CMOS monolithic integrated military navigation multi-mode multi-frequency multi-channel parallel radio frequency receiving device

Abstract

The present application relates to CMOS monolithic integrated military navigation multi-mode multi-frequency multi-channel parallel radio frequency receiving device, two independent radio frequency receiving channels and second frequency synthesizer of the receiving device, two functional channels of conventional channel and anti-interference channel are integrated in each independent channel, two channels are selected one by one by enabling control, wherein the conventional channel is characterized by high gain, high sensitivity, supports AGC function, outputs digital intermediate frequency and analog intermediate frequency, mainly meets the application needs of conventional navigation;The anti-interference channel is characterized by high linearity and low gain, and outputs analog intermediate frequency, mainly meets the application needs of military anti-jamming navigation, the receiving device of the present application is simple in structure, ensures low power consumption of the chip under high integration, can flexibly switch digital intermediate frequency output and analog intermediate frequency output, and supports various application needs of the system.

Description

Technical Field

[0001] This invention relates to a multi-channel parallel radio frequency receiving method and apparatus, and particularly to a military navigation multi-mode multi-frequency multi-channel parallel radio frequency receiving method and apparatus applied in CMOS low-IF receivers, belonging to the field of radio frequency integrated circuit design technology. Background Technology

[0002] With the official deployment of the BeiDou-2 navigation system, satellite navigation applications have transitioned from the era of single-constellation GPS to the GNSS era, characterized by the coexistence and compatibility of multiple constellations (GPS / GLONASS / Compass / Galileo). Utilizing signals from multiple modes for navigation and positioning can improve the reliability and integrity of the system, as well as enhance positioning accuracy and navigation continuity, representing the development trend of next-generation satellite navigation systems.

[0003] Multi-mode satellite joint navigation not only places higher demands on digital baseband algorithms but also presents greater challenges to the design of radio frequency receiver chips. Furthermore, military navigation has specific anti-jamming application requirements, so the radio frequency chip must not only possess a parallel architecture to support multi-mode joint navigation but also meet the diverse functional application needs of conventional navigation and military anti-jamming navigation.

[0004] Currently, mainstream RF navigation chips are mainly single-channel or designed for single application needs, and cannot effectively support multi-mode satellite joint navigation. There is still no effective single-chip solution to meet the multi-channel parallel processing and multi-application requirements of future multi-mode satellite joint navigation. Therefore, researching multi-mode, multi-frequency, and multi-channel parallel RF receiving methods based on CMOS monolithic integration to meet the application needs of multi-mode satellite joint navigation is of great significance. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide a CMOS monolithically integrated military navigation multi-mode multi-frequency multi-channel parallel radio frequency receiver. This receiver has a simple structure, ensures low power consumption of the chip under high integration, and can flexibly switch between digital intermediate frequency output and analog intermediate frequency output to support various application needs of the system.

[0006] The above-mentioned objectives of the present invention are mainly achieved through the following technical solutions:

[0007] This CMOS monolithically integrated military navigation multi-mode multi-frequency multi-channel parallel RF receiver includes two independent RF receiving channels and a second frequency synthesizer. The second frequency synthesizer generates a programmable sampling clock signal. Each independent RF receiving channel includes a high-linearity low-noise amplifier, a passive mixer, a high-linearity filter, a first intermediate frequency amplifier, a switch, a high-gain low-noise amplifier, an active mixer, an intermediate frequency filter, a second intermediate frequency amplifier, a variable gain amplifier, an analog-to-digital converter controller, an automatic gain controller, an automatic frequency controller, an automatic amplitude and phase calibrator, and the first frequency synthesizer.

