CN110380725B - Gain control system and method of frequency and phase discrimination module - Google Patents
Gain control system and method of frequency and phase discrimination module Download PDFInfo
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- CN110380725B CN110380725B CN201910463491.6A CN201910463491A CN110380725B CN 110380725 B CN110380725 B CN 110380725B CN 201910463491 A CN201910463491 A CN 201910463491A CN 110380725 B CN110380725 B CN 110380725B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a gain control system and a method of a frequency and phase discrimination module, wherein the system comprises: the device comprises a frequency discrimination phase discrimination module, a variable resistance module, a low-pass filter module and a bandwidth correction module which are sequentially connected, wherein the bandwidth correction module is respectively connected with the low-pass filter module and the variable resistance module. The system and the method provided by the invention can eliminate the problem that the gain of the frequency and phase discrimination module depends on the power supply voltage, and simultaneously provide a stable reference frequency source. The system and the method provided by the invention can eliminate the problem that the gain of the frequency and phase discrimination module depends on the power supply voltage, and simultaneously provide a stable reference frequency source, and have the advantages of simple structure, low power consumption and strong performance.
Description
Technical Field
The invention relates to the field of frequency synthesis, in particular to a gain control system and method of a frequency and phase discrimination module.
Background
The phase-locked loop is used as a feedback circuit, compares the phase errors of the reference clock signal and the output signal after passing through the frequency divider, adjusts and controls the output frequency of the local oscillator, so that the output frequency of the phase-locked loop and the reference frequency meet a certain multiple relation, and is widely applied to a digital synchronous system and a narrow-band phase tracking receiver. With the progress of integrated circuit manufacturing processes and the development of electronic communication systems, reducing power supply voltage has become a primary method of reducing power consumption of circuit systems in order to improve power utilization efficiency. However, in the low supply voltage application scenario, conventional charge pump-based frequency synthesis systems suffer from a series of problems, such as: the dead zone problem is more serious due to the long side of the charge pump on time; the charge pump up and down currents are difficult to match, output signal reference spurious is more serious, and the like. Therefore, it is difficult to realize a circuit system meeting performance requirements by using a frequency synthesis technology based on a charge pump in a low power consumption method by means of reducing a power supply voltage.
For a conventional charge pump-free phase-locked loop system, although the problem is not solved, the phase-locked loop system has good compatibility with a power supply voltage, and the gain of the frequency and phase discrimination module depends on the power supply voltage. On one hand, the power supply noise is directly reflected on the phase noise of the output degradation system of the frequency and phase discrimination module, on the other hand, the charge and discharge current of the subsequent filter by the frequency and phase discrimination module is changed along with the change of the control voltage of the local oscillator, the linearity of the system is deteriorated, and the phase noise of the system is further deteriorated.
Although, the charge pump-free phase-locked loop system based on the operational amplifier solves the problem that the charge and discharge current of the low-pass filter is not constant by the frequency and phase discrimination module through the voltage at two ends of the series resistor of the frequency and phase discrimination module when the clamp is conducted, and realizes the frequency and phase discrimination module with constant gain. However, the use of the operational amplifier significantly increases the power consumption of the system, the structure becomes more complicated, and furthermore, it is very difficult to realize a low power supply voltage operational amplifier that satisfies the index.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a gain control system and a method of a frequency and phase discrimination module, which can eliminate the problem that the gain of the frequency and phase discrimination module depends on the power supply voltage and provide a stable reference frequency source.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a gain control system for a frequency and phase discrimination module, comprising: the device comprises a frequency discrimination phase discrimination module, a variable resistance module, a low-pass filter module and a bandwidth correction module which are sequentially connected, wherein the bandwidth correction module is respectively connected with the low-pass filter module and the variable resistance module;
the frequency and phase discrimination module is used for acquiring the frequency difference and the phase difference between the feedback signal after frequency division of the local oscillator and the externally input reference clock signal;
the low-pass filtering module is used for performing high-frequency inhibition processing on an output signal of the frequency and phase discrimination module according to the frequency difference and the phase difference, and performing frequency adjustment on the local oscillator by the output signal;
the bandwidth correction module is used for sampling an output signal of the low-pass filtering module, controlling a resistance value of the variable resistance module by the output signal, adjusting the charge and discharge current of the low-pass filtering module by the frequency discrimination phase discrimination module, and adjusting the gain of the frequency discrimination phase discrimination module.
Further, the gain control system of the frequency and phase discrimination module comprises a frequency synthesizer module with controllable frequency and an output circuit module, wherein the output circuit module is used for generating an output signal with a specific form according to the frequency difference and the phase difference; and the output signal of the frequency discrimination phase discrimination module has monotonicity with the frequency difference and the phase difference.
