CN111082751B - Frequency compensation system for crystal oscillator with amplitude phase compensation - Google Patents
Frequency compensation system for crystal oscillator with amplitude phase compensation Download PDFInfo
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- CN111082751B CN111082751B CN201911302544.2A CN201911302544A CN111082751B CN 111082751 B CN111082751 B CN 111082751B CN 201911302544 A CN201911302544 A CN 201911302544A CN 111082751 B CN111082751 B CN 111082751B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
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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 application is applicable to the technical field of crystal oscillators, and provides a frequency compensation system of a crystal oscillator with amplitude phase compensation, which comprises the following components: an acceleration sensor, an acceleration compensation circuit and a phase amplitude compensation circuit; the acceleration of the crystal oscillator is detected through the acceleration sensor, then the acceleration compensation circuit is used for carrying out acceleration compensation on the acceleration voltage signal to obtain acceleration compensation voltage, and finally the phase amplitude compensation circuit is used for carrying out amplitude and phase compensation on the acceleration compensation voltage to obtain final compensation voltage, so that the final compensation voltage can reduce the amplitude and phase deviation of the voltage signal of the acceleration sensor when the vibration intensity of the crystal oscillator is monitored, thereby reducing the frequency variation of the crystal oscillator, expanding the frequency compensation range of the crystal oscillator, and further optimizing the near-end dynamic phase noise of the crystal oscillator.
Description
Technical Field
The application belongs to the technical field of crystal oscillators, and particularly relates to a frequency compensation system of a crystal oscillator with amplitude phase compensation.
Background
The crystal oscillator has the characteristics of high frequency stability and low phase noise, and is generally used as a reference signal source of a system and widely applied to space military electronic systems such as vehicles, on-board and missile-borne systems. A crystal oscillator is a very vibration sensitive device whose electrical performance index, in particular phase noise, is severely degraded under vibration conditions. The greater the vibration intensity, the greater the dynamic phase noise degradation.
The conventional solution is to adopt a mechanical vibration reduction mode to reduce vibration intensity of the crystal oscillator by reducing vibration of the crystal oscillator through a vibration absorber, so that the deterioration amount of dynamic phase noise of the crystal oscillator is reduced. The vibration absorber has the defects that the vibration absorber has damping effect on vibration at the position which is larger than the resonance frequency due to the resonance frequency problem of the vibration absorber in a mechanical vibration reduction mode, has no damping effect on vibration at the position which is smaller than or equal to the resonance frequency, and even generates resonance at the resonance frequency to amplify the vibration intensity.
Disclosure of Invention
In view of the above, the embodiment of the application provides a frequency compensation system of a crystal oscillator with amplitude phase compensation, so as to solve the problem that the mechanical damping mode in the prior art cannot optimize the near-end dynamic phase noise of a low-frequency band.
The embodiment of the application provides a frequency compensation system of a crystal oscillator with amplitude phase compensation, which comprises the following components: an acceleration sensor, an acceleration compensation circuit and a phase amplitude compensation circuit;
the output end of the acceleration sensor is connected with the input end of the acceleration compensation circuit, the output end of the acceleration compensation circuit is connected with the input end of the phase amplitude compensation circuit, and the output end of the phase amplitude compensation circuit is connected with the crystal oscillator;
the acceleration sensor is used for detecting the acceleration of the crystal oscillator to obtain an acceleration voltage signal, and sending the acceleration voltage signal to the acceleration compensation circuit;
the acceleration compensation circuit is used for generating an acceleration compensation voltage according to the acceleration voltage signal and sending the acceleration compensation voltage to the phase amplitude compensation circuit;
the phase amplitude compensation circuit is used for carrying out amplitude compensation and phase compensation on the acceleration compensation voltage to obtain final compensation voltage, and sending the final compensation voltage to the crystal oscillator so that the crystal oscillator generates compensation frequency for reducing frequency offset according to the final compensation voltage.
In one embodiment, the acceleration compensation circuit includes an initial compensation module, a direction compensation module, and a phase noise detection module;
the initial compensation module is used for obtaining initial compensation voltage according to the acceleration voltage signal; and sending the initial compensation voltage to the direction compensation module;
the phase noise detection module is used for detecting the phase noise of the crystal oscillator after the frequency compensation in the previous period, obtaining a level control signal according to the phase noise, and feeding back the level control signal to the direction compensation module;
the direction compensation module is used for generating acceleration compensation voltage according to the initial compensation voltage and the level control signal.
