CN111082751A - 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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Abstract
The invention is suitable for the technical field of crystal oscillators, and provides a frequency compensation system of a crystal oscillator with amplitude phase compensation, which comprises: the device comprises 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 is carried out on the acceleration voltage signal through the acceleration compensation circuit, the acceleration compensation voltage is obtained, finally, the amplitude and the phase compensation are carried out on the acceleration compensation voltage through the phase amplitude compensation circuit, the final compensation voltage is obtained, the amplitude and the phase deviation of the voltage signal of the acceleration sensor when the vibration intensity of the crystal oscillator is monitored can be reduced through the final compensation voltage, the frequency change of the crystal oscillator is reduced, the frequency compensation range of the crystal oscillator is expanded, 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 with amplitude phase compensation.
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. The disadvantage is that the mechanical vibration damping mode has the problem of the resonance frequency of the vibration damper, the vibration damping mode has the damping effect on the vibration which is greater than the resonance frequency, the vibration damping mode has no damping effect on the vibration which is less than or equal to the resonance frequency, and the vibration damping mode can even generate resonance at the resonance frequency to amplify the vibration strength.
Disclosure of Invention
In view of this, embodiments of the present invention provide a frequency compensation system of a crystal oscillator with amplitude and phase compensation, so as to solve the problem that the mechanical damping manner in the prior art cannot optimize the near-end dynamic phase noise of the low frequency band.
The embodiment of the invention provides a frequency compensation system of a crystal oscillator with amplitude phase compensation, which comprises: the device comprises 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 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 performing 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 deviation according to the final compensation voltage.
In one embodiment, 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 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 an acceleration compensation voltage according to the initial compensation voltage and the level control signal.
In one embodiment, 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 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 positive phase output unit, the second stationary contact of the conversion type relay is connected with the input end of the negative phase output unit, and the output end of the positive phase output unit and the output end of the negative 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 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 the inverting output unit obtains the second compensation voltage according to the initial compensation voltage.
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, output the high level signal if the noise difference is smaller than a noise difference threshold, and output the low level signal if the noise difference 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 non-inverting output unit includes a first output resistor.
In one embodiment, the inverting output unit includes an inverter.
In one embodiment, the amplitude phase 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 positive phase input end of the first operational amplifier is the input end of the amplitude phase 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 negative phase 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 both grounded, the second end of the second compensation capacitor and the second end of the second compensation resistor are both 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 amplitude phase 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 invention has the following beneficial effects: the frequency compensation system of the crystal oscillator with amplitude and phase compensation provided by the embodiment of the invention detects the acceleration of the crystal oscillator through the acceleration sensor, then performs acceleration compensation through the acceleration compensation circuit to obtain the acceleration compensation voltage, and finally performs amplitude and phase compensation on the acceleration compensation voltage through the phase amplitude compensation circuit to obtain the final compensation voltage, so that the final compensation voltage can reduce the 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 change 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 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 diagram of a frequency compensation system of a crystal oscillator with amplitude phase compensation 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 diagram of another structure of a frequency compensation system of a crystal oscillator with amplitude phase compensation according to an embodiment of the present invention
FIG. 4 is a circuit schematic diagram of an acceleration compensation circuit and an amplitude phase compensation circuit provided by an embodiment of the present invention;
fig. 5 is a comparison graph of phase noise variation curves before and after amplitude phase compensation 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 with amplitude phase compensation according to an embodiment of the present invention, 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 the crystal oscillator;
the acceleration sensor 11 is configured to detect an acceleration of the crystal oscillator to 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 frequency offset according to the final 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. An output terminal 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 to provide an acceleration 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 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 graph before and after the crystal oscillator 20 is subjected to frequency compensation, where a curve a is a frequency variation graph of the crystal oscillator before acceleration compensation, a curve b is a frequency variation graph of the crystal oscillator after acceleration compensation, and a curve c is a frequency variation graph corresponding to an acceleration 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 acceleration 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.
In this embodiment, since the acceleration sensor 11 has a fixed resonant frequency, usually within 1500Hz, and is affected by the resonant frequency of the acceleration sensor 11, the acceleration sensor 11 is used to monitor the amplitude and phase deviation of the voltage signal of the vibration intensity applied to the crystal oscillator, the frequency compensation range can only reach about 100Hz, and the frequency compensation effect is not good.
In view of this, in the present embodiment, the amplitude phase compensation circuit compensates the phase and the amplitude of the acceleration compensation voltage compensated by the acceleration compensation circuit 12, so as to compensate for the influence of the resonant frequency of the acceleration sensor 11, thereby expanding the frequency compensation range and optimizing the frequency compensation effect.