Further, the gain control system of the frequency and phase discrimination module as described above, wherein the frequency and phase discrimination module implements monotonicity between the output signal and the phase difference by at least one of the following modes:
generating a high level output signal when the phase of the reference clock signal leads the feedback signal, and generating a low level output signal when the phase of the reference clock signal lags the feedback signal;
generating a low level output signal when the phase of the reference clock signal leads the feedback signal, and generating a high level output signal when the phase of the reference clock signal lags the feedback signal;
generating an output signal of a positive voltage or a positive current when a phase of the reference clock signal leads the feedback signal, the larger the phase difference is, the larger the magnitude of the positive voltage or the positive current is, and generating an output signal of a negative voltage or a negative current when the phase of the reference clock signal lags the feedback signal, the larger the phase difference is, the larger the magnitude of the negative voltage or the negative current is;
the output signal of negative voltage or negative current is generated when the phase of the reference clock signal leads the feedback signal, the larger the phase difference is, the larger the amplitude of negative voltage or negative current is, the output signal of positive voltage or positive current is generated when the phase of the reference clock signal lags the feedback signal, and the larger the phase difference is, the larger the amplitude of positive voltage or positive current is.
Further, in the gain control system of the frequency and phase discrimination module, the output signal of the bandwidth calibration module is an analog signal or a digital control word.
Further, in the gain control system of the frequency discrimination phase discrimination module, the variable resistance module is composed of a device for controlling the resistance value of the small signal resistor by an analog signal or a resistor array for controlling the resistance value by a digital control word, and the analog signal, the digital control word and the resistance value of the variable resistance module have monotonicity.
Further, in the gain control system of the frequency and phase discrimination module, the output signal of the variable resistance module is a current signal.
Further, in the gain control system of the frequency and phase discrimination module, the bandwidth of the low-pass filtering module is higher than the loop bandwidth of the frequency synthesizer module.
Further, in the gain control system of the frequency and phase discrimination module, the low-pass filtering module is composed of a resistor and a capacitor.
Further, in the gain control system of the frequency and phase discrimination module, the output signal of the low-pass filtering module is a voltage signal.
The embodiment of the invention also provides a gain control method of the frequency and phase discrimination module, which comprises the following steps:
s1, a frequency and phase discrimination module acquires the frequency difference and the phase difference between a feedback signal after frequency division of a local oscillator and an externally input reference clock signal;
s2, the low-pass filtering module carries out high-frequency inhibition processing on an output signal of the frequency and phase discrimination module according to the frequency difference and the phase difference, and the output signal carries out frequency adjustment on the local oscillator;
s3, the bandwidth correction module samples output signals of the low-pass filtering module, the output signals control resistance values of the variable resistance module, the magnitude of charge and discharge currents of the low-pass filtering module by the frequency and phase discrimination module is adjusted, and the gain of the frequency and phase discrimination module is adjusted.
The invention has the beneficial effects that: the system and the method provided by the invention acquire the frequency difference and the phase difference of the oscillator output signal and the reference clock signal with controllable frequency after frequency division through the frequency discrimination phase discrimination module, limit the frequency band width through the low-pass filtering module, generate corresponding control signal change according to the frequency difference and the phase difference of the two signals so as to carry out frequency adjustment and tracking, achieve the purpose of maintaining the constant bandwidth of the phase-locked loop on the basis of realizing frequency multiplication of the input reference signal, can eliminate the problem that the gain of the frequency discrimination phase discrimination module depends on the power supply voltage, and simultaneously provide a stable reference frequency source.
Drawings
Fig. 1 is a schematic structural diagram of a conventional charge pump-based frequency synthesis system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a conventional charge pump-free frequency synthesis system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a gain control system of a frequency and phase discrimination module according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a phase-locked loop system of a gain control system based on a frequency and phase discrimination module according to a second embodiment of the present invention;
fig. 5 is a flow chart of a gain control method of a frequency and phase discrimination module provided in the third embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
First, before introducing a gain control system of a phase frequency discrimination module according to an embodiment of the present invention, a scheme for implementing a phase-locked loop system is first described. Fig. 1 is a schematic diagram of a conventional charge pump-based frequency synthesis system. As shown in fig. 1, the frequency and phase discrimination module acquires a frequency error and a phase error between a reference clock signal and a local oscillation signal after passing through the frequency division module, the signal type is in a voltage form, the signal type is converted into a current or charge form through the processing of a charge pump, and then the local oscillator is controlled through the processing signal of the low-pass filtering module, so that the frequency error or the phase error is positive, and the oscillation frequency of the local oscillator is increased; conversely, the oscillation frequency of the local oscillator decreases.
