CN111130458A - Frequency compensation system of crystal oscillator based on acceleration compensation technology - Google Patents
Frequency compensation system of crystal oscillator based on acceleration compensation technology Download PDFInfo
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- CN111130458A CN111130458A CN201911301656.6A CN201911301656A CN111130458A CN 111130458 A CN111130458 A CN 111130458A CN 201911301656 A CN201911301656 A CN 201911301656A CN 111130458 A CN111130458 A CN 111130458A
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- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
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Abstract
The invention is suitable for the technical field of crystal oscillators, and provides a frequency compensation system of a crystal oscillator based on an acceleration compensation technology, which comprises: the device comprises an acceleration sensor, an initial compensation module, a direction compensation module and a phase noise detection module; the acceleration of the crystal oscillator is detected through the acceleration sensor, then the initial compensation voltage is carried out on an acceleration voltage signal through the initial compensation module, the final compensation voltage of the crystal oscillator is determined through the direction compensation module according to the phase noise of the crystal oscillator after frequency compensation and the initial compensation voltage, and the compensation voltage acts on the frequency generated when the crystal oscillator can counteract the vibration of the crystal oscillator, so that the frequency change of the crystal oscillator is reduced, and the near-end dynamic phase noise of the crystal oscillator is optimized.
Description
Technical Field
The invention belongs to the technical field of crystal oscillators, and particularly relates to a frequency compensation system of a crystal oscillator based on an acceleration compensation technology.
Background
The crystal oscillator has the characteristics of high frequency stability and low phase noise, and is generally widely applied to vehicle-mounted, airborne, missile-borne and other aerospace military electronic systems as a reference signal source of the system. A crystal oscillator is a very vibration sensitive device, and its electrical performance index, especially phase noise, is severely deteriorated under vibration conditions. The greater the vibration intensity, the greater the dynamic phase noise deterioration.
The current common solution is to adopt a mechanical vibration reduction mode, reduce the vibration intensity of the crystal oscillator by damping the crystal oscillator through a vibration absorber, thereby reducing the deterioration of the dynamic phase noise of the crystal oscillator. However, the mechanical vibration damping system has a problem of the resonance frequency of the vibration damper, and has a damping effect on vibrations above the resonance frequency, but has no damping effect on vibrations at or below the resonance frequency, and may even generate resonance at the resonance frequency to amplify the vibration intensity. In addition, the frequency range of the conventional vibration condition is 10-2000Hz, and the resonance frequency of the vibration damper is difficult to design below 10Hz, so that the mechanical vibration damping mode has the problem that the near-end dynamic phase noise within 100Hz cannot be optimized.
Disclosure of Invention
In view of this, an embodiment of the present invention provides a frequency compensation system of a crystal oscillator based on an acceleration compensation technology, so as to solve a problem that a mechanical damping manner in the prior art cannot optimize a low-frequency-band near-end dynamic phase noise.
The embodiment of the invention provides a frequency compensation system of a crystal oscillator based on an acceleration compensation technology, which comprises: the device comprises an acceleration sensor, an initial compensation module, a direction compensation module and a phase noise detection module;
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 initial compensation module;
the initial compensation module is used for obtaining an initial compensation voltage according to the acceleration voltage signal; 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 the level control signal back to the direction compensation module;
the direction compensation module is used for generating a compensation voltage according to the initial compensation voltage and the level control signal and sending the compensation voltage to the crystal oscillator so that the crystal oscillator generates a compensation frequency for reducing frequency deviation according to the compensation voltage.
In one embodiment, the 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 inverse phase output unit;
the movable contact of the conversion type relay is connected with the output end of the initial compensation module, the first stationary contact of the conversion type relay is connected with the input end of the normal phase output unit, the second stationary contact of the conversion type relay is connected with the input end of the reverse phase output unit, the movable contact and the first stationary contact form a normally closed switch, and the movable contact and the second stationary contact form a normally open switch;
the conversion type relay is used for converting the switch states of the normally open switch and the normally closed switch according to a 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 and sends the first compensation voltage to the crystal oscillator;
and the inverting output unit obtains the second compensation voltage according to the initial compensation voltage and sends the second compensation voltage to the crystal oscillator.
