CN111130538A - Frequency calibration system and frequency instrument - Google Patents
Frequency calibration system and frequency instrument Download PDFInfo
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- H—ELECTRICITY
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- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
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Abstract
The embodiment of the invention discloses a frequency calibration system and a frequency instrument, wherein the frequency calibration system comprises a Beidou time service module, a signal processing module, a phase-locked loop and a microcontroller; the Beidou time service module receives a reference clock signal of a Beidou satellite and outputs a time service clock signal to the signal processing module; the phase-locked loop receives the clock frequency signal to be detected output by the frequency generation module and outputs a frequency-locked clock signal of the clock frequency signal to be detected to the signal processing module; the signal processing module compares the time service clock signal with the frequency locking clock signal and outputs a clock difference to the microcontroller; when the clock difference exceeds a preset clock difference range, the microcontroller outputs a first calibration signal so that the frequency generation module outputs a calibrated clock frequency signal to be detected; or when the clock difference is within a preset clock difference range, outputting a second calibration signal so that the frequency generation module outputs a calibration clock frequency signal.
Description
Technical Field
The embodiment of the invention relates to the field of frequency measurement, in particular to a frequency calibration system and a frequency instrument.
Background
Frequency measurement is often used in the field of electronic design and measurement, and therefore the study of frequency measurement methods is of great significance in practical engineering applications. At present, the frequency is measured by instruments such as a frequency meter, but each instrument cannot be accurately measured by the frequency meter, which causes the increase of the test cost; in addition, the accuracy of the output frequency of the instrument is directly judged according to the test output of the instrument, and the instrument needs to be calibrated regularly. Generally, the accuracy affecting the output frequency of the instrument is mainly an on-board crystal oscillator and a temperature compensation crystal oscillator, the accuracy of the crystal oscillator is 0.1ppm, and the requirements of most equipment are met, and in some cases, when the instrument is calibrated, the instrument needs to go to a professional calibration mechanism or a qualified manufacturer for calibration, so that the calibration process of the frequency is complicated, and the calibration accuracy is not high.
Disclosure of Invention
The embodiment of the invention provides a frequency calibration system and a frequency instrument, which are used for reliably acquiring high-precision clock frequency at low cost.
In a first aspect, an embodiment of the present invention provides a frequency calibration system, where the frequency calibration system includes: the Beidou time service module, the signal processing module, the phase-locked loop and the microcontroller are arranged;
the Beidou time service module is used for receiving a reference clock signal of a Beidou satellite and outputting a time service clock signal to the signal processing module;
the phase-locked loop is used for receiving a clock frequency signal to be detected output by the frequency generation module and outputting a frequency-locked clock signal of the clock frequency signal to be detected to the signal processing module;
the signal processing module is used for comparing the time service clock signal with the frequency locking clock signal and outputting the clock difference between the time service clock signal and the frequency locking clock signal to the microcontroller;
the microcontroller is used for outputting a first calibration signal when the clock difference exceeds a preset clock difference range, so that the frequency generation module outputs a calibrated clock frequency signal to be detected; or when the clock difference is within a preset clock difference range, outputting a second calibration signal so that the frequency generation module outputs a calibration clock frequency signal.
Optionally, the signal processing module includes a programmable logic controller and/or a phase detector.
Optionally, the method further includes: a first analog-to-digital converter;
the microcontroller is also used for sending a control signal for signal acquisition to the first analog-to-digital converter;
the first analog-to-digital converter is used for acquiring the first calibration signal or the second calibration signal generated by the micro-control according to the control signal acquired by the signal, converting the first calibration signal or the second calibration signal into a digital calibration signal and outputting the digital calibration signal to the frequency generation module so as to calibrate the clock frequency of the frequency generation module.
Optionally, the microcontroller comprises a bus interface;
the control signal sent by the microcontroller is output through the bus interface, and the first analog-to-digital converter acquires the calibration signal through the bus interface.