However, because the up and down currents of the charge pump are not matched, there will be a static phase error in the system, deteriorating the system index. At low supply voltages, the above phenomenon becomes more pronounced. In addition, because parasitic capacitance exists in the input of the charge pump, a certain time is needed for turning on the charge pump, so that dead zone effect exists when the system distinguishes small phase errors, and the phase noise of the system is improved.
Fig. 2 is a schematic diagram of a conventional frequency synthesis system without a charge pump. As shown in fig. 2, the frequency and phase discrimination module acquires a frequency error and a phase error between the reference clock signal and the local oscillation signal after passing through the frequency division module, and the processing signal passing through the low-pass filtering module controls the local oscillator so that the frequency error or the phase error is positive, and the oscillation frequency of the local oscillator is increased; conversely, the oscillation frequency of the local oscillator decreases. The main difference between fig. 2 and fig. 1 is that the output signal of the phase frequency discrimination module is not processed by the charge pump to perform signal type conversion, and the gain is not controllable. The control voltage of the local oscillator is different for different output frequencies. The input voltage of the low-pass filter is the power supply voltage or the ground, so that the type of the local oscillator is given, and for different locking frequencies, the charge and discharge currents of the low-pass filter module by the frequency and phase discrimination module of the phase-locked loop are different, namely the gain of the frequency and phase discrimination module is not constant, and the phase-locked loop system is difficult to meet the system index.
The invention provides a gain control system of a frequency and phase discrimination module based on the above problems, which is specifically as follows.
Example 1
As shown in fig. 3, a gain control system of a frequency and phase discrimination module includes: the device comprises a frequency discrimination phase discrimination module 100, a variable resistance module 200, a low-pass filter module 300 and a bandwidth correction module 400 which are sequentially connected, wherein the bandwidth correction module 400 is respectively connected with the low-pass filter module 300 and the variable resistance module 200;
the frequency and phase discrimination module 100 is used for acquiring the frequency difference and the phase difference between the feedback signal after frequency division of the local oscillator and the externally input reference clock signal;
the low-pass filtering module 300 is configured to perform high-frequency suppression processing on an output signal of the frequency and phase discrimination module according to the frequency difference and the phase difference, and the output signal performs frequency adjustment on the local oscillator;
the high-frequency component in the output signal of the frequency and phase discrimination module 100 is suppressed by the low-pass filtering module 300, and a low-frequency direct-current component reflecting the phase error is obtained to control the oscillation frequency of the local oscillator.
The bandwidth correction module 400 is configured to sample an output signal of the low-pass filter module 300, control a resistance value of the variable resistance module 200, adjust a charge-discharge current of the low-pass filter module 300 by the frequency and phase discrimination module 100, and adjust a gain of the frequency and phase discrimination module 100.
The input of the bandwidth correction module 400 is the output voltage (output signal) of the sampling low-pass filter 300, and the resistance value of the variable resistance module 200 cascaded with the frequency and phase discrimination module 100 is output to regulate and control the charge and discharge current of the frequency and phase discrimination module 100 to the low-pass filter 300, so that the effect of regulating the gain of the frequency and phase discrimination module 100 is achieved, and the effect that the bandwidth of the phase-locked loop does not change along with the average output change of the loop filter is achieved.
In this embodiment, the frequency and phase discrimination module 100 includes a frequency synthesizer module with controllable frequency and an output circuit module, where the output circuit module is configured to generate an output signal in a specific form according to the frequency difference and the phase difference; the output signal of the frequency discrimination phase discrimination module has monotonicity with the frequency difference and the phase difference. May be a particular linear or nonlinear relationship. When the absolute value of the phase difference or the frequency difference is large, the absolute value of the amplitude of the generated output signal needs to be not lower than that when the absolute value of the phase difference or the frequency difference is small.
The frequency and phase discrimination module 100 implements monotonicity between the output signal and the phase difference in at least one of the following ways:
generating a high-level output signal when the phase of the reference clock signal leads the feedback signal, and generating a low-level output signal when the phase of the reference clock signal lags the feedback signal;
generating a low-level output signal when the phase of the reference clock signal leads the feedback signal, and generating a high-level output signal when the phase of the reference clock signal lags the feedback signal;
when the phase of the reference clock signal leads the feedback signal, an output signal of positive voltage or positive current is generated, the larger the phase difference is, the larger the amplitude of the positive voltage or positive current is, and when the phase of the reference clock signal lags the feedback signal, an output signal of negative voltage or negative current is generated, the larger the phase difference is, and the larger the amplitude of the negative voltage or negative current is;
the phase of the reference clock signal leads the feedback signal to generate an output signal of negative voltage or negative current, the larger the phase difference is, the larger the amplitude of the negative voltage or negative current is, and the phase of the reference clock signal lags the feedback signal to generate an output signal of positive voltage or positive current, the larger the phase difference is, and the larger the amplitude of the positive voltage or positive current is.
