CN202502168U - Phase noise measuring device - Google Patents
Phase noise measuring device Download PDFInfo
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- CN202502168U CN202502168U CN2012201076112U CN201220107611U CN202502168U CN 202502168 U CN202502168 U CN 202502168U CN 2012201076112 U CN2012201076112 U CN 2012201076112U CN 201220107611 U CN201220107611 U CN 201220107611U CN 202502168 U CN202502168 U CN 202502168U
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Abstract
The utility model discloses a phase noise measuring device. The device comprises a source signal preprocessing module and a FPGA chip, wherein an input end of the source signal preprocessing module is connected with an analog signal source to-be- measured, and the FPGA chip comprises a signal analyzer and a reference source signal generator. According to the phase noise measuring device of the utility model, a reference source signal can be realized through the FPGA, introduction of an external noise can be an avoided, thereby reducing background noise of the measuring device to a large degree. At the same time, requirements for a source to-be-measured in various aspects of noise, bandwidth and the like are reduced.
Description
Technical field
The utility model relates to electronic measuring technology field, is specifically related to a kind of phase noise measurement device.
Background technology
Raising along with electronic product performance requires also improves signal source and frequency source performance demands thereupon, payes attention to thereby phase noise receives widely.For example for a high performance nuclear magnetic resonance spectrometer, the phase noise in clock source is extremely important.But existing phase noise measurement method all needs a reference source, and this reference source phase noise level requirement is very high, otherwise can limit the phase noise measurement system, can't give full play to its effectiveness.Traditional phase noise detects has following several kinds of modes usually: a kind of is to adopt quadrature phase-detecting technology; The output signal in reference source and source to be measured is passed through pll lock under the quadrature in phase state; Convert phase signal into voltage signal by phase detector; Output to spectrum analyzer analysis through filtering and amplification, the shortcoming of this method is that the frequency range of measuring is limited, and reference source must be arranged.And the level of making an uproar mutually of reference source requires very high.Another kind is the PLL pattern of crosscorrelation, through power splitter the output in reference source and source to be measured is divided into two groups, outputs to two the good phase-detecting of consistance systems respectively; Then the output of two phase-detecting systems is done relevant treatment through FFT; Thereby eliminate uncorrelated noise, reduce the end of measuring system and make an uproar, the shortcoming of this method is need be through repeatedly sampling and doing relevant treatment; Eliminate uncorrelated noise, measurement mechanism is very huge.Also having a kind of common methods is that external reference source adds digital signal Processing; Respectively reference source and source to be measured are sampled through ADC; The signal that sampling is obtained carries out Digital Down Convert and phase-detecting; Differed subtracting each other through the two paths of signals of digital signal processing then, change the spectrogram of being made an uproar mutually carrying out DFT, the shortcoming of this method is to make an uproar at the end of bandwidth and the system in source to be measured to receive the restriction of AD.
The utility model content
The technical matters that the utility model mainly solves provides a kind of phase noise measurement device, makes the measurement that realizes phase noise under the situation of external reference source need not to introduce, and has solved the problem of the noise of introducing because of the analog references source.
In order to solve the problems of the technologies described above; The utility model adopts following technical scheme: a kind of phase noise measurement device; Comprise a source signal pre-processing module and a fpga chip; The input end of said source signal pre-processing module links to each other with simulation signal generator to be measured, comprises a signal analyzer and a reference source signal generator on the said fpga chip;
The output terminal of said source signal pre-processing module links to each other with reference source signal generator on the said fpga chip, the digital signal to be measured that is obtained by simulating signal pre-service to be measured to said reference source signal generator output;
Said reference source signal generator links to each other with said signal analyzer, exports the reference source signal that is converted to by said digital signal to be measured to said signal analyzer;
The input end of said signal analyzer links to each other with said reference source signal generator with said source signal pre-processing module respectively; The digital signal to be measured of said source signal pre-processing module output and the reference source signal of said reference source signal generator output are analyzed output phase noise measurement result.
Further improve, comprise in the said reference source signal generator: first wave filter, a gain amplification module, an integrator, an initial phase input source, a totalizer and a numerically-controlled oscillator;
Said first wave filter links to each other with said source signal pre-processing module, and the digital signal to be measured of said source signal pre-processing module output is carried out filtering, and said digital signal to be measured is limited to a pre-set frequency band and exports a frequency word;
Said gain amplification module links to each other with said first wave filter, adjusts the gain of the frequency word of said first wave filter output;
Said integrator links to each other with said gain amplification module, and the frequency word that said gain amplification module is exported converts the phase place word into;
The input end of said numerically-controlled oscillator links to each other through the output terminal of said totalizer with said initial phase input source and said integrator; Initial phase with said input is reference; Phase place word to said integrator output advances horizontal lock; Be locked on the said pre-set frequency band reference source signal after the output locking.
