simple resonant circuit passes through the parallelly connected resonant circuit who produces of electric capacity C130 and inductance L109, through resonant circuit effectual when the selection frequently restraines useless frequency component, improves the selection efficiency frequently.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic circuit diagram of the present invention;
fig. 2 is a schematic diagram of the rf transceiver module according to the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1:
as shown in fig. 1, the FM receiving module in this embodiment adopts an FM receiving amplifier with model number LNAS7177, which is mainly used to amplify the received FM signal, and the FM-SANT interface, the FM-EN terminal, and the core voltage supply terminal VDDIO-2 are all connected to a main chip of the functional mobile phone, and the main chip has model number ASIC-SC 6531F-175-0.4.
The frequency signal processing circuit in the embodiment comprises a frequency modulation receiving module and a radio frequency transceiving module, wherein the frequency modulation receiving module is connected with a frequency selection network, a kernel voltage supply end, a frequency modulation output circuit and a frequency modulation enabling end, the frequency selection network is connected with the radio frequency transceiving module, and concretely,
the frequency selection network is used for receiving the frequency modulation signals, carrying out primary frequency band screening and inputting the screened frequency modulation signals into the frequency modulation receiving module; the frequency selection network comprises an inductor L111, an inductor L112, an inductor L113, a capacitor C132 and a capacitor C133, wherein the capacitor C133, the inductor L113 and the inductor L111 are sequentially connected in series, the other end of the capacitor C133, which is connected with the end of the inductor L113, is connected with an input pin of the frequency modulation receiving module, the other end of the inductor L111, which is connected with the end of the inductor L113, is used for inputting frequency modulation signals, the inductor L112 is connected with the capacitor C132 in parallel, the inductor L112 and the capacitor C132 form a second parallel branch, one end of the second parallel branch is connected to a line between the inductor L113 and the inductor L111, and the other end of the second parallel branch.
The kernel voltage supply end is used for providing working voltage for the frequency modulation receiving amplifier;
the frequency modulation output circuit receives the frequency modulation signal of the frequency modulation receiving module, blocks direct current and outputs the frequency modulation signal; the frequency modulation output circuit comprises a capacitor C135, one end of the capacitor C135 is connected with an output pin of the frequency modulation receiving module, and the other end of the capacitor C135 is connected with a frequency modulation receiving end of the mobile phone main chip.
The frequency modulation enabling end receives an activation signal of the mobile phone main chip and sends the activation signal to the frequency modulation receiving module;
the frequency modulation receiving module receives the frequency modulation signal of the frequency selection network, amplifies the frequency modulation signal and outputs the frequency modulation signal from the frequency modulation output circuit; the embodiment further includes a resistor R14, and two ends of the resistor R14 are respectively connected to the input pin and the output pin of the fm receiver module.
The frequency selection network is connected with an input pin of the frequency modulation receiving module, the kernel voltage supply end is connected with a power supply pin of the frequency modulation receiving module, the frequency modulation output circuit is connected with an output pin of the frequency modulation receiving module, the frequency modulation enabling end is connected with an enabling pin of the frequency modulation receiving module, a voltage stabilizing circuit is arranged on a line between the kernel voltage supply end and the power supply pin of the frequency modulation receiving module, a grounding pin of the frequency modulation receiving module is grounded, the frequency signal processing circuit further comprises a resistor R14, and two ends of the resistor R14 are respectively connected with the input pin and the output pin of the frequency modulation receiving module; be equipped with middle resonant circuit between frequency-selective network and the radio frequency transceiver module, middle resonant circuit includes earthing switch, resistance R23, resistance R101, resistance R102, electric capacity C130 and inductance L109 are parallelly connected, and electric capacity C130 and inductance L109 constitute the branch circuit that connects in parallel, and the one end and the frequency-selective network of branch circuit that connects in parallel are connected, and its other end is connected with resistance R23 and earthing switch in proper order, resistance R101 one end connect resistance R23 with on the circuit between the branch circuit that connects in parallel, its other end ground connection, resistance R102 one end is connected on the circuit between resistance R23 and earthing switch, and its other end ground connection.