Optionally, the method further includes: a frequency division module;
the frequency division module is arranged between the phase-locked loop and the signal processing module; the frequency division module is used for dividing the frequency of the frequency-locked clock signal output by the phase-locked loop and outputting the frequency-locked clock signal with the same frequency as the time service clock signal to the signal processing module.
Optionally, the frequency dividing module is further configured to compare the frequency-divided frequency-locked clock signal with the time service clock signal frequency signal, and store the comparison result in a table.
In a second aspect, an embodiment of the present invention provides a frequency meter, which includes a frequency generation module and the frequency calibration system described in the first aspect.
Optionally, the method further includes: a frequency output module;
the frequency calibration system further comprises a frequency division module;
the microcontroller is also used for outputting a control signal of signal output to the frequency output module when the clock difference is within a preset clock difference range;
the phase-locked loop is also used for receiving the calibration clock frequency signal output by the frequency generation module, and outputting the calibration clock frequency signal to the frequency division module after frequency locking;
the frequency division module is also used for carrying out frequency division on the calibration clock signal after frequency locking and outputting a calibration clock frequency signal with preset frequency;
the frequency output module is respectively connected with the microcontroller of the frequency calibration system and the frequency division module; and the frequency output module is used for outputting the calibration clock frequency signal with the preset frequency when receiving the control signal output by the signal.
Optionally, the frequency output module includes a second analog-to-digital converter, an attenuator, and a mixing filter;
the second analog-to-digital converter is used for converting the analog signal of the calibration clock frequency signal with the preset frequency into a digital signal and outputting the digital signal to the attenuator;
the attenuator is used for performing power attenuation on the digital signal of the calibration clock frequency signal with the preset frequency and outputting the digital signal to the mixing filter;
and the mixing filter is used for filtering the attenuated digital signal of the calibration clock frequency signal with the preset frequency.
Optionally, the frequency generation module includes a crystal oscillator.
According to the technical scheme of the embodiment, a Beidou time service module receives a reference clock signal of a Beidou satellite and outputs a time service clock signal to a signal processing module; the phase-locked loop receives the clock frequency signal to be detected output by the frequency generation module and outputs a frequency-locked clock signal of the clock frequency signal to be detected to the signal processing module; the signal processing module compares the time service clock signal with the frequency locking clock signal and outputs a clock difference to the microcontroller; when the clock difference exceeds a preset clock difference range, the microcontroller outputs a first calibration signal so that the frequency generation module outputs a calibrated clock frequency signal to be detected; or when the clock difference is within a preset clock difference range, outputting a second calibration signal so that the frequency generation module outputs a calibration clock frequency signal. The problems that in the prior art, the output frequency precision of a frequency instrument is low, the calibration process is complex and the calibration precision is low and the like when the frequency instrument is calibrated are solved, low-cost and reliable clock frequency calibration is realized, and the acquisition of high-precision clock frequency is also realized.
Drawings
Fig. 1 is a block diagram of a frequency calibration system according to an embodiment of the present invention;
fig. 2 is a block diagram of another frequency calibration system according to an embodiment of the present invention;
fig. 3 is a block diagram of a frequency meter according to an embodiment of the present invention;
fig. 4 is a block diagram of another frequency meter according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a structural block diagram of a frequency calibration system according to an embodiment of the present invention, and as shown in fig. 1, the frequency calibration system 100 includes a big dipper time service module 10, a signal processing module 20, a phase-locked loop 30, and a microcontroller 40. The Beidou time service module 10 is used for receiving a reference clock signal of the Beidou satellite and outputting a time service clock signal to the signal processing module 20. The phase-locked loop 30 is configured to receive the clock frequency signal to be tested output by the frequency generating module 70, and output a frequency-locked clock signal of the clock frequency signal to be tested to the signal processing module 20.