In one embodiment, 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 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 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 amplification unit is connected with the X-axis output end of the three-axis acceleration sensor, the output end of the first amplification unit is connected with the input end of the addition unit, and the first amplification 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 three-axis 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 amplification unit is connected with the Z-axis output end of the three-axis acceleration sensor, the output end of the third amplification unit is connected with the input end of the addition unit, and the third amplification unit is used for amplifying the Z-axis voltage component;
the addition 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 first amplifying unit includes a first amplifying resistor, a second amplifying resistor, a third amplifying resistor, a fourth amplifying resistor, and a first operational amplifier;
a first end of the first amplifying resistor is an input end of the first amplifying unit, and a second end of the first amplifying resistor is connected with a non-inverting input end of the first operational amplifier; the inverting input end of the first operational amplifier is respectively connected with the first end of the second amplifying resistor and the first end of the third amplifying resistor; the second end of the second amplifying resistor is grounded, the second end of the third amplifying resistor is respectively connected with the output end of the first operational amplifier and the first end of the fourth amplifying resistor, and the second end of the fourth amplifying resistor is the output end of the first amplifying unit.
In one embodiment, the second amplification unit and the third amplification unit have the same structure as the first amplification unit.
In one embodiment, the addition unit includes a first addition resistor, a second addition resistor, a third addition resistor, and a fourth operational amplifier;
the non-inverting input end of the fourth operational amplifier is the input end of the addition unit, and the non-inverting input end of the fourth operational amplifier is grounded through the first addition resistor; the inverting input end of the fourth operational amplifier is connected to the first end of the second summing resistor and the first end of the third summing resistor, respectively, the second end of the second summing resistor is grounded, the second end of the third summing resistor is connected to the output end of the fourth operational amplifier, and the output end of the fourth operational amplifier is the output end of the summing unit.
In one embodiment, the non-inverting output unit includes a first output resistor.
In one embodiment, the inverting output unit includes an inverter.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the frequency compensation system of the crystal oscillator based on the acceleration compensation technology provided by the embodiment of the invention detects the acceleration of the crystal oscillator through the acceleration sensor, then carries out initial compensation voltage on an acceleration voltage signal through the initial compensation module, and then determines the final compensation voltage of the crystal oscillator according to the phase noise of the crystal oscillator after frequency compensation and the initial compensation voltage through the direction compensation module, wherein the compensation voltage acts on the crystal oscillator to offset the frequency generated when the crystal oscillator vibrates, so that the frequency change of the crystal oscillator is reduced, and the near-end dynamic phase noise of the crystal oscillator is optimized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a frequency compensation system of a crystal oscillator based on an acceleration compensation technique according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of frequency variations before and after frequency compensation of a crystal oscillator according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an initial compensation module and a directional compensation module according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention 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 invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
As shown in fig. 1, fig. 1 shows a schematic structural diagram of a frequency compensation system 10 of a crystal oscillator based on an acceleration compensation technique, which includes: the device comprises an acceleration sensor 11, an initial compensation module 12, a direction compensation module 13 and a phase noise detection module 14;
the acceleration sensor 11 is configured to detect an acceleration of the crystal oscillator 20 to obtain an acceleration voltage signal, and send the acceleration voltage signal to the initial compensation module 12;
the initial compensation module 12 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 13;
the phase noise detection module 14 is configured to detect a phase noise of the crystal oscillator 20 after frequency compensation in a previous period, obtain a level control signal according to the phase noise, and feed back the level control signal to the direction compensation module 13;
the direction compensation module 13 is configured to generate a compensation voltage according to the initial compensation voltage and the level control signal, and send the compensation voltage to the crystal oscillator 20, so that the crystal oscillator 20 generates a compensation frequency for reducing frequency offset according to the compensation voltage.