[0008] The high-linearity low-noise amplifier, passive mixer, high-linearity filter, and first intermediate frequency amplifier form the anti-interference channel; the high-gain low-noise amplifier, active mixer, intermediate frequency filter, second intermediate frequency amplifier, variable gain amplifier, analog-to-digital converter controller, and automatic gain controller form the conventional channel. The functions of each module are as follows:

[0009] High linearity low noise amplifier: Receives external navigation signals, processes them through the high linearity low noise amplifier, and outputs the processed signal to the passive mixer;

[0010] Passive mixer: Receives the signal output from the high linearity low noise amplifier and the local carrier signal generated by the first frequency synthesizer, performs frequency mixing on the two signals, converts them into a down-converted signal, and outputs the down-converted signal to the high linearity filter;

[0011] High linearity filter: Receives the signal output from the passive mixer, performs high linearity filtering to filter out interference signals, and outputs the filtered intermediate frequency signal to the first intermediate frequency amplifier;

[0012] First intermediate frequency amplifier: Receives the intermediate frequency signal output from the high linearity filter, amplifies it, and then outputs the amplified signal to the switch;

[0013] High-gain low-noise amplifier: The navigation signal received from the outside is processed by the high-gain low-noise amplifier, and the processed signal is output to the active filter;

[0014] Active mixer: Receives the signal output from the high-gain low-noise amplifier and the local carrier signal generated by the first frequency synthesizer, mixes the two signals to convert them into a down-converted signal, performs automatic amplitude and phase calibration, and outputs the calibrated signal to the intermediate frequency filter;

[0015] Intermediate frequency filter: Receives the signal output from the active mixer, performs intermediate frequency filtering on the signal, and outputs it to the second intermediate frequency amplifier;

[0016] Second intermediate frequency amplifier: After receiving the signal output from the intermediate frequency filter and performing gain amplification processing, the signal is output to the variable gain amplifier;

[0017] Variable gain amplifier: forwards the signal received from the second intermediate frequency amplifier to the analog-to-digital converter controller, and at the same time adjusts the signal gain of the signal received from the second intermediate frequency amplifier under the control of the automatic gain controller, and outputs the gain-adjusted signal to the switch;

[0018] Analog-to-digital converter controller: Receives signals from the variable gain amplifier, converts analog signals into digital signals, and outputs the converted digital signals to the automatic gain controller;

[0019] Automatic gain controller: Receives the digital signal output from the analog-to-digital converter controller and adjusts the gain according to the digital signal...

[0020] The level of the voltage level controls the gain of the variable gain amplifier.

[0021] Switch: Receives the signal output from the first intermediate frequency amplifier and the signal output from the variable gain amplifier, and selects the output accordingly;

[0022] Automatic amplitude and phase calibrator: calibrates and matches the amplitude and phase of the local carrier signal mixed in an active mixer;

[0023] Automatic frequency controller: performs frequency calibration on intermediate frequency filters and high linearity filters;

[0024] First frequency synthesizer: generates local carrier signals, which are output to the active mixer and the passive mixer respectively.

[0025] In the aforementioned CMOS monolithically integrated military navigation multi-mode multi-frequency multi-channel parallel RF receiver, the first frequency synthesizer includes a first voltage-controlled oscillator, a first loop filter, a first crystal oscillator, a first charge pump, a first phase detector, and a first frequency divider, wherein:

[0026] The voltage-controlled oscillator receives the DC signal output from the first loop filter, converts the DC signal into an AC signal, and outputs one of the AC signals to the frequency divider and the other as a local carrier signal to the active mixer and the passive mixer respectively.

[0027] The first frequency divider receives the AC signal output from the voltage-controlled oscillator, performs frequency division processing on the AC signal, and outputs the frequency-divided signal to the first phase detector.

[0028] The first phase detector receives signals from the first crystal oscillator and the first frequency divider, identifies the phase difference between the two signals, and generates an output signal whose phase is proportional to the phase difference, and outputs the output signal to the first charge pump.

[0029] The first charge pump receives a signal from the first phase detector, converts the voltage signal into a current signal, and outputs the current signal to the first loop filter;

[0030] The first loop filter receives the signal output by the first charge pump, filters out the high-order harmonic components in the signal, and outputs the filtered signal to the voltage-controlled oscillator.