In this embodiment, the frequency modulation signal is subjected to preliminary frequency band screening through a frequency selection network composed of an inductor L111, an inductor L112, a capacitor C132, an inductor L113, and a capacitor C133, then the screened signal is input through an output pin of the frequency modulation receiving module, a small signal is amplified through the frequency modulation receiving module and then output through an input pin, and then the small signal is transmitted to the main control chip through an FM-SANT interface of the main control chip through an isolation capacitor C135 for processing, and the capacitor C134 is a voltage stabilizing capacitor of the frequency modulation receiving module to stabilize the working voltage of the frequency modulation receiving module.
Example 2:
as shown in fig. 1-2, the present embodiment relates to a radio frequency transceiver module based on embodiment 1, the radio frequency transceiver module is respectively connected with a second frequency selection network, an isolation circuit, an 1800/1900MHz mode conversion circuit and a 850/900MHz mode conversion circuit, wherein,
the second frequency-selecting network receives signals sent by an external mobile phone, screens out useful frequency band signals through the second frequency-selecting network and inputs the useful frequency band signals into the radio frequency transceiving module;
the isolation circuit receives the high-frequency band signal and the low-frequency band signal which are primarily processed by the main chip of the mobile phone and sends the high-frequency band signal and the low-frequency band signal to the radio frequency transceiving module;
the 1800/1900MHz mode conversion circuit receives 1800/1900MHz signals of the radio frequency transceiver module, converts the signals into high-frequency differential signals, and sends the converted high-frequency differential signals to the main chip end of the mobile phone; the 1800/1900MHz mode conversion circuit comprises a capacitor C4, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C66, a capacitor C67, an inductor L4, an inductor L7 and an inductor L108, wherein two ends of the capacitor C67 are respectively connected with the inductor L108 and the radio frequency transceiver module, the other end of the inductor L108, which is opposite to the end connected with the capacitor C67, is used as a first high-frequency output end, one end of the capacitor C4 is connected with one end of the inductor L108, which is used as a first high-frequency waveband signal output end, the other end of the capacitor C67 is grounded, a circuit connected with the inductor L108 is provided with a first node, one end of the capacitor C8 is connected with the first node, the other end of the capacitor C66 is used as a second high-frequency output end, one end of the capacitor; the inductor L7 is connected with the capacitor C6 in series, the other end of the inductor L7, which is opposite to the end connected with the capacitor C6, is connected with one end of the capacitor C8, which serves as a second high-frequency wave band signal output end, and the other end of the capacitor C6 is grounded; the capacitor C7 is connected in series with the inductor L4, the other end of the capacitor C7 opposite to the end connected with the inductor L4 is connected to a line between the capacitor C67 and the radio frequency transceiver module, and the other end of the inductor L4 opposite to the end connected with the capacitor C7 is grounded.
The 850/900MHz mode conversion circuit receives 850/900MHz signals in the radio frequency transceiving module, converts the signals into low-frequency differential signals and sends the converted low-frequency differential signals to the main chip end of the mobile phone; the 850/900MHz mode converting circuit includes a capacitor C105, a capacitor C63, a capacitor C65, a capacitor C129, a capacitor C5, a capacitor C64, an inductor L10, an inductor L3, and an inductor L2, wherein two ends of the capacitor C64 are respectively connected to the inductor L2 and the radio frequency transceiver module, the other end of the inductor L2 opposite to the end of the capacitor C64 is used as a first low frequency output end, one end of the capacitor C105 is connected to one end of the inductor L2 which is used as a first low frequency band signal output end, the other end of the capacitor C64 is grounded, a second node is arranged on a line connecting the capacitor C2 and the inductor L2, one end of the capacitor C129 is connected to the second node, the other end of the capacitor C129 is used as a second low frequency output end, one end of the capacitor C5 is; the inductor L3 is connected in series with the capacitor C63, the other end of the inductor L3, which is opposite to the end connected with the capacitor C63, is connected with one end of the capacitor C129 serving as a second low-frequency waveband signal output end, and the other end of the capacitor C63 is grounded; the capacitor C65 is connected in series with the inductor L10, the other end of the capacitor C65 opposite to the end connected with the inductor L10 is connected to a line between the capacitor C64 and the radio frequency transceiver module, and the other end of the inductor L10 opposite to the end connected with the capacitor C65 is grounded.