The signal processing module 20 is configured to compare the time service clock signal and the frequency-locked clock signal, and output a clock difference between the time service clock signal and the frequency-locked clock signal to the microcontroller 40. The microcontroller 40 is configured to output a first calibration signal when the clock difference exceeds a preset clock difference range, so that the frequency generation module 70 outputs a calibrated clock frequency signal to be measured; or when the clock difference is within the preset clock difference range, outputting the second calibration signal, so that the frequency generation module 70 outputs the calibration clock frequency signal.
The frequency generation module 70 may be a crystal oscillator, which generates a stable clock frequency signal. Under normal operating conditions, the absolute accuracy of a common crystal oscillator frequency can reach fifty parts per million, while some higher-order crystal oscillators have higher accuracy. When the clock frequency output accuracy of the frequency generation module 70 is low, the clock frequency of the frequency generation module 70 needs to be calibrated. Generally, the crystal oscillator can adjust the frequency within a certain range by an applied voltage.
The frequency calibration system 100 provided by the embodiment of the invention receives and outputs a time service clock signal as a reference clock signal through the Beidou time service module 10, and the phase-locked loop 30 receives a clock frequency signal of the frequency generation module 70, performs phase adjustment on the clock frequency signal of the frequency generation module 70, and outputs a frequency-locked clock frequency signal; the signal processing module 20 then compares the reference clock signal and the frequency-locked clock signal and outputs the clock difference of the reference clock signal and the frequency-locked clock signal to the microcontroller 40. When the clock difference is greater than the first preset difference value, the microcontroller 40 generates a first calibration signal of the frequency signal to be measured, and the frequency generation module 70 is controlled to output the clock frequency after the first calibration, for example, the microcontroller 40 controls the crystal oscillator to change the voltage and adjust the crystal oscillator to output the clock frequency after the first calibration; after the first calibrated clock frequency signal is subjected to frequency locking and frequency division again, the signal processing module 20 compares the reference clock signal with the first calibrated clock frequency again, and when the microcontroller 40 receives that the clock difference still exceeds the first preset difference value, the microcontroller 40 adjusts the frequency generation module 70 again to output the calibrated clock frequency; until the micro-controller 40 receives that the clock difference is within the first preset difference value, it outputs a second calibration signal to make the frequency generation module 70 output a calibration clock frequency signal. Therefore, the clock frequency signal of the frequency generation module 70 is synchronized with the time service clock frequency signal in a gradual iteration mode, so that the error is reduced, and high-precision frequency output is realized. It should be noted that, when the clock difference received by the microcontroller 40 for the first time is within the first preset range, the first calibration signal and the second calibration signal output by the microcontroller 40 are the same control signal, and the control frequency generation module 70 outputs the calibration clock frequency signal.
According to the embodiment, through the time service function of the Beidou satellite, the problems of high calibration cost, complex calibration process, low calibration frequency precision and the like when the frequency instrument to be detected with low output frequency precision is calibrated are solved, and the low-cost and reliable acquisition of high-precision clock frequency is realized.
Optionally, with continued reference to fig. 1, the signal processing module 20 includes a programmable logic controller and/or a phase detector.
Specifically, when the signal processing module 20 includes a programmable logic controller (FPGA), the logic unit in the FPGA can compare the reference clock signal with the frequency-locked clock signal and output the clock difference between the reference clock signal and the frequency-locked clock signal to the microprocessor 40; when the signal processing module 20 includes a phase detector, the phase detector can identify a phase difference between signals input thereto, and output a signal corresponding to the phase difference, and at this time, the signal output by the phase detector can output a clock difference between the reference clock signal and the frequency-locked clock signal to the microcontroller 40 through other devices; when the signal processing module 20 includes a programmable logic controller and a phase detector, the phase detector can recognize a phase difference between the reference clock signal and the frequency-locked clock signal and output an electrical signal corresponding to the phase difference, and the programmable logic controller can convert the electrical signal output by the phase detector into a clock difference between the reference clock signal and the frequency-locked clock signal and output the clock difference to the microcontroller 40.