[0031] The first crystal oscillator generates a reference frequency, which is output to the first phase detector.

[0032] In the aforementioned CMOS monolithically integrated military navigation multi-mode multi-frequency multi-channel parallel RF receiver, the second frequency synthesizer includes a second voltage-controlled oscillator, a second loop filter, a second crystal oscillator, a second charge pump, a second phase detector, and a second frequency divider, wherein:

[0033] Sampling clock voltage-controlled oscillator: Receives the signal output from the second loop filter, converts the sampling clock DC signal into a sampling clock AC signal, and outputs one of the sampling clock AC signals to the second frequency divider, and the other as a programmable sampling clock signal output;

[0034] The second frequency divider receives the signal output by the sampling clock voltage-controlled oscillator, performs frequency division processing on the signal frequency, and outputs the frequency-divided signal to the second phase detector.

[0035] The second phase detector receives signals from the second crystal oscillator and the second frequency divider, identifies the phase difference between the two signals, and generates an output signal with a phase proportional to the phase difference, and outputs the output signal to the second charge pump.

[0036] The second charge pump receives a signal from the second phase detector, converts the voltage signal into a current signal, and outputs the current signal to the second loop filter;

[0037] The second loop filter receives the signal output by the second charge pump, filters out the high-order harmonic components in the signal, and outputs the filtered signal to the sampling clock voltage-controlled oscillator.

[0038] The second crystal oscillator generates a reference frequency, which is output to the second phase detector.

[0039] In the aforementioned CMOS monolithically integrated military navigation multi-mode multi-frequency multi-channel parallel radio frequency receiver, the externally input navigation signal comes from GPS, GLONASS, Compass, or Galileo navigation systems.

[0040] The advantages of this invention compared to the prior art are:

[0041] (1) This invention integrates two completely independent radio frequency receiving channels, which can be configured independently and support any combination of various navigation frequency points for reception.

[0042] (2) This invention integrates two functional channels, a conventional channel and an anti-interference channel, within each channel. The two channels can be selected by enabling control. The conventional channel is characterized by high gain and high sensitivity, supports AGC function, and outputs digital intermediate frequency and analog intermediate frequency, mainly meeting the application needs of conventional navigation. The anti-interference channel is characterized by high linearity and low gain, and outputs analog intermediate frequency, mainly meeting the application needs of military anti-interference navigation. The combination of the two supports a wide range of military navigation application needs.

[0043] (3) By using a broadband local oscillator unit, this invention can receive all mainstream navigation frequencies of navigation systems such as GPS / GLONASS / Compass / Galileo, and has a wide range of applications.

[0044] (4) The present invention can flexibly switch between digital intermediate frequency output and analog intermediate frequency output by means of output switch selection, supporting various application needs of the system; by using current reuse technology, it ensures low power consumption of the chip under high integration.

[0045] (5) Each RF receiving channel of this invention can flexibly select to operate in a conventional channel mode or an anti-interference channel mode. When one channel is working, the other channel can be completely shut down, saving power consumption and reducing interference. Finally, the output form of each channel is selected by the output switch; the two RF receiving channels can support various navigation frequencies, various modes and various application requirements, meeting the application needs of the whole machine. Attached Figure Description

[0046] Figure 1 This is a structural block diagram of the military navigation multi-mode multi-frequency multi-channel parallel radio frequency receiver of the present invention;

[0047] Figure 2 The above is a simulation curve of the anti-interference channel OIP3 in an embodiment of the present invention;

[0048] Figure 3 The simulation curves show the noise figure (left) and gain (right) under the conventional channel conditions of this invention. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0050] like Figure 1 The diagram shows the structural block diagram of the military navigation multi-mode multi-frequency multi-channel parallel radio frequency receiving device of the present invention. As can be seen from the figure, the parallel radio frequency receiving device of the present invention includes a second frequency synthesizer and two complete and independent radio frequency receiving channels, which respectively receive two externally input navigation signals. The two radio frequency receiving channels have the same structure, both including a conventional channel and an anti-interference channel. The following description only refers to one radio frequency receiving channel.