In the present embodiment, the circuit structure of the crystal oscillator 20 is as shown in fig. 1, and the crystal oscillator 20 includes a crystal resonator CRY, a first capacitor Cn1, a second capacitor Cn2, a first crystal resistor Rn1, and an oscillation circuit 21. The first end of the crystal resonator CRY is connected to the oscillation circuit 21 through the first capacitor Cn1, the second end is connected to the oscillation circuit 21 through the second capacitor Cn2 connected in parallel to the first crystal resistor Rn1, and the end of the second capacitor Cn2 connected to the oscillation circuit 21 and the first crystal resistor Rn1 is grounded. The first capacitor Cn1 and the second capacitor Cn2 are used for isolating direct current voltage and coupling alternating current signals respectively. The output terminal of the directional compensation module 13 of the frequency compensation system is connected to the first terminal of the crystal resonator CRY via the first resistor Ro, thereby providing a compensation voltage to the crystal oscillator 20.
In the present embodiment, the crystal oscillator 20 generates a slight frequency change when it is vibrated, thereby deteriorating phase noise. The acceleration sensor 11 can monitor the characteristics 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 initial compensation module 12, so that the initial compensation module 12 performs voltage compensation on the acceleration voltage signal, and the direction compensation module 13 converts the direction of the compensation voltage, so that the compensation voltage output to the crystal oscillator 20 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 graph of the crystal oscillator 20, where a curve a is a frequency variation curve of the crystal oscillator before frequency compensation, a curve b is a frequency variation curve of the crystal oscillator after frequency compensation, and a curve c is a frequency variation curve corresponding to the compensation voltage. It can be seen that the frequency change before frequency compensation is in the opposite direction to the frequency change generated by the compensation voltage, so that the frequency change 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.
FIG. 3 is a schematic diagram of the circuit structure of the initial compensation module and the direction compensation module, as shown in FIG. 3, wherein the compensation voltage includes a first compensation voltage and a second compensation voltage in one embodiment; the direction compensation module 13 comprises a conversion type relay K1, a positive phase output unit and a negative phase output unit;
the movable contact of the conversion type relay K1 is connected with the output end of the initial compensation module 12, the first stationary contact of the conversion type relay K1 is connected with the input end of the positive phase output unit, the second stationary contact of the conversion type relay K1 is connected with the input end of the negative phase output unit, the movable contact and the first stationary contact form a normally closed switch, and the movable contact and the second stationary contact form a normally open switch;
the conversion type relay K1 is used for converting the switch states of the normally open switch and the normally closed switch according to a level control signal fed back by the phase noise detector;
the normal phase output unit obtains the first compensation voltage according to the initial compensation voltage, and sends the first compensation voltage to the crystal oscillator 20;
the inverting output unit obtains the second compensation voltage according to the initial compensation voltage, and sends the second compensation voltage to the crystal oscillator 20.
In the present embodiment, since it is necessary to output a compensation voltage having an opposite direction to the crystal oscillator 20 to cancel the frequency generated by the oscillation of the crystal oscillator 20, it is necessary to detect the phase noise generated when the crystal oscillator 20 oscillates.
Specifically, if it is detected that the phase noise is significantly reduced after the frequency compensation, it indicates that the frequency direction generated after the compensation voltage outputted by the frequency compensation system is applied to 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 (inverted phase output unit) in the direction compensation module 13 used in the above cycle can continue to perform the direction compensation; if it is detected that the phase noise change after the frequency compensation is not obvious, it means that the frequency change direction generated after the compensation voltage outputted from the frequency compensation system is applied to the crystal oscillator 20 is the same as the frequency change direction before the compensation of the crystal oscillator 20, and at this time, the output unit in the direction compensation module 13 needs to be changed, for example, if the initial compensation module 12 in the previous cycle is connected to the positive phase output unit, the initial compensation module 12 is connected to the negative phase output unit through the switching relay K1. And disconnects the initial compensation module 12 from the non-inverting output unit.