Optionally, on the basis of the foregoing embodiment, further optimization is performed, and fig. 2 is a block diagram of another frequency calibration system provided in the embodiment of the present invention, and as shown in fig. 2, the frequency calibration system 100 further includes a first analog-to-digital converter 50.
The microcontroller 40 is further configured to send a control signal for signal acquisition to the first analog-to-digital converter 50; the first analog-to-digital converter 50 is configured to acquire the first calibration signal or the second calibration signal generated by the microcontroller 40 according to the control signal acquired by the signal, and convert the first calibration signal or the second calibration signal into a digital calibration signal to be output to the frequency generation module 70, so as to calibrate the clock frequency of the frequency generation module 70.
The frequency generation module 70 is capable of receiving the digital signal and outputting a corresponding clock frequency signal according to the received digital signal. A first analog-to-digital converter 50 is added between the microcontroller 40 and the frequency generation module 70 so that the microcontroller 40 outputs a calibration signal that is converted into a corresponding digital calibration signal to ensure that the signal input to the frequency generation module 70 is a digital signal. In this way, the frequency generation module 70 can generate the corresponding clock frequency signal from the digital calibration signal output by the first analog-to-digital converter 50, so that the accuracy of the generated clock frequency signal can be improved. The first analog-to-digital converter 50 may be a high-speed analog-to-digital converter to realize high-speed conversion of signals and output a high-precision calibration signal.
Optionally, with continued reference to fig. 2, the microcontroller 40 includes a bus interface; the control signal from the microcontroller 40 is output via the bus interface and the first analog-to-digital converter 50 collects the calibration signal via the bus interface.
The microcontroller 40 communicates with the first analog-to-digital converter through a bus interface, and the purpose of simplifying the circuit can be achieved in the circuit design.
Optionally, with continued reference to fig. 2, the frequency calibration system 100 further comprises: a frequency division module 60; the frequency dividing module 60 is disposed between the phase-locked loop 30 and the signal processing module 20; the frequency dividing module 60 is configured to divide the frequency of the frequency-locked clock signal output by the phase-locked loop 30, and output the frequency-locked clock signal having the same frequency as the time service clock signal to the signal processing module 20.
For example, the frequency output by the frequency generation module 70 is 50MHz, the reference frequency output by the beidou time service module 10 is a clock with 32MHz, and the frequency-locked clock frequency signal is divided by the frequency division module 60 to obtain a clock signal with 32MHz and the same frequency as the reference clock signal.
Optionally, with reference to fig. 2, the frequency dividing module 60 is further configured to compare the frequency-divided frequency-locked clock signal with the frequency signal of the time service clock signal, and store the comparison result in a table.
The frequency division module 60 stores the clock difference between the frequency-locked clock signal and the frequency signal of the time service clock signal into a table, so as to be separated from the calibration source after the clock is calibrated, and then directly and rapidly look up the table to obtain the control voltage of the frequency generation module 70 for rapidly controlling the precise frequency output. In addition, if the calibration system is powered off, the data of the calibrated frequency signal is likely to be lost, so that the precise frequency output needs to be controlled by a table look-up combination algorithm.
According to the technical scheme, on the basis of the embodiment, the first analog-to-digital converter 50 is used for acquiring the calibration signal, the calibration signal is converted into the digital calibration signal and is output to the frequency generation module 70, so that the clock frequency of the frequency generation module 70 is calibrated, high-precision, low-cost and high-precision clock calibration of the frequency generation module 70 by using the simple Beidou time service satellite module 10 is realized, and the sampling of high-speed analog-to-digital signals and high-precision frequency signals is also realized.
The embodiment of the present invention further provides a frequency meter, where the frequency meter includes a frequency generation module 70 and the frequency calibration system 100 provided in the embodiment of the present invention, and therefore the frequency meter also has the beneficial effects of the frequency calibration system 100 provided in the embodiment of the present invention, and the same points can refer to the description of the frequency calibration system 100 described above, and are not repeated herein.