Fig. 3 is a schematic structural diagram of a frequency compensation system of a crystal oscillator with amplitude and phase compensation provided by this 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 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 applied to 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 comprises a first compensation voltage and a second compensation voltage; the direction compensation module 122 includes a conversion-type relay, a normal phase output unit and an inverse phase output unit;
a moving contact of the conversion-type relay is connected with an output end of the initial compensation module 121, a first stationary contact of the conversion-type relay is connected with an input end of the positive phase output unit, a second stationary contact of the conversion-type relay is connected with an input end of the negative phase output unit, and an output end of the positive phase output unit and an output end of the negative phase output unit are respectively connected with an 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 conversion relay is used for converting the switching 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 123;
the normal phase output unit obtains the first compensation voltage according to the initial compensation voltage;
and 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 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 acceleration 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 122 used in the previous 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 acceleration compensation voltage outputted by the frequency compensation system is applied to the crystal oscillator 20 is the same as the frequency change direction before the crystal oscillator 20 is not compensated, and at this time, the output unit in the direction compensation module 122 needs to be changed, for example, if the initial compensation module 121 in the previous period is connected to the positive phase output unit, the initial compensation module 121 is connected to the negative phase output unit through the switching relay K1, and the initial compensation module 121 is disconnected from the positive phase 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 121 and the direction compensation module 122, the conversion-type relay K1 includes three contacts, one of which is a movable contact and two of which are fixed contacts, the movable contact is connected with the output end of the initial compensation module 121, the first fixed contact is connected with the normal phase output unit, 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 121 is connected to the non-inverting output unit through a normally closed switch, and the initial compensation module 121 is connected to the inverting output unit through a normally open switch of a switching 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 121 is sent to the normal phase output unit, and the normal phase output unit outputs the initial compensation voltage to the amplitude phase compensation circuit in a normal phase. When the conversion type relay K1 acquires a high level signal, the moving contact is converted 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 121 is sent to the inverting output unit, the inverting output unit inverts the initial compensation voltage, the obtained acceleration compensation voltage is sent to the amplitude phase compensation circuit.
In an embodiment of the present invention, the first stationary contact may also be 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 positive phase output unit, so that the initial compensation module 121 is connected to the positive phase output unit through the 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 without frequency compensation and a second phase noise of the crystal oscillator 20 after the frequency compensation 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, output the high level signal if the noise difference is smaller than a noise difference threshold, and output the low level signal if the noise difference 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, where 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 by the crystal oscillator after the frequency compensation is performed on 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 sent to a control unit 1232. The control unit 1232 obtains a noise difference value according to the first phase noise and the second phase noise, if the noise difference value is smaller than the noise difference threshold, it indicates that the phase noise of the crystal oscillator 20 has not changed significantly, and it is necessary to change the output unit of the direction compensation module 122, so that a high level is output to change the switching state of the transfer relay K1, and if the noise difference value is greater than or equal to the noise difference threshold, it indicates that the phase noise of the crystal oscillator 20 has decreased significantly, and the compensation direction of the current output unit is correct, so a low level signal is output, and the transfer 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 121 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, and the output end of the first amplification unit is connected with the input end of the addition unit;
the input end of the second amplification unit is connected with the Y-axis output end of the three-axis acceleration sensor, and the output end of the second amplification unit is connected with the input end of the addition unit;
the input end of the third amplification unit is connected with the Z-axis output end of the three-axis acceleration sensor, and the output end of the third amplification unit is connected with the input end of the addition unit.
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, fig. 4 shows a circuit schematic diagram of the acceleration compensation circuit 12 and the amplitude phase compensation circuit in the frequency compensation system of the crystal oscillator with amplitude phase compensation, as shown in fig. 4, and X, Y, Z ports in fig. 4 are respectively an X-axis output terminal, a Y-axis output terminal and a Z-axis output terminal of the acceleration sensor 11.
In the present 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 OP 1;
a first end of the first amplifying resistor R1 is an input end of the first amplifying unit, and a second end of the first amplifying resistor R1 is connected to a non-inverting input end of the second operational amplifier OP 1; an inverting input terminal of the second 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 second 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 this embodiment, the second and third amplification units have the same structure as the first amplification 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 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 fourth 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 third operational amplifier OP 2; an inverting input terminal of the third 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 third 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 fourth operational amplifier OP 3; an inverting input terminal of the fourth 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 fourth 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 fifth operational amplifier OP 4;
a non-inverting input terminal of the fifth operational amplifier OP4 is an input terminal of the adding unit, and a non-inverting input terminal of the fifth operational amplifier OP4 is grounded through the first adding resistor R13; an inverting input terminal of the fifth 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 fifth operational amplifier OP4, and an output terminal of the fifth 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 the present embodiment, the inverter includes a second output resistor R17, a third output resistor R18, and a sixth 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 sixth operational amplifier OP5 and a first end of the third output resistor R18, a non-inverting input end of the sixth operational amplifier OP5 is grounded, a second end of the third output resistor R18 is connected to an output end of the sixth operational amplifier OP5, and an output end of the sixth operational amplifier OP5 is an output end of the inverter.