[0051] Depend on Figure 1 It is known that the RF receiving channel includes a high linearity low noise amplifier, a passive mixer, a high linearity filter, a first intermediate frequency amplifier, a switch, a high gain low noise amplifier, an active mixer, an intermediate frequency filter, a second intermediate frequency amplifier, a variable gain amplifier, an analog-to-digital converter controller, an automatic gain controller, an automatic frequency controller, an automatic amplitude and phase calibrator, and a first frequency synthesizer.

[0052] The high-linearity low-noise amplifier, passive mixer, high-linearity filter, and first intermediate frequency amplifier form an anti-interference channel, which supports down-conversion of all navigation frequencies and is characterized by high linearity. The high-gain low-noise amplifier, active mixer, intermediate frequency filter, second intermediate frequency amplifier, variable gain amplifier, analog-to-digital converter controller, and automatic gain controller form a conventional channel, which performs down-conversion of all navigation frequencies and is characterized by high gain and high sensitivity.

[0053] The functions of each module in the RF receiving channel are as follows:

[0054] I. Anti-interference channel

[0055] The high linearity low noise amplifier receives the externally input navigation signal, processes it to improve the linearity and anti-interference capability of the signal, and outputs the processed signal to the passive mixer.

[0056] The passive mixer receives the signal output from the high linearity low noise amplifier and the local carrier signal generated by the first frequency synthesizer, performs frequency mixing on the two signals, converts them into a down-converted signal, and outputs the down-converted signal to the high linearity filter.

[0057] The high linearity filter receives the signal output from the passive mixer, performs high linearity filtering processing to filter out interference signals, and outputs the filtered intermediate frequency signal to the first intermediate frequency amplifier.

[0058] The first intermediate frequency amplifier receives the intermediate frequency signal output from the high linearity filter, amplifies it, and then outputs the amplified signal to the switch.

[0059] II. Conventional Channel

[0060] The high-gain low-noise amplifier receives the first navigation signal from the external input, processes it, and outputs the processed signal to the active filter.

[0061] The active mixer receives the signal output from the high-gain low-noise amplifier and the local carrier signal generated by the first frequency synthesizer, performs frequency mixing on the two signals, converts them into down-converted signals, and performs automatic amplitude and phase calibration, and outputs the calibrated signal to the intermediate frequency filter.

[0062] The intermediate frequency filter receives the signal output from the active mixer, performs intermediate frequency filtering on the signal, and then outputs it to the second intermediate frequency amplifier.

[0063] The second intermediate frequency amplifier receives the signal output from the intermediate frequency filter, amplifies it, and then outputs the signal to the variable gain amplifier.

[0064] The variable gain amplifier forwards the signal received from the second intermediate frequency amplifier to the analog-to-digital converter controller. At the same time, under the control of the automatic gain controller, it adjusts the signal gain of the signal received from the second intermediate frequency amplifier and outputs the gain-adjusted signal to the switch.

[0065] The analog-to-digital converter receives the signal sent by the variable gain amplifier, converts the analog signal into a digital signal, and outputs the converted digital signal to the automatic gain controller.

[0066] The self-controlled gain controller receives the digital signal output by the analog-to-digital converter and controls the gain of the variable gain amplifier according to the level of the digital signal.

[0067] III. First Frequency Synthesizer

[0068] like Figure 1 As shown, the first frequency synthesizer generates a local carrier signal, which is output to the active mixer and the passive mixer respectively.