In this embodiment, the conversion-type relay K1 is used to connect the normal phase output unit and the reverse phase output unit of the initial compensation module 12 and the direction compensation module 13, and the conversion-type relay K1 includes three contacts, one of which is a movable contact and two of which are fixed contacts, and connects the movable contact with the output end of the initial compensation module 12, the first fixed contact is connected with the normal phase output unit, so that the movable contact and the first fixed contact form a normally open switch, the second fixed contact is connected with the reverse phase output unit, and the movable contact and the second fixed contact form a normally closed switch. The initial compensation module 12 is connected with the non-inverting output unit through a normally closed switch, and the initial compensation module 12 is connected with the inverting output unit through a normally open switch of a conversion type relay K1.
When the conversion type relay K1 acquires a low level signal, the movable contact is connected to the first stationary contact, the normally open switch is opened, the normally closed switch is closed, the initial compensation voltage output by the initial compensation module 12 is sent to the normal phase output unit, and the normal phase output unit outputs the initial compensation voltage to the crystal oscillator 20 in a normal phase. When the conversion type relay K1 acquires a high level signal, the moving contact is switched to the second stationary contact and 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 12 is sent to the inverting output unit, the inverting output unit inverts the initial compensation voltage, and the inverted compensation voltage is sent to the crystal oscillator 20.
In an embodiment of the present invention, the first stationary contact may be connected to the inverting output unit, so that the initial compensation module 12 is connected to the inverting output unit through a normally open switch, and the second stationary contact is connected to the non-inverting output unit, so that the initial compensation module 12 is connected to the non-inverting 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 14 includes a phase noise detector and a control unit;
the phase noise detector 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;
the control unit 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 the present embodiment, the phase noise detector monitors the phase noise of the crystal oscillator 20, wherein the first phase noise is the noise generated when the crystal oscillator without frequency compensation vibrates, and the second phase noise is the noise generated when the crystal oscillator vibrates after frequency compensation is performed by the compensation voltage generated by the output unit corresponding to the normally closed switch. The first phase noise and the second phase noise are sent to a control unit. The control unit obtains a noise difference value according to the first phase noise and the second phase noise, if the noise difference value is smaller than a noise difference threshold value, it is indicated that the phase noise of the crystal oscillator 20 does not change significantly, and the output unit of the direction compensation module 13 needs to be changed, so that a high level is output to change the switching state of the switching relay K1, and if the noise difference value is greater than or equal to the noise difference threshold value, it is indicated that the phase noise of the crystal oscillator 20 is significantly reduced, the compensation direction of the current output unit is correct, so that a low level signal is output, and the switching relay K1 does not change the switching state.
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 12 includes a first amplification unit, a second amplification unit, a third amplification unit and an addition unit;
the input end of the first amplification unit is connected with the X-axis output end of the three-axis acceleration sensor, the output end of the first amplification unit is connected with the input end of the addition unit, and the first amplification 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 three-axis 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 amplification unit is connected with the Z-axis output end of the three-axis acceleration sensor, the output end of the third amplification unit is connected with the input end of the addition unit, and the third amplification unit is used for amplifying the Z-axis voltage component;
the addition 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 the present embodiment, a three-axis acceleration sensor having X, Y and Z directions is used to monitor the acceleration of the vibration intensity of the crystal oscillator 20 in real time. The acceleration voltage signals respectively output in X, Y and Z orthogonal directions of the acceleration sensor 11 are subjected to signal amplification and summation to obtain an initial compensation voltage.
In the present embodiment, X, Y, Z ports in fig. 3 are the X-axis output terminal, the Y-axis output terminal and the Z-axis output terminal of the acceleration sensor, respectively.
In one embodiment, the first amplification unit includes a first amplification resistor R1, a second amplification resistor R2, a third amplification resistor R3, a fourth amplification resistor R4, and a first operational amplifier OP 1;
a first terminal of the first amplifying resistor R1 is an input terminal of the first amplifying unit, and a second terminal of the first amplifying resistor R1 is connected to a non-inverting input terminal of the first operational amplifier OP 1; an inverting input terminal of the first operational amplifier OP1 is connected to a first terminal of the second amplifying resistor R2 and a first terminal of the third amplifying resistor R3, respectively; a second end of the second amplifying resistor R2 is grounded, a second end of the third amplifying resistor R3 is connected to the output terminal of the first operational amplifier OP1 and the first end of the fourth amplifying resistor R4, respectively, and a second end of the fourth amplifying resistor R4 is the output terminal of the first amplifying unit.