In addition, the frequency meter is provided with the frequency calibration system 100, the frequency generation module 70 of the frequency meter can generate the frequency of the calibration frequency clock signal, and an external calibration instrument is not needed to calibrate the frequency clock signal, so that the self-calibration effect of the frequency meter is realized.
Optionally, fig. 3 is a block diagram of a frequency meter according to an embodiment of the present invention, and as shown in fig. 3, the frequency meter includes a frequency generation module 70, a frequency output module 80, and a frequency calibration system 100; the frequency calibration system 100 comprises a Beidou time service module 10, a signal processing module 20, a phase-locked loop 30 and a microcontroller 40; the microcontroller 40 of the frequency calibration system 100 is further configured to output a control signal of the signal output to the frequency output module 80 when the clock difference is within the preset clock difference range; the phase-locked loop 30 of the frequency calibration system 100 is further configured to receive the calibration clock frequency signal output by the frequency generation module 70, and output the calibration clock frequency signal to the frequency division module 60 after frequency locking; the frequency dividing module 60 of the frequency calibration system 100 is further configured to frequency-divide the frequency-locked calibration clock signal and output a calibration clock frequency signal with a preset frequency; the frequency output module 80 is respectively connected with the microcontroller 40 and the frequency dividing module 60 of the frequency calibration system 100; the frequency output module 80 is configured to output a calibration clock frequency signal with a preset frequency when receiving a control signal of the signal output.
Specifically, when the microcontroller 40 of the frequency calibration system 100 receives a clock difference within the preset clock difference range, the microcontroller 40 sends a control signal for outputting an output signal to the frequency generation module 70, the frequency generation module 70 outputs a calibration clock frequency signal, the calibration clock frequency signal outputs a calibration clock frequency signal of a preset frequency after the phase of the phase-locked loop 30 is adjusted and the frequency is divided by the frequency division module 60, and finally the frequency output module 80 outputs the calibration clock frequency signal of the preset frequency.
According to the technical scheme, the frequency instrument calibrates the frequency generation module through the time service function of the Beidou satellite in the frequency calibration system 100, so that low-cost and reliable clock calibration is realized; the output of high precision frequency is also realized by the frequency output module 80.
Optionally, fig. 4 is a block diagram of another frequency meter according to an embodiment of the present invention, and referring to fig. 4, the frequency output module 80 includes a second analog-to-digital converter 81, an attenuator 82, and a mixing filter 83. A second analog-to-digital converter 81, configured to convert an analog signal of the calibration clock frequency signal with the preset frequency into a digital signal, and output the digital signal to an attenuator 82; and an attenuator 82 for performing power attenuation on the digital signal of the calibration clock frequency signal of the preset frequency and outputting the digital signal to the mixing filter 83. And the mixing filter is used for filtering the attenuated digital signal of the calibration clock frequency signal with the preset frequency.
The second analog-to-digital converter 81 converts an analog signal of a calibration clock frequency signal with a preset frequency into a digital signal, so that a high-speed sampling function can be realized; the attenuator 82 in the frequency output module 80 performs power attenuation on the digital signal of the calibration clock frequency signal with the preset frequency to prevent the output power with the preset frequency from being overloaded; the mixer filter 83 may filter the attenuated digital signal of the calibration clock frequency, and may amplify the intermediate frequency with a high gain after mixing the digital signal to a fixed intermediate frequency.
The frequency meter according to the present invention includes the frequency calibration system 100 of the present embodiment, and therefore, has the same beneficial effects as the frequency calibration system 100 of the present embodiment, and achieves low cost, reliable acquisition of high-precision clock frequency, and also achieves high-speed simulation and sampling of high-precision frequency signals.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A frequency calibration system, comprising: the Beidou time service module, the signal processing module, the phase-locked loop and the microcontroller are arranged;
the Beidou time service module is used for receiving a reference clock signal of a Beidou satellite and outputting a time service clock signal to the signal processing module;
the phase-locked loop is used for receiving a clock frequency signal to be detected output by the frequency generation module and outputting a frequency-locked clock signal of the clock frequency signal to be detected to the signal processing module;
the signal processing module is used for comparing the time service clock signal with the frequency locking clock signal and outputting the clock difference between the time service clock signal and the frequency locking clock signal to the microcontroller;
the microcontroller is used for outputting a first calibration signal when the clock difference exceeds a preset clock difference range, so that the frequency generation module outputs a calibrated clock frequency signal to be detected; or when the clock difference is within a preset clock difference range, outputting a second calibration signal so that the frequency generation module outputs a calibration clock frequency signal.