In this embodiment, the output signal of the bandwidth calibration module 400 is an analog signal or a digital control word.
The variable resistance module 200 is composed of a device for controlling the resistance value of a small signal resistor by an analog signal or a resistor array for controlling the resistance value of a resistor by a digital control word, and the analog signal, the digital control word and the resistance value of the variable resistance module 200 have monotonicity. The relationship may be linear or nonlinear, i.e., the resistance value increases or decreases gradually as the control signal increases gradually.
The output signal of the variable resistance module 200 is a current signal.
In this embodiment, the bandwidth of the low-pass filter module 300 is higher than the loop bandwidth of the frequency synthesizer module. The low pass filter module 300 is composed of a resistor and a capacitor. The output signal of the low pass filter module 300 is a voltage signal.
According to the gain control system of the frequency and phase discrimination module, the frequency difference and the phase difference of the feedback signal and the input reference clock signal after frequency division of the local oscillator are obtained through the frequency and phase discrimination module 100, the gain of the frequency and phase discrimination module is changed through the variable resistor module 200, and the frequency band is limited according to the frequency difference and the phase difference of the signals, so that a control signal for frequency adjustment of the local oscillator is output. The bandwidth correction module 400 samples the output voltage of the low-pass filter 300, and outputs and controls the resistance value of the variable resistance module 200 cascaded with the frequency and phase discrimination module 100, so that the charge and discharge current of the frequency and phase discrimination module 100 to the low-pass filter 300 is regulated and controlled, and the effect of regulating the gain of the frequency and phase discrimination module 100 is achieved.
Example two
Fig. 4 is a schematic diagram of a phase-locked loop system of a gain control system based on a frequency and phase discrimination module. As shown in fig. 4, the frequency and phase discrimination module 100 obtains the frequency difference and the phase difference between the feedback signal of the local oscillator module after being divided by the frequency divider module and the reference clock signal input by the reference clock module, and changes the gain of the frequency and phase discrimination module 100 through the variable resistor module 200; the low-pass filtering module 300 performs high-frequency inhibition processing on the output signal of the frequency and phase discrimination module 100 according to the frequency difference and the phase difference, and the output signal performs frequency adjustment on the local oscillator; the bandwidth correction module 400 samples an output signal of the low-pass filter module 300, and the output signal controls the resistance value of the variable resistance module 200 to adjust the charge and discharge current of the low-pass filter module 300 by the frequency discrimination phase discrimination module 100.
The system can eliminate the problem that the bandwidth of the conventional charge pump-free phase-locked loop changes along with the average output change of the loop filter, and has the advantage of reducing phase noise caused by power supply noise. The frequency difference and the phase difference of the oscillator output signal and the reference clock signal with controllable frequency after frequency division are obtained through the frequency discrimination and phase discrimination module, the frequency band width is limited through the low-pass filtering module, corresponding control signal changes are generated according to the frequency difference and the phase difference of the two signals, so that frequency adjustment and tracking are carried out, the purpose of keeping the phase-locked loop bandwidth constant on the basis of realizing frequency multiplication of the input reference signal is achieved, and the frequency discrimination and phase discrimination device is simple in structure, low in power consumption and high in performance.
Example III
As shown in fig. 5, the embodiment of the present invention further provides a gain control method of a frequency and phase discrimination module, which includes:
s1, a frequency and phase discrimination module acquires the frequency difference and the phase difference between a feedback signal after frequency division of a local oscillator and an externally input reference clock signal;
s2, the low-pass filtering module carries out high-frequency inhibition processing on an output signal of the frequency and phase discrimination module according to the frequency difference and the phase difference, and the output signal carries out frequency adjustment on the local oscillator;
s3, the bandwidth correction module samples an output signal of the low-pass filtering module, the output signal controls the resistance value of the variable resistance module, the charge and discharge current of the low-pass filtering module by the frequency discrimination phase discrimination module is adjusted, and the gain of the frequency discrimination phase discrimination module is adjusted.
It should be noted that the foregoing explanation of the embodiment of the gain control system of the phase frequency discrimination module is also applicable to the control method of this embodiment, and will not be repeated here.