The radio frequency transceiving module receives the high-frequency band signal and the low-frequency band signal which are processed by the isolation circuit, carries out carrier modulation and power amplification processing on the high-frequency band signal and the low-frequency band signal, transmits the processed signals out of the radio frequency transceiving module, receives a second frequency selection network signal, carries out frequency selection, frequency reduction, demodulation and preliminary signal reduction processing on the signals, respectively transmits the processed signals to the 1800/1900MHz mode conversion circuit and the 850/900MHz mode conversion circuit, converts the signals into high-frequency differential signals through the 1800/1900MHz mode conversion circuit, transmits the high-frequency differential signals to the main chip end of the mobile phone, converts the signals into low-frequency differential signals through the 850/900MHz mode conversion circuit, and transmits the low-frequency differential signals to the main chip end of the mobile phone.
The type of the radio frequency transceiver module in this embodiment is RF-FEM-SC26 2631H, VBAT is a power module in the prior art, the main chip end of the mobile phone, to which the first high-frequency band signal HB-RX N, the second high-frequency band signal HB-RX P, the first low-frequency band signal LB-RX N, and the second low-frequency band signal LB-RX P are input in this embodiment, is a mobile phone chip capable of receiving such signals in the prior art, and the high-frequency band signal HB-TX, the low-frequency band signal LB-TX, the first control signal CTR-BS1, and the second control signal CTR-BS2 are derived from the same main chip of the mobile phone.
Example 3:
as shown in fig. 1-2, in this embodiment, on the basis of embodiment 1, the radio frequency transceiver module is further connected to a resistor R104, one end of the resistor R104, which is connected to the radio frequency transceiver module, is connected to a base station signal receiving end, a ground capacitor C121 is further disposed on a line between the resistor R104 and the radio frequency transceiver module, the radio frequency transceiver module is further connected to a control signal receiving end, the control signal receiving end receives a mobile phone main chip control signal and sends the control signal to the radio frequency transceiver module, the radio frequency transceiver module is further connected to a power supply, and a ground capacitor C107 and a ground capacitor C108 are further disposed between the power supply and the radio frequency transceiver module.
On this basis, the isolation circuit comprises a capacitor C59, a capacitor C60, a capacitor C61, a capacitor C62, a capacitor C120, a capacitor C109, a resistor R26 and a resistor R27, wherein the capacitor C120 is connected with the resistor R27 in series, the other end of the capacitor C120, which is opposite to the end connected with the resistor R27, is used as a high-frequency band signal input end, and the other end of the resistor R27, which is opposite to the end connected with the capacitor C120, is connected with the radio frequency transceiving module; one end of the capacitor C62 is connected to a line between the capacitor C120 and the resistor R27, the other end of the capacitor C62 is grounded, one end of the capacitor C61 is connected to a line between the resistor R27 and the radio frequency transceiver module, and the other end of the capacitor C61 is grounded; the capacitor C109 is connected with the resistor R26 in series, the other end of the capacitor C109, which is opposite to the end connected with the resistor R26, is used as a low-frequency waveband signal input end, and the other end of the resistor R26, which is opposite to the end connected with the capacitor C109, is connected with the radio frequency transceiving module; one end of the capacitor C60 is connected to a line between the capacitor C109 and the resistor R26, the other end of the capacitor C60 is grounded, one end of the capacitor C59 is connected to a line between the resistor R26 and the radio frequency transceiver module, and the other end of the capacitor C59 is grounded; the control signal receiving end comprises a PA-EN connection point, a first control signal input end and a second control signal input end, the PA-EN connection point is connected with the radio frequency transceiving module, and a grounding capacitor C56 is arranged on a circuit between the PA-EN connection point and the radio frequency transceiving module; the first control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C57 is arranged on a line between the first control signal input end and the radio frequency transceiving module; the second control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C58 is arranged on a line between the second control signal input end and the radio frequency transceiving module; the second frequency-selecting network comprises an inductor L103 and an inductor L8 which are connected in series, the other end of the inductor L103, which is opposite to the end connected with the inductor L8, is connected with the radio frequency transceiver module, the other end of the inductor L8, which is opposite to the end connected with the inductor L103, is connected with the intermediate resonant circuit, a grounding capacitor C2 is connected on a line between the inductor L103 and the inductor L8, and a grounding capacitor C1 is arranged on a line between the inductor L8 and the intermediate resonant circuit.