[0069] The first frequency synthesizer is fully integrated on-chip. It consists of a first frequency divider, a first phase detector, a first crystal oscillator, a first charge pump, a voltage-controlled oscillator, and a first loop filter. It provides a local carrier signal to the circuit, which is then mixed with either the signal output from a high-linearity low-noise amplifier or the signal output from a high-gain low-noise amplifier.

[0070] The voltage-controlled oscillator receives the DC signal output from the first loop filter, converts the DC signal into an AC signal, and outputs one of the AC signals to the frequency divider and the other as a local carrier signal (local oscillator) to the active mixer and the passive mixer respectively.

[0071] The first frequency divider receives the AC signal output from the voltage-controlled oscillator, performs frequency division processing on the AC signal, and outputs the frequency-divided signal to the first phase detector.

[0072] The first phase detector receives signals from the first crystal oscillator and the first frequency divider, identifies the phase difference between the two signals, and generates an output signal whose phase is proportional to the phase difference, and outputs the output signal to the first charge pump.

[0073] The first charge pump receives a signal from the first phase detector, converts the voltage signal into a current signal, and outputs the current signal to the first loop filter;

[0074] The first loop filter receives the signal output by the first charge pump, filters out the high-order harmonic components in the signal, and outputs the filtered signal to the voltage-controlled oscillator.

[0075] The first crystal oscillator generates a reference frequency, which is output to the first phase detector.

[0076] IV. Other Modules

[0077] The switch receives the signal output from the first intermediate frequency amplifier and the signal output from the variable gain amplifier, and selects the output, that is, selects the output signal from the anti-interference channel and the conventional channel.

[0078] The automatic amplitude and phase calibrator calibrates and matches the amplitude and phase of the local carrier signal mixed in the active mixer.

[0079] The automatic frequency controller performs frequency calibration on the intermediate frequency filter and the high linearity filter.

[0080] In addition to the two independent radio frequency receiving channels described above, the multi-mode, multi-frequency, multi-channel parallel radio frequency receiving device of the present invention also includes a second frequency synthesizer.

[0081] The second frequency synthesizer is fully integrated on-chip. It consists of a second frequency divider, a second phase detector, a second crystal oscillator, a second charge pump, a sampling clock voltage-controlled oscillator, and a second loop filter, used to generate a programmable sampling clock signal, wherein:

[0082] Sampling clock voltage-controlled oscillator: Receives the signal output from the second loop filter, converts the sampling clock DC signal into a sampling clock AC signal, and outputs one of the sampling clock AC signals to the second frequency divider, and the other as a programmable sampling clock signal output;

[0083] The second frequency divider receives the signal output by the sampling clock voltage-controlled oscillator, performs frequency division processing on the signal frequency, and outputs the frequency-divided signal to the second phase detector.

[0084] The second phase detector receives signals from the second crystal oscillator and the second frequency divider, identifies the phase difference between the two signals, and generates an output signal with a phase proportional to the phase difference, and outputs the output signal to the second charge pump.

[0085] The second charge pump receives a signal from the second phase detector, converts the voltage signal into a current signal, and outputs the current signal to the second loop filter;

[0086] The second loop filter receives the signal output by the second charge pump, filters out the high-order harmonic components in the signal, and outputs the filtered signal to the sampling clock voltage-controlled oscillator.

[0087] The second crystal oscillator generates a reference frequency, which is output to the second phase detector.

[0088] Each RF receiving channel in this invention can flexibly select between a conventional channel mode and an anti-interference channel mode. When one channel is active, the other can be completely shut down, saving power and reducing interference. The output mode of each channel is ultimately selected by an output switch. The two RF receiving channels of this invention can support various navigation frequencies, modes, and application requirements, meeting the overall application needs of the device.

[0089] Each receiving channel has an independent broadband local oscillator unit that provides its own local oscillator signal. This local oscillator can cover 1.1GHz-1.7GHz, ensuring support for the reception of all mainstream navigation frequencies of navigation systems such as GPS / GLONASS / Compass / Galileo.