In one embodiment, the second amplification unit and the third amplification unit have the same structure as the first amplification unit.
In the present embodiment, 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 second operational amplifier OP 2; the third amplifying unit includes a ninth amplifying resistor R9, a tenth amplifying resistor R10, an eleventh amplifying resistor R11, a twelfth amplifying resistor R12, and a third operational amplifier OP 3; a first end of the fifth amplifying resistor R5 is an input end of the second amplifying unit, and a second end of the fifth amplifying resistor R5 is connected to a non-inverting input end of the second operational amplifier OP 2; an inverting input terminal of the second operational amplifier OP2 is connected to a first terminal of the sixth amplifying resistor R6 and a first terminal of the seventh amplifying resistor R7, respectively; a second end of the sixth amplifying resistor R6 is grounded, a second end of the seventh amplifying resistor R7 is connected to the output terminal of the second operational amplifier OP2 and the first end of the eighth amplifying resistor R8, respectively, and a second end of the eighth amplifying resistor R8 is the output terminal of the second amplifying unit;
a first end of the ninth amplifying resistor R9 is an input end of the third amplifying unit, and a second end of the ninth amplifying resistor R9 is connected to a non-inverting input end of the third operational amplifier OP 3; an inverting input terminal of the third operational amplifier OP3 is connected to a first terminal of the tenth amplifying resistor R10 and a first terminal of the eleventh amplifying resistor R11, respectively; a second end of the tenth amplifying resistor R10 is grounded, a second end of the eleventh amplifying resistor R11 is connected to the output terminal of the third operational amplifier OP3 and the first end of the twelfth amplifying resistor R12, respectively, and a second end of the twelfth amplifying resistor R12 is the output terminal of the third amplifying unit.
In one embodiment, the addition unit includes a first addition resistor R13, a second addition resistor R14, a third addition resistor R15, and a fourth operational amplifier OP 4;
a non-inverting input terminal of the fourth operational amplifier OP4 is an input terminal of the adding unit, and a non-inverting input terminal of the fourth operational amplifier OP4 is grounded through the first adding resistor R13; an inverting input terminal of the fourth operational amplifier OP4 is connected to the first terminal of the second summing resistor R14 and the first terminal of the third summing resistor R15, respectively, a second terminal of the second summing resistor R14 is grounded, a second terminal of the third summing resistor R15 is connected to an output terminal of the fourth operational amplifier OP4, and an output terminal of the fourth operational amplifier OP4 is an output terminal of the summing 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 one embodiment, the inverter includes a second output resistor R17, a third output resistor R18, and a fifth operational amplifier OP 5;
a first end of the second output resistor R17 is an input end of the inverter, a second end of the second output resistor R17 is connected to an inverting input end of the fifth operational amplifier OP5 and a first end of the third output resistor R18, a non-inverting input end of the fifth operational amplifier OP5 is grounded, a second end of the third output resistor R18 is connected to an output end of the fifth operational amplifier OP5, and an output end of the fifth operational amplifier OP5 is an output end of the inverter.
In this embodiment, the OUTPUT terminal in fig. 3 is the OUTPUT terminal of the direction compensation module.