In one embodiment, the acceleration compensation voltage includes a first compensation voltage and a second compensation voltage; the direction compensation module comprises a conversion type relay, a normal phase output unit and an opposite phase output unit;
the movable contact of the conversion type relay is connected with the output end of the initial compensation module, the first fixed contact of the conversion type relay is connected with the input end of the normal phase output unit, the second fixed contact of the conversion type relay is connected with the input end of the reverse phase output unit, and the output end of the normal phase output unit and the output end of the reverse phase output unit are respectively connected with the input end of the phase amplitude compensation circuit; the movable contact and the first fixed contact form a normally closed switch, and the movable contact and the second fixed contact form a normally open switch;
the conversion relay is used for converting the switch states of the normally open switch and the normally closed switch according to the level control signal fed back by the phase noise detection module;
the normal phase output unit obtains the first compensation voltage according to the initial compensation voltage;
the inverting output unit obtains the second compensation voltage according to the initial compensation voltage.
In one embodiment, the level control signal includes a high level signal and a low level signal, and the phase noise detection module includes a phase noise detector and a control unit;
the phase noise detector is used for detecting first phase noise of the crystal oscillator which is not subjected to frequency compensation and second phase noise of the crystal oscillator which is subjected to frequency compensation in the previous period, and sending the first phase noise and the second phase noise to the control unit;
the control unit is used for carrying out difference on the first phase noise and the second phase noise to obtain a noise difference value, outputting the high-level signal if the noise difference value is smaller than a noise difference threshold value, and outputting the low-level signal if the noise difference value is larger than or equal to the noise difference threshold value.
In one embodiment, the acceleration sensor is a three-axis acceleration sensor.
In one embodiment, the acceleration voltage signal includes an X-axis voltage component, a Y-axis voltage component, and a Z-axis voltage component; the initial compensation module comprises a first amplification unit, a second amplification unit, a third amplification unit and an addition unit;
the input end of the first amplifying unit is connected with the X-axis output end of the triaxial acceleration sensor, the output end of the first amplifying unit is connected with the input end of the adding unit, and the first amplifying unit is used for amplifying the X-axis voltage component;
the input end of the second amplifying unit is connected with the Y-axis output end of the triaxial acceleration sensor, the output end of the second amplifying unit is connected with the input end of the adding unit, and the second amplifying unit is used for amplifying the Y-axis voltage component;
the input end of the third amplifying unit is connected with the Z-axis output end of the triaxial acceleration sensor, the output end of the third amplifying unit is connected with the input end of the adding unit, and the third amplifying unit is used for amplifying the Z-axis voltage component;
the adding unit is used for summing the amplified X-axis voltage component, the amplified Y-axis voltage component and the amplified Z-axis voltage component to obtain an initial compensation voltage.
In one embodiment, the normal phase output unit includes a first output resistor.
In one embodiment, the inverting output unit includes an inverter.
In one embodiment, the phase amplitude compensation circuit comprises a first compensation resistor, a second compensation resistor, a first compensation capacitor, a second compensation capacitor, and a first operational amplifier;
the non-inverting input end of the first operational amplifier is the input end of the phase amplitude compensation circuit, the second end of the first compensation resistor, the second end of the first compensation capacitor, the first end of the second compensation resistor and the first end of the second compensation capacitor are respectively connected with the inverting input end of the first operational amplifier, the first end of the first compensation resistor and the first end of the first compensation capacitor are grounded, the second end of the second compensation capacitor and the second end of the second compensation resistor are connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is the output end of the phase amplitude compensation circuit.
In one embodiment, the system further comprises a first resistor, a first end of the first resistor is connected with the output end of the phase amplitude compensation circuit, and a second end of the first resistor is connected with the input end of the crystal oscillator.