[0090] Figure 1 In the code, TCXO provides the clock signal, SCLK provides the serial clock input, SDAO provides the serial data output, SDAI provides the serial data input, and SS provides the serial enable signal.

[0091] like Figure 2 The figure shows the simulation curve of the anti-interference channel OIP3 in the embodiment of the present invention. As can be seen from the figure, the circuit has good linearity performance and improves the anti-interference capability of the system.

[0092] The chip based on this architecture has been fabricated and verified through system integration testing. The actual chip size is 3.4mm × 2.7mm, and the solution is feasible.

[0093] like Figure 3 The figure shows the simulation curves of noise figure (left) and gain (right) under conventional channel conditions of the present invention. The left figure is the noise figure simulation curve and the right figure is the gain simulation curve. As can be seen from the figure, the circuit has a small noise figure and ideal gain, indicating that the system has achieved good performance.

[0094] The conventional channel gain in the RF receiving channel of this invention reaches a maximum of 110dB, with a channel noise figure of 4dB and an automatic gain control range of 45dB. It can output analog and digital intermediate frequency (IF) signals, meeting the needs of conventional navigation applications. The anti-jamming channel gain is 20dB, with an input 1dB compression point of -8dBm and an OIP3 of 25dBm, primarily meeting the linearity requirements of military anti-jamming navigation.

[0095] The above description is only the best specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the protection scope of the present invention.

[0096] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A CMOS monolithically integrated military navigation multi-mode multi-frequency multi-channel parallel radio frequency receiver, characterized in that: It includes two independent RF receiving channels and a second frequency synthesizer. The second frequency synthesizer is used to generate a programmable sampling clock signal. Each independent RF receiving channel includes a high-linearity low-noise amplifier, a passive mixer, a high-linearity filter, a first intermediate frequency amplifier, a switch, a high-gain low-noise amplifier, an active mixer, an intermediate frequency filter, a second intermediate frequency amplifier, a variable gain amplifier, an analog-to-digital converter controller, an automatic gain controller, an automatic frequency controller, an automatic amplitude and phase calibrator, and the first frequency synthesizer. The high-linearity low-noise amplifier, passive mixer, high-linearity filter, and first intermediate frequency amplifier form the anti-interference channel; the high-gain low-noise amplifier, active mixer, intermediate frequency filter, second intermediate frequency amplifier, variable gain amplifier, analog-to-digital converter controller, and automatic gain controller form the conventional channel. The functions of each module are as follows: High linearity low noise amplifier: Receives external navigation signals, processes them through the high linearity low noise amplifier, and outputs the processed signal to the passive mixer; Passive mixer: Receives the signal output from a high linearity low noise amplifier and the local carrier signal generated by a first frequency synthesizer, performs frequency mixing on the two signals, converts them into a down-converted signal, and outputs the down-converted signal to a high linearity filter; High linearity filter: Receives the signal output from the passive mixer, performs high linearity filtering to filter out interference signals, and outputs the filtered intermediate frequency signal to the first intermediate frequency amplifier; First intermediate frequency amplifier: Receives the intermediate frequency signal output from the high linearity filter, amplifies it, and then outputs the amplified signal to the switch; High-gain low-noise amplifier: The navigation signal received from the outside is processed by the high-gain low-noise amplifier, and the processed signal is output to the active mixer. Active mixer: Receives the signal output from the high-gain low-noise amplifier and the local carrier signal generated by the first frequency synthesizer, mixes the two signals to convert them into a down-converted signal, performs automatic amplitude and phase calibration, and outputs the calibrated signal to the intermediate frequency filter; Intermediate frequency filter: Receives the signal output from the active mixer, performs intermediate frequency filtering on the signal, and outputs it to the second intermediate frequency amplifier; Second intermediate frequency amplifier: After receiving the signal output from the intermediate frequency filter and performing gain amplification processing, the signal is output to the variable gain amplifier; Variable gain amplifier: forwards the signal received from the second intermediate frequency amplifier to the analog-to-digital converter controller, and at the same time adjusts the signal gain of the signal received from the second intermediate frequency amplifier under the control of the automatic gain controller, and outputs the gain-adjusted signal to the switch; Analog-to-digital converter controller: Receives signals from the variable gain amplifier, converts analog signals into digital signals, and outputs the converted digital signals to the automatic gain controller; Automatic gain controller: Receives the digital signal output from the analog-to-digital converter controller and controls the gain of the variable gain amplifier according to the level of the digital signal; Switch: Receives the signal output from the first intermediate frequency amplifier and the signal output from the variable gain amplifier, and selects the output accordingly; Automatic amplitude and phase calibrator: calibrates and matches the amplitude and phase of the local carrier signal mixed in an active mixer; Automatic frequency controller: performs frequency calibration on intermediate frequency filters and high linearity filters; First frequency synthesizer: generates local carrier signals, which are output to the active mixer and the passive mixer respectively.

