CN102970032A - Method for automatically calibrating digital frequency - Google Patents
Method for automatically calibrating digital frequency Download PDFInfo
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- CN102970032A CN102970032A CN2012104886402A CN201210488640A CN102970032A CN 102970032 A CN102970032 A CN 102970032A CN 2012104886402 A CN2012104886402 A CN 2012104886402A CN 201210488640 A CN201210488640 A CN 201210488640A CN 102970032 A CN102970032 A CN 102970032A
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Abstract
The invention discloses a method for automatically calibrating digital frequency. According to the method, a reference frequency Fs, a phase discriminator F, a phase discrimination output signal Vo, a voltage-controlled oscillator and a voltage-controlled output signal Fout are utilized. According to the method, the digital frequency can be automatically calibrated, the calibration is accurate and the reliability is high.
Description
Technical field
The invention belongs to mechanical oscillation frequency measurement field, particularly a kind of automatic digital transmitting frequency calibration method.
Background technology
In mechanical oscillation frequency measurement field, because the impact of the factors such as the mechanical oscillation frequency spectrum is wide, in time dynamic change of standard frequency, its sensor measurement signal tends to the occurrence frequency skew, thereby need to carry out frequency offset correction, thereby improves the performance of sensor measurement.
Summary of the invention
Order of the present invention is to provide a kind of automatic digital transmitting frequency calibration method.
The technical scheme that realizes above-mentioned purpose is: a kind of automatic digital transmitting frequency calibration method, comprise reference frequency Fs, phase discriminator F, phase demodulation output signal Vo, voltage controlled oscillator and voltage-controlled output frequency Fout, wherein:
Described reference frequency Fs be connected voltage-controlled output signal Fout and connect the input of described phase discriminator F, described phase demodulation output signal Vo connects described voltage controlled oscillator input, described voltage controlled oscillator is exported voltage-controlled output frequency Fout.
Above-mentioned a kind of automatic digital transmitting frequency calibration method, wherein, described phase discriminator F is the phase discriminator of XOR, described phase demodulation output signal Vo=Fs-Fout is pulse signal.
Above-mentioned a kind of automatic digital transmitting frequency calibration method, wherein, the described voltage-controlled output frequency Fout=Vo of described voltage controlled oscillator * K=(Fs-Fout) * K can get Fout=K * Fs/ (1+K), and K is much larger than 1 o'clock, Fout=Fs.
The invention has the beneficial effects as follows: the present invention can carry out automatic calibration to numerical frequency, has the advantages that calibration is accurate, reliability is high.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
See also Fig. 1, provided a kind of automatic digital transmitting frequency calibration method among the figure, comprise reference frequency Fs, phase discriminator F, phase demodulation output signal Vo, voltage controlled oscillator and voltage-controlled output frequency Fout, wherein:
Reference frequency Fs be connected voltage-controlled output signal Fout and connect the input of phase discriminator F, phase demodulation output signal Vo connects the voltage controlled oscillator input, voltage controlled oscillator is exported voltage-controlled output frequency Fout.
Phase discriminator F is the phase discriminator of XOR, and described phase demodulation output signal Vo=Fs-Fout is pulse signal, and the voltage-controlled output frequency Fout=Vo of voltage controlled oscillator * K=(Fs-Fout) * K can get Fout=K * Fs/ (1+K), and K is much larger than 1 o'clock, Fout=Fs.
This law Benq present principles is: utilize principle of phase lock loop, the phase detecting method compensating error.
Below embodiment has been described in detail the present invention by reference to the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not consist of limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (3)
1. an automatic digital transmitting frequency calibration method is characterized in that, comprises reference frequency Fs, phase discriminator F, phase demodulation output signal Vo, voltage controlled oscillator and voltage-controlled output frequency Fout, wherein:
Described reference frequency Fs be connected voltage-controlled output signal Fout and connect the input of described phase discriminator F, described phase demodulation output signal Vo connects described voltage controlled oscillator input, described voltage controlled oscillator is exported voltage-controlled output frequency Fout.
2. a kind of automatic digital transmitting frequency calibration method according to claim 1 is characterized in that, described phase discriminator F is the phase discriminator of XOR, and described phase demodulation output signal Vo=Fs-Fout is pulse signal.
3. a kind of automatic digital transmitting frequency calibration method according to claim 1, it is characterized in that, the described voltage-controlled output frequency Fout=Vo of described voltage controlled oscillator * K=(Fs-Fout) * and K, can get Fout=K * Fs/ (1+K), K is much larger than 1 o'clock, Fout=Fs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104886402A CN102970032A (en) | 2012-11-26 | 2012-11-26 | Method for automatically calibrating digital frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104886402A CN102970032A (en) | 2012-11-26 | 2012-11-26 | Method for automatically calibrating digital frequency |
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| CN102970032A true CN102970032A (en) | 2013-03-13 |
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| CN2012104886402A Pending CN102970032A (en) | 2012-11-26 | 2012-11-26 | Method for automatically calibrating digital frequency |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235293A (en) * | 2013-03-25 | 2013-08-07 | 深圳市华儒科技有限公司 | Method and device for frequency correction |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557229A (en) * | 2008-04-10 | 2009-10-14 | 中芯国际集成电路制造(上海)有限公司 | System and method for self-calibration of phase-locked loop |
| CN101783677A (en) * | 2010-03-26 | 2010-07-21 | 海能达通信股份有限公司 | Locking method of phase-locked loop and locking circuit thereof |
| CN101834598A (en) * | 2010-05-14 | 2010-09-15 | 无锡辐导微电子有限公司 | Frequency correction circuit and frequency correction method thereof |
-
2012
- 2012-11-26 CN CN2012104886402A patent/CN102970032A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557229A (en) * | 2008-04-10 | 2009-10-14 | 中芯国际集成电路制造(上海)有限公司 | System and method for self-calibration of phase-locked loop |
| CN101783677A (en) * | 2010-03-26 | 2010-07-21 | 海能达通信股份有限公司 | Locking method of phase-locked loop and locking circuit thereof |
| CN101834598A (en) * | 2010-05-14 | 2010-09-15 | 无锡辐导微电子有限公司 | Frequency correction circuit and frequency correction method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235293A (en) * | 2013-03-25 | 2013-08-07 | 深圳市华儒科技有限公司 | Method and device for frequency correction |
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Application publication date: 20130313 |