Compared with the prior art, the embodiment of the application has the beneficial effects that: the frequency compensation system of the crystal oscillator with amplitude phase compensation provided by the embodiment of the application detects the acceleration of the crystal oscillator through the acceleration sensor, then carries out acceleration compensation through the acceleration compensation circuit to obtain acceleration compensation voltage, and finally carries out amplitude and phase compensation on the acceleration compensation voltage through the phase amplitude compensation circuit to obtain final compensation voltage, so that the final compensation voltage can reduce amplitude and phase deviation of a voltage signal of the acceleration sensor for monitoring the vibration intensity of the crystal oscillator, thereby reducing the frequency variation of the crystal oscillator, expanding the frequency compensation range of the crystal oscillator, and further optimizing the near-end dynamic phase noise of the crystal oscillator.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a frequency compensation system of a crystal oscillator with amplitude phase compensation according to an embodiment of the present application;
FIG. 2 is a schematic diagram showing frequency variation before and after frequency compensation of a crystal oscillator according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a frequency compensation system with an amplitude-phase compensated crystal oscillator according to an embodiment of the present application
FIG. 4 is a schematic circuit diagram of an acceleration compensation circuit and a phase amplitude compensation circuit according to an embodiment of the present application;
fig. 5 is a graph comparing phase noise curves before and after amplitude phase compensation according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
In order to illustrate the technical scheme of the application, the following description is made by specific examples.
Referring to fig. 1, fig. 1 shows a schematic diagram of a frequency compensation system 10 of a crystal oscillator with amplitude phase compensation according to an embodiment of the present application, which includes: an acceleration sensor 11, an acceleration compensation circuit 12, and a phase amplitude compensation circuit 13;
the output end of the acceleration sensor 11 is connected with the input end of the acceleration compensation circuit 12, the output end of the acceleration compensation circuit 12 is connected with the input end of the phase amplitude compensation circuit 13, and the output end of the phase amplitude compensation circuit 13 is connected with a crystal oscillator;
the acceleration sensor 11 is configured to detect an acceleration of the crystal oscillator, obtain an acceleration voltage signal, and send the acceleration voltage signal to the acceleration compensation circuit 12;
the acceleration compensation circuit 12 is configured to generate an acceleration compensation voltage according to the acceleration voltage signal, and send the acceleration compensation voltage to the phase amplitude compensation circuit 13;
the phase amplitude compensation circuit 13 is configured to perform amplitude compensation and phase compensation on the acceleration compensation voltage to obtain a final compensation voltage, and send the final compensation voltage to the crystal oscillator, so that the crystal oscillator generates a compensation frequency for reducing a frequency offset according to the final compensation voltage.
In the present embodiment, as shown in fig. 1, the crystal oscillator 20 includes a crystal resonator CRY, a first capacitor Cn1, a second capacitor Cn2, a first crystal oscillator resistor Rn1, and an oscillation circuit 21. The first end of the crystal resonator CRY is connected to the oscillating circuit 21 through the first capacitor Cn1, the second end is connected to the oscillating circuit 21 through the second capacitor Cn2 in parallel with the first crystal oscillator resistor Rn1, and one end of the second capacitor Cn2 connected to the first crystal oscillator resistor Rn1 and the oscillating circuit 21 is grounded. The first capacitor Cn1 and the second capacitor Cn2 are used for isolating the dc voltage and coupling the ac signal, respectively. The output of the phase amplitude compensation circuit 13 of the frequency compensation system is connected to a first terminal of the crystal resonator CRY via a first resistor Ro, thereby providing an acceleration compensation voltage to the crystal oscillator 20.
In this embodiment, when the crystal oscillator 20 is vibrated, a minute frequency change occurs, and the phase noise is deteriorated. The acceleration sensor 11 can monitor the characteristic of the vibration intensity of the crystal oscillator 20 from low frequency to high frequency in real time, the acceleration sensor 11 obtains an acceleration voltage signal corresponding to the vibration intensity, and sends the acceleration voltage signal to the acceleration compensation circuit 12, the acceleration compensation circuit 12 performs acceleration compensation on the acceleration voltage signal, and the obtained acceleration compensation voltage can control the crystal oscillator 20 to generate a frequency opposite to the oscillation frequency of the crystal oscillator 20.
As shown in fig. 2, fig. 2 shows a frequency variation diagram of the crystal oscillator 20 before and after frequency compensation, wherein a curve a is a frequency variation curve of the crystal oscillator before acceleration compensation, a curve b is a frequency variation curve of the crystal oscillator after acceleration compensation, and a curve c is a frequency variation curve corresponding to the acceleration compensation voltage. It can be seen that the frequency variation before frequency compensation is exactly opposite to the frequency variation direction generated by the acceleration compensation voltage, so that the frequency variation of the crystal oscillator 20 after frequency compensation is reduced, and finally the near-end dynamic phase noise of the crystal oscillator 20 is optimized.