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The frequency signal processing circuit is characterized by comprising a frequency modulation receiving module and a radio frequency transceiving module, wherein the frequency modulation receiving module is connected with a frequency selection network, a kernel voltage supply end, a frequency modulation output circuit and a frequency modulation enabling end, the frequency selection network is connected with the radio frequency transceiving module, the frequency modulation receiving module is connected with the radio frequency transceiving module,
the frequency selection network is used for receiving the frequency modulation signals, carrying out primary frequency band screening and inputting the screened frequency modulation signals into the frequency modulation receiving module;
the kernel voltage supply end is used for providing working voltage for the frequency modulation receiving amplifier;
the frequency modulation output circuit receives the frequency modulation signal of the frequency modulation receiving module, blocks direct current and outputs the frequency modulation signal;
the frequency modulation enabling end receives an activation signal of the mobile phone main chip and sends the activation signal to the frequency modulation receiving module;
the frequency modulation receiving module receives the frequency modulation signal of the frequency selection network, amplifies the frequency modulation signal and outputs the frequency modulation signal from the frequency modulation output circuit;
the frequency selection network is connected with an input pin of the frequency modulation receiving module, the kernel voltage supply end is connected with a power supply pin of the frequency modulation receiving module, the frequency modulation output circuit is connected with an output pin of the frequency modulation receiving module, the frequency modulation enabling end is connected with an enabling pin of the frequency modulation receiving module, a voltage stabilizing circuit is arranged on a line between the kernel voltage supply end and the power supply pin of the frequency modulation receiving module, a grounding pin of the frequency modulation receiving module is grounded, the frequency signal processing circuit further comprises a resistor R14, and two ends of the resistor R14 are respectively connected with the input pin and the output pin of the frequency modulation receiving module; be equipped with middle resonant circuit between frequency-selective network and the radio frequency transceiver module, middle resonant circuit includes earthing switch, resistance R23, resistance R101, resistance R102, electric capacity C130 and inductance L109 are parallelly connected, and electric capacity C130 and inductance L109 constitute the branch circuit that connects in parallel, and the one end and the frequency-selective network of branch circuit that connects in parallel are connected, and its other end is connected with resistance R23 and earthing switch in proper order, resistance R101 one end connect resistance R23 with on the circuit between the branch circuit that connects in parallel, its other end ground connection, resistance R102 one end is connected on the circuit between resistance R23 and earthing switch, and its other end ground connection.
2. The frequency signal processing circuit of claim 1, wherein the voltage regulator circuit comprises a capacitor C134, one end of the capacitor C134 is connected to a line between the supply pin of the fm receiver module and the core voltage supply terminal, and the other end of the capacitor C134 is grounded.
3. The frequency signal processing circuit according to claim 1, wherein the frequency selection network includes an inductor L111, an inductor L112, an inductor L113, a capacitor C132, and a capacitor C133, the inductor L113, and the inductor L111 are sequentially connected in series, the other end of the capacitor C133 opposite to the end connected to the inductor L113 is connected to an input pin of the fm receiver module, the other end of the inductor L111 opposite to the end connected to the inductor L113 is used for inputting a fm signal, the inductor L112 is connected in parallel to the capacitor C132, the inductor L112 and the capacitor C132 form a second parallel branch, one end of the second parallel branch is connected to a line between the inductor L113 and the inductor L111, and the other end of the second parallel branch is grounded.
4. The frequency signal processing circuit according to claim 1, wherein the fm output circuit comprises a capacitor C135, one end of the capacitor C135 is connected to the output pin of the fm receiving module, and the other end of the capacitor C135 is connected to the fm receiving end of the mobile phone main chip.