According to the gain control method of the frequency and phase discrimination module, the frequency difference and the phase difference between the reference clock signal and the feedback signal are obtained and amplified, and corresponding frequency changes are generated according to the frequency difference and the phase difference so as to carry out frequency adjustment. The bandwidth correction module adjusts the gain of the frequency discrimination phase discrimination module in real time so as to maintain the constant gain of the frequency discrimination phase discrimination module, further eliminate the characteristic that the system bandwidth of the phase-locked loop changes along with the change of the locking frequency, and has the advantages of simple structure, low power consumption and strong performance.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A gain control system for a frequency and phase discrimination module, comprising: the device comprises a frequency discrimination phase discrimination module, a variable resistance module, a low-pass filter module and a bandwidth correction module which are sequentially connected, wherein the bandwidth correction module is respectively connected with the low-pass filter module and the variable resistance module;
the frequency and phase discrimination module is used for acquiring the frequency difference and the phase difference between the feedback signal after frequency division of the local oscillator and the externally input reference clock signal;
the low-pass filtering module is used for performing high-frequency inhibition processing on the output signal of the frequency and phase discrimination module according to the frequency difference and the phase difference, and outputting a signal for performing frequency adjustment on the local oscillator;
the bandwidth correction module is used for sampling the output signal of the low-pass filter module, outputting a signal for controlling the resistance value of the variable resistance module, adjusting the charge and discharge current of the low-pass filter module by the frequency discrimination phase discrimination module, and adjusting the gain of the frequency discrimination phase discrimination module.
2. The gain control system of a frequency and phase discrimination module of claim 1, wherein the frequency and phase discrimination module includes a frequency synthesizer module with controllable frequency and an output circuit module for generating an output signal of a specific form according to the frequency difference and the phase difference; and the output signal of the frequency discrimination phase discrimination module has monotonicity with the frequency difference and the phase difference.
3. The gain control system of claim 2, wherein the phase and frequency discrimination module is configured to implement monotonicity between the output signal and the phase difference by at least one of:
generating a high level output signal when the phase of the reference clock signal leads the feedback signal, and generating a low level output signal when the phase of the reference clock signal lags the feedback signal;
generating a low level output signal when the phase of the reference clock signal leads the feedback signal, and generating a high level output signal when the phase of the reference clock signal lags the feedback signal;
generating an output signal of positive voltage or positive current when the phase of the reference clock signal leads the feedback signal, the larger the phase difference, the larger the amplitude of the positive voltage or positive current, and generating an output signal of negative voltage or negative current when the phase of the reference clock signal lags the feedback signal, the larger the phase difference, the larger the amplitude of the negative voltage or negative current;
the output signal of negative voltage or negative current is generated when the phase of the reference clock signal leads the feedback signal, the larger the phase difference is, the larger the amplitude of negative voltage or negative current is, the output signal of positive voltage or positive current is generated when the phase of the reference clock signal lags the feedback signal, and the larger the phase difference is, the larger the amplitude of positive voltage or positive current is.
4. The gain control system of a frequency and phase discrimination module according to claim 1, wherein the output signal of the bandwidth correction module is an analog signal or a digital control word.
5. The gain control system of a phase frequency and phase demodulation module according to claim 4, wherein the variable resistance module is composed of a device for controlling the resistance value of a small signal resistor by an analog signal or a resistor array for controlling the resistance value of a resistor by a digital control word, and the analog signal and the digital control word have monotonicity with the resistance value of the variable resistance module.
6. The gain control system of a phase frequency detector module of claim 5, wherein the output signal of the variable resistance module is a current signal.
7. The gain control system of claim 1, wherein the bandwidth of the low pass filter module is higher than the loop bandwidth of the frequency synthesizer module.
8. The gain control system of a phase frequency detector module of claim 1, wherein the low pass filter module is comprised of a resistor and a capacitor.
9. The gain control system of a phase frequency detector module of claim 1, wherein the output signal of the low pass filter module is a voltage signal.
10. A method for controlling the gain of a frequency and phase discrimination module of a gain control system based on the frequency and phase discrimination module of any one of claims 1-9, comprising:
s1, a frequency and phase discrimination module acquires the frequency difference and the phase difference between a feedback signal after frequency division of a local oscillator and an externally input reference clock signal;
s2, the low-pass filtering module carries out high-frequency inhibition processing on an output signal of the frequency and phase discrimination module according to the frequency difference and the phase difference, and the output signal carries out frequency adjustment on the local oscillator;
s3, the bandwidth correction module samples output signals of the low-pass filtering module, the output signals control resistance values of the variable resistance module, the magnitude of charge and discharge currents of the low-pass filtering module by the frequency and phase discrimination module is adjusted, and the gain of the frequency and phase discrimination module is adjusted.
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