In one embodiment, the system further includes a first resistor Ro, a first end of the first resistor Ro is connected to the output terminal of the direction compensation module 13, and a second end of the first resistor Ro is connected to the input terminal 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 of the crystal oscillator 20 during vibration can be reduced, and the aim of optimizing the dynamic phase noise of the crystal oscillator 20 is finally fulfilled.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A frequency compensation system for a crystal oscillator based on acceleration compensation techniques, comprising: the device comprises an acceleration sensor, an initial compensation module, a direction compensation module and a phase noise detection module;
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 initial compensation module;
the initial compensation module is used for obtaining an initial compensation voltage according to the acceleration voltage signal; 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 the level control signal back to the direction compensation module;
the direction compensation module is used for generating a compensation voltage according to the initial compensation voltage and the level control signal and sending the compensation voltage to the crystal oscillator so that the crystal oscillator generates a compensation frequency for reducing frequency deviation according to the compensation voltage.
2. The frequency compensation system of a crystal oscillator based on acceleration compensation technique of claim 1, characterized in that the 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 inverse phase output unit;
the movable contact of the conversion type relay is connected with the output end of the initial compensation module, the first stationary contact of the conversion type relay is connected with the input end of the normal phase output unit, the second stationary contact of the conversion type relay is connected with the input end of the reverse phase output unit, the movable contact and the first stationary contact form a normally closed switch, and the movable contact and the second stationary contact form a normally open switch;
the conversion type relay is used for converting the switch states of the normally open switch and the normally closed switch according to a 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 and sends the first compensation voltage to the crystal oscillator;
and the inverting output unit obtains the second compensation voltage according to the initial compensation voltage and sends the second compensation voltage to the crystal oscillator.
3. The frequency compensation system of the crystal oscillator based on the acceleration compensation technique of claim 2, wherein the level control signal includes a high level signal and a low level signal, 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 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.
4. The frequency compensation system for a crystal oscillator based on acceleration compensation technique of claim 2 wherein said acceleration sensor is a three-axis acceleration sensor.
5. The frequency compensation system of a crystal oscillator based on acceleration compensation technique of claim 4 wherein 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 amplification unit is connected with the X-axis output end of the three-axis acceleration sensor, the output end of the first amplification unit is connected with the input end of the addition unit, and the first amplification 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 three-axis 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 amplification unit is connected with the Z-axis output end of the three-axis acceleration sensor, the output end of the third amplification unit is connected with the input end of the addition unit, and the third amplification unit is used for amplifying the Z-axis voltage component;
the addition 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 the crystal oscillator based on the acceleration compensation technique of claim 5, wherein the first amplification unit includes a first amplification resistor, a second amplification resistor, a third amplification resistor, a fourth amplification resistor, and a first operational amplifier;
a first end of the first amplifying resistor is an input end of the first amplifying unit, and a second end of the first amplifying resistor is connected with a non-inverting input end of the first operational amplifier; the inverting input end of the first operational amplifier is respectively connected with the first end of the second amplifying resistor and the first end of the third amplifying resistor; the second end of the second amplifying resistor is grounded, the second end of the third amplifying resistor is respectively connected with the output end of the first operational amplifier and the first end of the fourth amplifying resistor, and the second end of the fourth amplifying resistor is the output end of the first amplifying unit.
7. The system of claim 5, wherein the second and third amplification units are identical in structure to the first amplification unit.
8. The frequency compensation system of the crystal oscillator based on the acceleration compensation technique of claim 5, wherein the adding unit includes a first adding resistor, a second adding resistor, a third adding resistor, and a fourth operational amplifier;
the non-inverting input end of the fourth operational amplifier is the input end of the addition unit, and the non-inverting input end of the fourth operational amplifier is grounded through the first addition resistor; the inverting input end of the fourth operational amplifier is connected to the first end of the second summing resistor and the first end of the third summing resistor, respectively, the second end of the second summing resistor is grounded, the second end of the third summing resistor is connected to the output end of the fourth operational amplifier, and the output end of the fourth operational amplifier is the output end of the summing unit.
9. The system of claim 2, wherein the non-inverting output unit comprises a first output resistor.
10. The frequency compensation system of a crystal oscillator based on acceleration compensation technique of claim 2, characterized in that the inverting output unit comprises an inverter.
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| CN112953387A (en) * | 2021-02-26 | 2021-06-11 | 江苏上频高新科技有限公司 | Crystal oscillator vibration compensation circuit |
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