In this embodiment, since the acceleration sensor 11 has a fixed resonance frequency, which is generally within 1500Hz, the amplitude and phase deviation of the voltage signal used by the acceleration sensor 11 to monitor the vibration intensity of the crystal oscillator are affected by the resonance frequency of the acceleration sensor 11, the frequency compensation range can only reach about 100Hz, and the frequency compensation effect is poor.
In view of this, the present embodiment compensates the phase and amplitude of the acceleration compensation voltage compensated by the acceleration compensation circuit 12 by the phase and amplitude compensation circuit, so as to compensate the influence of the resonance frequency of the acceleration sensor 11, thereby expanding the frequency compensation range and optimizing the frequency compensation effect.
FIG. 3 is a schematic diagram of a frequency compensation system of a crystal oscillator with amplitude phase compensation according to the present embodiment, and as shown in FIG. 3, in one embodiment, the acceleration compensation circuit 12 includes an initial compensation module 121, a direction compensation module 122, and a phase noise detection module 123;
the initial compensation module 121 is configured to obtain an initial compensation voltage according to the acceleration voltage signal; and sends the initial compensation voltage to the direction compensation module 122;
the phase noise detection module 123 is configured to detect phase noise of the crystal oscillator after the frequency compensation in the previous period, obtain a level control signal according to the phase noise, and feed back the level control signal to the direction compensation module 122;
the direction compensation module 122 is configured to generate an acceleration compensation voltage according to the initial compensation voltage and the level control signal.
In this embodiment, the acceleration sensor 11 obtains an acceleration voltage signal corresponding to the vibration intensity, and sends the acceleration voltage signal to the initial compensation module 121, so that the initial compensation module 121 performs voltage compensation on the acceleration voltage signal, the phase noise detection module 123 determines the direction of the final compensation voltage acting on the crystal oscillator according to the detected phase noise of the crystal oscillator, and the direction compensation module 122 obtains the acceleration compensation voltage according to the direction of the final compensation voltage fed back by the phase noise detection module 123 and the initial compensation voltage, so that the oscillation frequency of the crystal oscillator corresponding to the acceleration compensation voltage is opposite to the oscillation frequency generated by the crystal oscillator itself.
In one embodiment, the acceleration compensation voltage includes a first compensation voltage and a second compensation voltage; the direction compensation module 122 includes a conversion relay, a normal phase output unit, and an inverse phase output unit;
the movable contact of the conversion relay is connected with the output end of the initial compensation module 121, the first stationary contact of the conversion relay is connected with the input end of the normal phase output unit, the second stationary contact of the conversion relay is connected with the input end of the reverse phase output unit, and the output end of the normal phase output unit and the output end of the reverse phase output unit are respectively connected with the input end of the phase amplitude compensation circuit 13; the movable contact and the first fixed contact form a normally closed switch, and the movable contact and the second fixed contact form a normally open switch;
the switching relay is used for switching the switching states of the normally open switch and the normally closed switch according to the level control signal fed back by the phase noise detection module 123;
the normal phase output unit obtains the first compensation voltage according to the initial compensation voltage;
the inverting output unit obtains the second compensation voltage according to the initial compensation voltage.
In the present embodiment, since it is necessary to output a compensation voltage in the opposite direction to the crystal oscillator 20 to cancel out the frequency generated by the vibration of the crystal oscillator 20, it is necessary to detect the phase noise generated when the crystal oscillator 20 oscillates.
Specifically, if the phase noise is significantly reduced after the frequency compensation is detected, it is indicated that the frequency direction generated after the acceleration compensation voltage outputted by the frequency compensation system acts on the crystal oscillator 20 is opposite to the frequency change direction when the crystal oscillator 20 is not compensated, so that the normal phase output unit (reverse phase output unit) in the direction compensation module 122 used in the above period can be continuously used for direction compensation; if the phase noise change after the frequency compensation is not obvious, it indicates that the frequency change direction generated after the acceleration compensation voltage outputted by the frequency compensation system acts on the crystal oscillator 20 is the same as the frequency change direction before the crystal oscillator 20 is not compensated, the output unit in the direction compensation module 122 needs to be changed at this time, for example, if the initial compensation module 121 in the previous period is connected with the normal phase output unit, the initial compensation module 121 is connected with the reverse phase output unit through the conversion relay K1, and the connection between the initial compensation module 121 and the normal phase output unit is disconnected.