2. The frequency calibration system of claim 1, wherein the signal processing module comprises a programmable logic controller and/or a phase detector.
3. The frequency calibration system of claim 1, further comprising: a first analog-to-digital converter;
the microcontroller is also used for sending a control signal for signal acquisition to the first analog-to-digital converter;
the first analog-to-digital converter is used for acquiring the first calibration signal or the second calibration signal generated by the micro-control according to the control signal acquired by the signal, converting the first calibration signal or the second calibration signal into a digital calibration signal and outputting the digital calibration signal to the frequency generation module so as to calibrate the clock frequency of the frequency generation module.
4. The frequency calibration system of claim 3, wherein the microcontroller comprises a bus interface;
the control signal sent by the microcontroller is output through the bus interface, and the first analog-to-digital converter acquires the calibration signal through the bus interface.
5. The frequency calibration system according to any one of claims 1 to 4, further comprising: a frequency division module;
the frequency division module is arranged between the phase-locked loop and the signal processing module; the frequency division module is used for dividing the frequency of the frequency-locked clock signal output by the phase-locked loop and outputting the frequency-locked clock signal with the same frequency as the time service clock signal to the signal processing module.
6. The frequency calibration system of claim 5, wherein the frequency division module is further configured to compare the frequency-divided frequency-locked clock signal with the time service clock signal frequency signal, and store the comparison result in a table.
7. A frequency meter, comprising: a frequency generation module and a frequency calibration system as claimed in any one of claims 1 to 6.
8. The frequency meter of claim 7, further comprising: a frequency output module;
the frequency calibration system further comprises a frequency division module;
the microcontroller is also used for outputting a control signal of signal output to the frequency output module when the clock difference is within a preset clock difference range;
the phase-locked loop is also used for receiving the calibration clock frequency signal output by the frequency generation module, and outputting the calibration clock frequency signal to the frequency division module after frequency locking;
the frequency division module is also used for carrying out frequency division on the calibration clock signal after frequency locking and outputting a calibration clock frequency signal with preset frequency;
the frequency output module is respectively connected with the microcontroller of the frequency calibration system and the frequency division module; and the frequency output module is used for outputting the calibration clock frequency signal with the preset frequency when receiving the control signal output by the signal.
9. The frequency meter of claim 8, wherein the frequency output module comprises a second analog-to-digital converter, an attenuator, a mixer filter;
the second analog-to-digital converter is used for converting the analog signal of the calibration clock frequency signal with the preset frequency into a digital signal and outputting the digital signal to the attenuator;
the attenuator is used for performing power attenuation on the digital signal of the calibration clock frequency signal with the preset frequency and outputting the digital signal to the mixing filter;
and the mixing filter is used for filtering the attenuated digital signal of the calibration clock frequency signal with the preset frequency.
10. The frequency meter according to any one of claims 7 to 9, wherein the frequency generation module comprises a crystal oscillator.
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Cited By (3)
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| US11411568B1 (en) * | 2021-08-31 | 2022-08-09 | Guangdong University Of Technology | Beidou signal tracking system with nonlinear phase-locked loop |
| CN115514428A (en) * | 2022-08-24 | 2022-12-23 | 广州润芯信息技术有限公司 | Frequency calibration system and method |
| CN116722872A (en) * | 2023-05-29 | 2023-09-08 | 深圳市航顺芯片技术研发有限公司 | Clock calibration device and method based on high-precision ADC |
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