5. The frequency signal processing circuit of claim 1, wherein the RF transceiver module is connected to a second frequency selection network, an isolation circuit, an 1800/1900MHz mode conversion circuit and a 850/900MHz mode conversion circuit, respectively,
the second frequency selection network receives the signals sent by the frequency selection network of the frequency modulation receiving module, screens out useful frequency band signals and inputs the useful frequency band signals into the radio frequency transceiving module;
the isolation circuit receives the high-frequency band signal and the low-frequency band signal which are primarily processed by the main chip of the mobile phone, performs filtering processing, and then sends the high-frequency band signal and the low-frequency band signal to the radio frequency transceiving module;
the 1800/1900MHz mode switching circuit is used for receiving 1800/1900MHz signals sent by the radio frequency transceiver module, converting the signals into high-frequency differential signals and then sending the converted high-frequency differential signals to the main chip end of the mobile phone;
the 850/900MHz mode conversion circuit receives 850/900MHz signals sent out from the radio frequency transceiving module, converts the signals into low-frequency differential signals, and then sends the converted low-frequency differential signals to the main chip end of the mobile phone;
the radio frequency transceiving module receives the high-frequency band signal and the low-frequency band signal which are processed by the isolation circuit, carries out carrier modulation and power amplification on the high-frequency band signal and the low-frequency band signal, and transmits the processed signals out of the radio frequency transceiving module; receiving a second frequency-selecting network signal, performing frequency selection, frequency reduction, demodulation and preliminary signal reduction processing on the signal, respectively sending the processed signal to an 1800/1900MHz mode conversion circuit and a 850/900MHz mode conversion circuit, converting the signal into a high-frequency differential signal through the 1800/1900MHz mode conversion circuit, sending the high-frequency differential signal to a main chip end of the mobile phone, converting the signal into a low-frequency differential signal through the 850/900MHz mode conversion circuit, and sending the low-frequency differential signal to the main chip end of the mobile phone;
the radio frequency transceiver module is also connected with a resistor R104, the other end of the resistor R104, which is opposite to the end connected with the radio frequency transceiver module, is connected to a base station signal receiving end of a main chip of the mobile phone, and a grounding capacitor C121 is also arranged on a line between the resistor R104 and the radio frequency transceiver module; the radio frequency transceiving module is also connected with a control signal receiving end, and the control signal receiving end receives a control signal of the mobile phone main chip and sends the control signal to the radio frequency transceiving module; the radio frequency transceiver module is also connected with a power supply, and a grounding capacitor C107 and a grounding capacitor C108 are also arranged between the power supply and the radio frequency transceiver module.
6. The frequency signal processing circuit according to claim 5, wherein the 1800/1900MHz mode converting circuit comprises a capacitor C4, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C66, a capacitor C67, an inductor L4, an inductor L7 and an inductor L108, two ends of the capacitor C67 are respectively connected with the inductor L108 and the radio frequency transceiver module, the other end of the inductor L108 opposite to the end connected with the capacitor C67 serves as a first high frequency output end, one end of the capacitor C4 is connected with one end of the inductor L108 serving as a first high frequency band signal output end, the other end of the capacitor C67 is grounded, a first node is arranged on a line connecting the capacitor C67 and the inductor L108, one end of the capacitor C8 is connected with the first node, the other end of the capacitor C66 serves as a second high frequency output end, one end of the capacitor C66 is connected with the first node, and the other; the inductor L7 is connected with the capacitor C6 in series, the other end of the inductor L7, which is opposite to the end connected with the capacitor C6, is connected with one end of the capacitor C8, which serves as a second high-frequency wave band signal output end, and the other end of the capacitor C6 is grounded; the capacitor C7 is connected in series with the inductor L4, the other end of the capacitor C7, which is opposite to the end connected with the inductor L4, is connected to a line between the capacitor C67 and the radio frequency transceiver module, and the other end of the inductor L4, which is opposite to the end connected with the capacitor C7, is grounded; the 850/900MHz mode converting circuit includes a