In this embodiment, the conversion relay K1 is used to connect the normal phase output unit and the reverse phase output unit of the initial compensation module 121 and the direction compensation module 122, where the conversion relay K1 includes three contacts, one is a moving contact, and the other is a fixed contact, and the moving contact is connected to the output end of the initial compensation module 121, and the first fixed contact is connected to the normal phase output unit, so that the moving contact and the first fixed contact form a normally open switch, and the second fixed contact is connected to the reverse phase output unit, so that the moving contact and the second fixed contact form a normally closed switch. The initial compensation module 121 is connected with the normal phase output unit through a normally closed switch, and the initial compensation module 121 is connected with the reverse phase output unit through a normally open switch of the conversion relay K1.
When the conversion relay K1 acquires a low-level signal, the movable contact is connected with the first stationary contact, the normally open switch is turned on, the normally closed switch is turned off, and the initial compensation voltage output by the initial compensation module 121 is sent to the normal phase output unit, and the normal phase output unit outputs the initial compensation voltage to the phase amplitude compensation circuit in normal phase. When the conversion relay K1 acquires a high-level signal, the movable contact is turned to the second stationary contact, the movable contact is connected with the second stationary contact, the normally open switch is turned off, the normally closed switch is turned on, the initial compensation voltage output by the initial compensation module 121 is sent to the reverse output unit, the reverse output unit reverses the initial compensation voltage, and the obtained acceleration compensation voltage is sent to the phase amplitude compensation circuit.
In one embodiment of the present application, the first stationary contact may be further connected to the inverting output unit, so that the initial compensation module 121 is connected to the inverting output unit through a normally open switch; the second stationary contact is connected to the normal phase output unit, so that the initial compensation module 121 is connected to the normal phase output unit through a normally closed switch.
In one embodiment, the level control signal includes a high level signal and a low level signal, and the phase noise detection module 123 includes a phase noise detector 1231 and a control unit 1232;
the phase noise detector 1231 is configured to detect a first phase noise of the crystal oscillator 20 that is not frequency compensated and a second phase noise of the crystal oscillator 20 that is frequency compensated in a previous period, and send the first phase noise and the second phase noise to the control unit 1232;
the control unit 1232 is configured to perform a difference between the first phase noise and the second phase noise to obtain a noise difference value, output the high-level signal if the noise difference value is smaller than a noise difference threshold, and output the low-level signal if the noise difference value is greater than or equal to the noise difference threshold.
In this embodiment, as shown in fig. 3, the phase noise detector 1231 monitors the phase noise of the crystal oscillator 20, wherein the first phase noise is the noise generated when the crystal oscillator that is not frequency compensated vibrates, and the second phase noise is the noise generated by the crystal oscillator after frequency compensation by the final compensation voltage corresponding to the acceleration compensation voltage generated by the output unit corresponding to the normally closed switch. The first phase noise and the second phase noise are transmitted to the control unit 1232. The control unit 1232 obtains a noise difference according to the first phase noise and the second phase noise, and if the noise difference is smaller than the noise difference threshold, it indicates that the phase noise of the crystal oscillator 20 is not significantly changed, and the output unit of the direction compensation module 122 needs to be changed, so that the switching state of the switching relay K1 is changed by outputting a high level, and if the noise difference is greater than or equal to the noise difference threshold, it indicates that the phase noise of the crystal oscillator 20 is significantly reduced, and the current compensation direction of the output unit is correct, so that the switching state of the switching relay K1 is not changed by outputting a low level signal.
In one embodiment, the acceleration sensor 11 is a three-axis acceleration sensor.
In one embodiment, the acceleration voltage signal includes an X-axis voltage component, a Y-axis voltage component, and a Z-axis voltage component; the initial compensation module 121 includes a first amplifying unit, a second amplifying unit, a third amplifying unit, and an adding unit;
the input end of the first amplifying unit is connected with the X-axis output end of the triaxial acceleration sensor, and the output end of the first amplifying unit is connected with the input end of the adding unit;
the input end of the second amplifying unit is connected with the Y-axis output end of the triaxial acceleration sensor, and the output end of the second amplifying unit is connected with the input end of the adding unit;
the input end of the third amplifying unit is connected with the Z-axis output end of the triaxial acceleration sensor, and the output end of the third amplifying unit is connected with the input end of the adding unit.
In this embodiment, a triaxial acceleration sensor having three directions X, Y and Z is used to monitor the acceleration value of the vibration intensity of the crystal oscillator 20 in real time. The acceleration voltage signals output by the acceleration sensor 11 in the directions perpendicular to each other in X, Y and Z are amplified and summed to obtain an initial compensation voltage.