2. The CMOS monolithically integrated military navigation multi-mode multi-frequency multi-channel parallel radio frequency receiver according to claim 1, characterized in that: The first frequency synthesizer includes a voltage-controlled oscillator, a first loop filter, a first crystal oscillator, a first charge pump, a first phase detector, and a first frequency divider, wherein: The voltage-controlled oscillator receives the DC signal output from the first loop filter, converts the DC signal into an AC signal, and outputs one of the AC signals to the first frequency divider, and the other is output as a local carrier signal to the active mixer and the passive mixer respectively. The first frequency divider receives the AC signal output from the voltage-controlled oscillator, performs frequency division processing on the AC signal, and outputs the frequency-divided signal to the first phase detector. The first phase detector receives signals from the first crystal oscillator and the first frequency divider, identifies the phase difference between the two signals, and generates an output signal whose phase is proportional to the phase difference, and outputs the output signal to the first charge pump. The first charge pump receives a signal from the first phase detector, converts the voltage signal into a current signal, and outputs the current signal to the first loop filter; The first loop filter receives the signal output by the first charge pump, filters out the high-order harmonic components in the signal, and outputs the filtered signal to the voltage-controlled oscillator. The first crystal oscillator generates a reference frequency, which is output to the first phase detector.

3. The CMOS monolithically integrated military navigation multi-mode multi-frequency multi-channel parallel radio frequency receiver according to claim 1, characterized in that: The second frequency synthesizer includes a sampling clock voltage-controlled oscillator, a second loop filter, a second crystal oscillator, a second charge pump, a second phase detector, and a second frequency divider, wherein: Sampling clock voltage-controlled oscillator: Receives the signal output from the second loop filter, converts the sampling clock DC signal into a sampling clock AC signal, and outputs one of the sampling clock AC signals to the second frequency divider, and the other as a programmable sampling clock signal output; The second frequency divider receives the signal output by the sampling clock voltage-controlled oscillator, performs frequency division processing on the signal frequency, and outputs the frequency-divided signal to the second phase detector. The second phase detector receives signals from the second crystal oscillator and the second frequency divider, identifies the phase difference between the two signals, and generates an output signal with a phase proportional to the phase difference, and outputs the output signal to the second charge pump. The second charge pump receives a signal from the second phase detector, converts the voltage signal into a current signal, and outputs the current signal to the second loop filter; The second loop filter receives the signal output by the second charge pump, filters out the high-order harmonic components in the signal, and outputs the filtered signal to the sampling clock voltage-controlled oscillator. The second crystal oscillator generates a reference frequency, which is output to the second phase detector.

4. The CMOS monolithically integrated military navigation multi-mode multi-frequency multi-channel parallel radio frequency receiver according to claim 1, characterized in that: The externally input navigation signals come from GPS, GLONASS, Compass, or Galileo navigation systems.

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