In one embodiment, the amplitude phase compensation circuit comprises 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 OP 6;
a non-inverting input terminal of the first operational amplifier OP6 is an input terminal of the amplitude phase compensation circuit, a second terminal of the first compensation resistor R19, a second terminal of the first compensation capacitor C1, a first terminal of the second compensation resistor R20, and a first terminal of the second compensation capacitor C2 are respectively connected to an inverting input terminal of the first operational amplifier OP6, a first terminal of the first compensation resistor R19 and a first terminal of the first compensation capacitor C1 are both grounded, a second terminal of the second compensation capacitor C2 and a second terminal of the second compensation resistor R20 are both connected to an output terminal of the first operational amplifier OP6, and an output terminal of the first operational amplifier OP6 is an output terminal of the amplitude phase 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 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 to implement the amplitude and phase compensation of the acceleration compensation voltage.
In this embodiment, as shown in fig. 5, fig. 5 is a comparison graph of phase noise change curves before and after amplitude phase compensation. In fig. 5, the abscissa is frequency, the ordinate is 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 amplitude and phase compensation is wider, and under the same frequency, the noise difference corresponding to the final compensation voltage is larger, that is, the frequency compensation effect after amplitude and phase compensation is better.
In one embodiment, the system further includes a first resistor Ro, a first terminal of the first resistor Ro is connected to the output terminal of the amplitude phase compensation circuit, and a second terminal 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 application provides a frequency compensation system adopts frequency voltage-controlled mode to carry out frequency voltage control to crystal oscillator 20, frequency variation when can reducing crystal oscillator 20 vibration, carries out amplitude and phase compensation to acceleration voltage through amplitude phase compensation module simultaneously to reduce acceleration sensor 11's resonant frequency to the influence of frequency compensation scope, enlarge frequency compensation scope, optimize the frequency compensation effect, finally realize the purpose of optimizing crystal oscillator 20 dynamic phase noise.
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 with amplitude phase compensation, comprising: the device comprises 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 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 performing 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 deviation according to the final compensation voltage.
2. The frequency compensation system of a crystal oscillator with amplitude phase compensation of claim 1, wherein 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 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 an acceleration compensation voltage according to the initial compensation voltage and the level control signal.
3. The frequency compensation system for a crystal oscillator with amplitude phase compensation of claim 2, 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 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 positive phase output unit, the second stationary contact of the conversion type relay is connected with the input end of the negative phase output unit, and the output end of the positive phase output unit and the output end of the negative 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 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 the inverting output unit obtains the second compensation voltage according to the initial compensation voltage.
4. The frequency compensation system for a crystal oscillator with amplitude phase compensation of claim 2, wherein the level control signal comprises a high level signal and a low level signal, 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, output the high level signal if the noise difference is smaller than a noise difference threshold, and output the low level signal if the noise difference is greater than or equal to the noise difference threshold.
5. The frequency compensation system for a crystal oscillator with amplitude phase compensation of claim 2, wherein the acceleration sensor is a three-axis acceleration sensor.
6. The frequency compensation system for a crystal oscillator with amplitude phase compensation of claim 5, 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.
7. The frequency compensation system of claim 3, wherein the non-inverting output unit comprises a first output resistor.
8. A frequency compensation system for a crystal oscillator with amplitude phase compensation as set out in claim 3, wherein said inverting output unit comprises an inverter.
9. The frequency compensation system of a crystal oscillator with amplitude phase compensation of any one of claims 1 to 8, wherein the amplitude phase 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 positive phase input end of the first operational amplifier is the input end of the amplitude phase 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 negative phase 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 both grounded, the second end of the second compensation capacitor and the second end of the second compensation resistor are both 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 amplitude phase compensation circuit.
10. A frequency compensation system for a crystal oscillator with amplitude phase compensation as claimed in any one of claims 1 to 8, further comprising a first resistor, a first terminal of said first resistor being connected to an output of said phase amplitude compensation circuit and a second terminal of said first resistor being connected to an input of said crystal oscillator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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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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