In the present embodiment, fig. 4 shows a schematic circuit diagram of an acceleration compensation circuit 12 and a phase amplitude compensation circuit in a frequency compensation system of a crystal oscillator with amplitude phase compensation, and as shown in fig. 4, a port X, Y, Z in fig. 4 is an X-axis output terminal, a Y-axis output terminal and a Z-axis output terminal of the acceleration sensor 11, respectively.
In this embodiment, the first amplifying unit includes a first amplifying resistor R1, a second amplifying resistor R2, a third amplifying resistor R3, a fourth amplifying resistor R4, and a second operational amplifier OP1;
the first end of the first amplifying resistor R1 is an input end of the first amplifying unit, and the second end of the first amplifying resistor R1 is connected with the non-inverting input end of the second operational amplifier OP1; the inverting input end of the second operational amplifier OP1 is connected with the first end of the second amplifying resistor R2 and the first end of the third amplifying resistor R3 respectively; the second end of the second amplifying resistor R2 is grounded, the second end of the third amplifying resistor R3 is connected with the output end of the second operational amplifier OP1 and the first end of the fourth amplifying resistor R4, respectively, and the second end of the fourth amplifying resistor R4 is the output end of the first amplifying unit.
In this embodiment, the second amplifying unit and the third amplifying unit have the same structure as the first amplifying unit.
Specifically, the second amplifying unit includes a fifth amplifying resistor R5, a sixth amplifying resistor R6, a seventh amplifying resistor R7, an eighth amplifying resistor R8, and a third operational amplifier OP2; the third amplifying unit comprises a ninth amplifying resistor R9, a tenth amplifying resistor R10, an eleventh amplifying resistor R11, a twelfth amplifying resistor R12 and a fourth operational amplifier OP3; the first end of the fifth amplifying resistor R5 is an input end of the second amplifying unit, and the second end of the fifth amplifying resistor R5 is connected with the non-inverting input end of the third operational amplifier OP2; the inverting input end of the third operational amplifier OP2 is connected to the first end of the sixth amplifying resistor R6 and the first end of the seventh amplifying resistor R7, respectively; the second end of the sixth amplifying resistor R6 is grounded, the second end of the seventh amplifying resistor R7 is connected with the output end of the third operational amplifier OP2 and the first end of the eighth amplifying resistor R8, respectively, and the second end of the eighth amplifying resistor R8 is the output end of the second amplifying unit;
the first end of the ninth amplifying resistor R9 is an input end of the third amplifying unit, and the second end of the ninth amplifying resistor R9 is connected with the non-inverting input end of the fourth operational amplifier OP3; the inverting input terminal of the fourth operational amplifier OP3 is connected to the first terminal of the tenth amplifying resistor R10 and the first terminal of the eleventh amplifying resistor R11, respectively; the second end of the tenth amplifying resistor R10 is grounded, the second end of the eleventh amplifying resistor R11 is connected to the output end of the fourth operational amplifier OP3 and the first end of the twelfth amplifying resistor R12, respectively, and the second end of the twelfth amplifying resistor R12 is the output end of the third amplifying unit.
In one embodiment, the adding unit includes a first adding resistor R13, a second adding resistor R14, a third adding resistor R15, and a fifth operational amplifier OP4;
the non-inverting input end of the fifth operational amplifier OP4 is an input end of the adding unit, and the non-inverting input end of the fifth operational amplifier OP4 is grounded through the first adding resistor R13; the inverting input end of the fifth operational amplifier OP4 is respectively connected with the first end of the second adding resistor R14 and the first end of the third adding resistor R15, the second end of the second adding resistor R14 is grounded, the second end of the third adding resistor R15 is connected with the output end of the fifth operational amplifier OP4, and the output end of the fifth operational amplifier OP4 is the output end of the adding unit.
In one embodiment, the non-inverting output unit includes a first output resistor R16.
In one embodiment, the inverting output unit includes an inverter.
In the present embodiment, the inverter includes a second output resistor R17, a third output resistor R18, and a sixth operational amplifier OP5;
the first end of the second output resistor R17 is an input end of the inverter, the second end of the second output resistor R17 is connected with the inverting input end of the sixth operational amplifier OP5 and the first end of the third output resistor R18, the non-inverting input end of the sixth operational amplifier OP5 is grounded, the second end of the third output resistor R18 is connected with the output end of the sixth operational amplifier OP5, and the output end of the sixth operational amplifier OP5 is an output end of the inverter.