capacitor C105, a capacitor C63, a capacitor C65, a capacitor C129, a capacitor C5, a capacitor C64, an inductor L10, an inductor L3, and an inductor L2, wherein two ends of the capacitor C64 are respectively connected to the inductor L2 and the radio frequency transceiver module, the other end of the inductor L2 opposite to the end of the capacitor C64 is used as a first low frequency output end, one end of the capacitor C105 is connected to one end of the inductor L2 which is used as a first low frequency band signal output end, the other end of the capacitor C64 is grounded, a second node is arranged on a line connecting the capacitor C2 and the inductor L2, one end of the capacitor C129 is connected to the second node, the other end of the capacitor C129 is used as a second low frequency output end, one end of the capacitor C5 is; the inductor L3 is connected in series with the capacitor C63, the other end of the inductor L3, which is opposite to the end connected with the capacitor C63, is connected with one end of the capacitor C129 serving as a second low-frequency waveband signal output end, and the other end of the capacitor C63 is grounded; the capacitor C65 is connected in series with the inductor L10, the other end of the capacitor C65 opposite to the end connected with the inductor L10 is connected to a line between the capacitor C64 and the radio frequency transceiver module, and the other end of the inductor L10 opposite to the end connected with the capacitor C65 is grounded.
7. The frequency signal processing circuit according to claim 5, wherein the isolation circuit comprises a capacitor C59, a capacitor C60, a capacitor C61, a capacitor C62, a capacitor C120, a capacitor C109, a resistor R26 and a resistor R27, the capacitor C120 and the resistor R27 are connected in series, the other end of the capacitor C120 opposite to the end connected with the resistor R27 serves as a high-frequency band signal input end, and the other end of the resistor R27 opposite to the end connected with the capacitor C120 is connected with the radio frequency transceiving module; one end of the capacitor C62 is connected to a line between the capacitor C120 and the resistor R27, the other end of the capacitor C62 is grounded, one end of the capacitor C61 is connected to a line between the resistor R27 and the radio frequency transceiver module, and the other end of the capacitor C61 is grounded; the capacitor C109 is connected with the resistor R26 in series, the other end of the capacitor C109, which is opposite to the end connected with the resistor R26, is used as a low-frequency waveband signal input end, and the other end of the resistor R26, which is opposite to the end connected with the capacitor C109, is connected with the radio frequency transceiving module; one end of the capacitor C60 is connected to the line between the capacitor C109 and the resistor R26, and the other end thereof is grounded, and one end of the capacitor C59 is connected to the line between the resistor R26 and the rf transceiver module, and the other end thereof is grounded.
8. The frequency signal processing circuit according to claim 5, wherein the control signal receiving terminal comprises a PA-EN connection point, a first control signal input terminal and a second control signal input terminal, the PA-EN connection point is connected with the rf transceiver module, and a ground capacitor C56 is arranged on a line between the PA-EN connection point and the rf transceiver module; the first control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C57 is arranged on a line between the first control signal input end and the radio frequency transceiving module; the second control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C58 is arranged on a line between the second control signal input end and the radio frequency transceiving module.
9. The frequency signal processing circuit according to claim 5, wherein the second frequency-selective network comprises an inductor L103 and an inductor L8 connected in series, the other end of the inductor L103 opposite to the end connected with the inductor L8 is connected with the radio frequency transceiver module, the other end of the inductor L8 opposite to the end connected with the inductor L103 is connected with the intermediate resonant circuit, a ground capacitor C2 is connected to a line between the inductor L103 and the inductor L8, and a ground capacitor C1 is connected to a line between the inductor L8 and the intermediate resonant circuit.
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| CN202020599085.0U CN211481269U (en) | 2020-04-20 | 2020-04-20 | Frequency signal processing circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112564734A (en) * | 2020-12-01 | 2021-03-26 | 广东宽普科技有限公司 | Short wave signal radio frequency low frequency isolation type transmitting-receiving device |
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| CN112564734A (en) * | 2020-12-01 | 2021-03-26 | 广东宽普科技有限公司 | Short wave signal radio frequency low frequency isolation type transmitting-receiving device |
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