In one embodiment, the phase amplitude compensation circuit includes a first compensation resistor R19, a second compensation resistor R20, a first compensation capacitor C1, a second compensation capacitor C2, and a first operational amplifier OP6;
the non-inverting input end of the first operational amplifier OP6 is the input end of the phase amplitude compensation circuit, the second end of the first compensation resistor R19, the second end of the first compensation capacitor C1, the first end of the second compensation resistor R20 and the first end of the second compensation capacitor C2 are respectively connected with the inverting input end of the first operational amplifier OP6, the first end of the first compensation resistor R19 and the first end of the first compensation capacitor C1 are grounded, the second end of the second compensation capacitor C2 and the second end of the second compensation resistor R20 are respectively connected with the output end of the first operational amplifier OP6, and the output end of the first operational amplifier OP6 is the output end of the phase amplitude compensation circuit.
In the present embodiment, the gain of the acceleration compensation voltage is adjusted by the first compensation resistor R19 and the second compensation resistor R20, so as to change the amplitude of the acceleration compensation voltage, and the phase of the acceleration compensation voltage is adjusted by the first compensation capacitor C1 and the second compensation capacitor C2, so as to realize the amplitude and phase compensation of the acceleration compensation voltage.
In this embodiment, as shown in fig. 5, fig. 5 is a graph comparing phase noise curves before and after amplitude phase compensation. In fig. 5, the abscissa indicates the frequency, the ordinate indicates the noise difference (the value obtained by subtracting the second phase noise from the first phase noise), the curve C1 is a phase noise variation curve generated by directly applying the acceleration compensation voltage to the crystal oscillator, and the curve C2 is a phase noise variation curve generated by applying the final compensation voltage to the crystal oscillator, as can be seen from fig. 5, the compensation frequency range after the amplitude phase compensation is wider, and the noise difference corresponding to the final compensation voltage is larger at the same frequency, that is, the frequency compensation effect after the amplitude phase compensation is better.
In one embodiment, the system further comprises a first resistor Ro, a first terminal of the first resistor Ro being connected to the output of the phase amplitude compensation circuit, and a second terminal of the first resistor Ro being connected to the input of the crystal oscillator 20.
In this embodiment, the input terminal of the crystal oscillator is the first terminal of the crystal resonator.
The frequency compensation system provided by the application adopts a frequency voltage control mode to carry out frequency voltage control on the crystal oscillator 20, so that the frequency variation during vibration of the crystal oscillator 20 can be reduced, and meanwhile, the amplitude and phase compensation module is used for carrying out amplitude and phase compensation on the acceleration voltage, thereby reducing the influence of the resonance frequency of the acceleration sensor 11 on the frequency compensation range, expanding the frequency compensation range, optimizing the frequency compensation effect and finally realizing the purpose of optimizing the dynamic phase noise of the crystal oscillator 20.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (9)
1. A frequency compensation system for a crystal oscillator having amplitude phase compensation, comprising: an acceleration sensor, an acceleration compensation circuit and a phase amplitude compensation circuit;
the output end of the acceleration sensor is connected with the input end of the acceleration compensation circuit, the output end of the acceleration compensation circuit is connected with the input end of the phase amplitude compensation circuit, and the output end of the phase amplitude compensation circuit is connected with the crystal oscillator;
the acceleration sensor is used for detecting the acceleration of the crystal oscillator to obtain an acceleration voltage signal, and sending the acceleration voltage signal to the acceleration compensation circuit;
the acceleration compensation circuit is used for generating an acceleration compensation voltage according to the acceleration voltage signal and sending the acceleration compensation voltage to the phase amplitude compensation circuit;
the phase amplitude compensation circuit is used for carrying out amplitude compensation and phase compensation on the acceleration compensation voltage to obtain final compensation voltage, and sending the final compensation voltage to the crystal oscillator so that the crystal oscillator generates compensation frequency for reducing frequency offset according to the final compensation voltage;
the acceleration compensation circuit comprises an initial compensation module, a direction compensation module and a phase noise detection module;
the initial compensation module is used for obtaining initial compensation voltage according to the acceleration voltage signal; and sending the initial compensation voltage to the direction compensation module;
the phase noise detection module is used for detecting the phase noise of the crystal oscillator after the frequency compensation in the previous period, obtaining a level control signal according to the phase noise, and feeding back the level control signal to the direction compensation module;
the direction compensation module is used for generating acceleration compensation voltage according to the initial compensation voltage and the level control signal.
2. The frequency compensation system of a crystal oscillator with amplitude phase compensation of claim 1, wherein the acceleration compensation voltage comprises a first compensation voltage and a second compensation voltage; the direction compensation module comprises a conversion type relay, a normal phase output unit and an opposite phase output unit;
the movable contact of the conversion type relay is connected with the output end of the initial compensation module, the first fixed contact of the conversion type relay is connected with the input end of the normal phase output unit, the second fixed contact of the conversion type relay is connected with the input end of the reverse phase output unit, and the output end of the normal phase output unit and the output end of the reverse phase output unit are respectively connected with the input end of the phase amplitude compensation circuit; the movable contact and the first fixed contact form a normally closed switch, and the movable contact and the second fixed contact form a normally open switch;
the conversion relay is used for converting the switch states of the normally open switch and the normally closed switch according to the level control signal fed back by the phase noise detection module;
the normal phase output unit obtains the first compensation voltage according to the initial compensation voltage;
the inverting output unit obtains the second compensation voltage according to the initial compensation voltage.
3. The system of claim 1, wherein the level control signal comprises a high level signal and a low level signal, and the phase noise detection module comprises a phase noise detector and a control unit;
the phase noise detector is used for detecting first phase noise of the crystal oscillator which is not subjected to frequency compensation and second phase noise of the crystal oscillator which is subjected to frequency compensation in the previous period, and sending the first phase noise and the second phase noise to the control unit;
the control unit is used for carrying out difference on the first phase noise and the second phase noise to obtain a noise difference value, outputting the high-level signal if the noise difference value is smaller than a noise difference threshold value, and outputting the low-level signal if the noise difference value is larger than or equal to the noise difference threshold value.
4. The system for frequency compensation of a crystal oscillator with amplitude phase compensation of claim 1, wherein the acceleration sensor is a tri-axis acceleration sensor.
5. The frequency compensation system of a crystal oscillator with amplitude phase compensation of claim 4, wherein the acceleration voltage signal comprises an X-axis voltage component, a Y-axis voltage component, and a Z-axis voltage component; the initial compensation module comprises a first amplification unit, a second amplification unit, a third amplification unit and an addition unit;
the input end of the first amplifying unit is connected with the X-axis output end of the triaxial acceleration sensor, the output end of the first amplifying unit is connected with the input end of the adding unit, and the first amplifying unit is used for amplifying the X-axis voltage component;
the input end of the second amplifying unit is connected with the Y-axis output end of the triaxial acceleration sensor, the output end of the second amplifying unit is connected with the input end of the adding unit, and the second amplifying unit is used for amplifying the Y-axis voltage component;
the input end of the third amplifying unit is connected with the Z-axis output end of the triaxial acceleration sensor, the output end of the third amplifying unit is connected with the input end of the adding unit, and the third amplifying unit is used for amplifying the Z-axis voltage component;
the adding unit is used for summing the amplified X-axis voltage component, the amplified Y-axis voltage component and the amplified Z-axis voltage component to obtain an initial compensation voltage.
6. The frequency compensation system of a crystal oscillator with amplitude phase compensation of claim 2, wherein the normal phase output unit includes a first output resistor.
7. The frequency compensation system of a crystal oscillator with amplitude phase compensation of claim 2, wherein the inverting output unit comprises an inverter.
8. The frequency compensation system of a crystal oscillator with amplitude phase compensation of any one of claims 1 to 7, wherein the phase amplitude compensation circuit comprises a first compensation resistor, a second compensation resistor, a first compensation capacitor, a second compensation capacitor, and a first operational amplifier;
the non-inverting input end of the first operational amplifier is the input end of the phase amplitude compensation circuit, the second end of the first compensation resistor, the second end of the first compensation capacitor, the first end of the second compensation resistor and the first end of the second compensation capacitor are respectively connected with the inverting input end of the first operational amplifier, the first end of the first compensation resistor and the first end of the first compensation capacitor are grounded, the second end of the second compensation capacitor and the second end of the second compensation resistor are connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is the output end of the phase amplitude compensation circuit.
9. The system of claim 1 to 7, further comprising a first resistor, a first terminal of the first resistor being connected to an output of the phase amplitude compensation circuit, and a second terminal of the first resistor being connected to an input of the crystal oscillator.
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