Further, comprise an automatic gain control module and an analog to digital converter in the said source signal pre-processing module; The input end of said automatic gain control module links to each other with said simulation signal generator to be measured, and output terminal links to each other with said analog to digital converter, and the output terminal of said analog to digital converter and said automatic gain control module constitute a feedback circuit.
Further, said signal analyzer comprises: a frequency mixer, second wave filter and one time domain-frequency domain modular converter;
The input end of said frequency mixer links to each other with said reference source signal generator with said source signal pre-processing module respectively, and the reference source signal of the digital signal to be measured of said source signal pre-processing module output, the output of said reference source signal generator is carried out convolution;
Said second wave filter links to each other with said frequency mixer, and the output result of said frequency mixer is carried out filtering;
Said time domain-frequency domain modular converter links to each other with said second wave filter, and the filtered of said second wave filter output is carried out time domain-frequency domain conversion, exports a phase noise measurement result.
The utility model is realized reference source signal through FPGA (Field-Programmable Gate Array, field programmable gate array), has avoided the introducing external noise, makes an uproar at the bottom of having reduced system to a great extent.Also source to be measured has been reduced simultaneously the requirement of each side such as noise, bandwidth, this device antijamming capability is strong, can not receive the external environment noise effect, therefore is specially adapted in the strong magnetic interference environment such as nuclear magnetic resonance.This system bulk is little, is easy to carry, and is beneficial to engineering and uses.
Description of drawings
Fig. 1 is the phase noise measurement structure drawing of device of the utility model one preferred embodiment;
Fig. 2 is the application example synoptic diagram of the utility model one preferred embodiments.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the embodiment of the utility model is done to describe in detail further below.
The embodiment of this programme is a kind of phase noise measurement device; Comprise a source signal pre-processing module and a fpga chip; The input end of said source signal pre-processing module links to each other with simulation signal generator to be measured, comprises a signal analyzer and a reference source signal generator on the said fpga chip.
Specifically referring to Fig. 1, the output terminal of said source signal pre-processing module links to each other with reference source signal generator on the said fpga chip, the digital signal to be measured that is obtained by simulating signal pre-service to be measured to said reference source signal generator output; The reference source signal generator links to each other with said signal analyzer, exports the reference source signal that is converted to by said digital signal to be measured to said signal analyzer; The input end of said signal analyzer links to each other with said reference source signal generator with said source signal pre-processing module respectively; The digital signal to be measured of said source signal pre-processing module output and the reference source signal of said reference source signal generator output are analyzed output phase noise measurement result.
Comprise in the reference source signal generator: first wave filter, a gain amplification module, an integrator, an initial phase input source, a totalizer and a numerically-controlled oscillator (NCO); First wave filter links to each other with said source signal pre-processing module, and the digital signal to be measured of said source signal pre-processing module output is carried out filtering, and said digital signal to be measured is limited to a pre-set frequency band and exports a frequency word; Said gain amplification module links to each other with said first wave filter, adjusts the gain of the frequency word of said first wave filter output; Said integrator links to each other with said gain amplification module, and the frequency word that said gain amplification module is exported converts the phase place word into; The input end of said numerically-controlled oscillator links to each other through the output terminal of said totalizer with said initial phase input source and said integrator; Initial phase with said input is reference; Phase place word to said integrator output advances horizontal lock; Be locked on the said pre-set frequency band reference source signal after the output locking.
Comprise an automatic gain control module (AGC) and an analog to digital converter (ADC) in the said source signal pre-processing module; The input end of said automatic gain control module links to each other with said simulation signal generator to be measured, and output terminal links to each other with said analog to digital converter, and the output terminal of said analog to digital converter and said automatic gain control module constitute a feedback circuit.
Said signal analyzer comprises: a frequency mixer, second wave filter and one time domain-frequency domain modular converter; The input end of said frequency mixer links to each other with said reference source signal generator with said source signal pre-processing module respectively, and the reference source signal of the digital signal to be measured of said source signal pre-processing module output, the output of said reference source signal generator is carried out convolution; Said second wave filter links to each other with said frequency mixer, and the output result of said frequency mixer is carried out filtering; Said time domain-frequency domain modular converter links to each other with said second wave filter, and the filtered of said second wave filter output is carried out time domain-frequency domain conversion, exports a phase noise measurement result.
In the preferred embodiment, first wave filter can be digital bandwidth adjustable filter (IIR), and second wave filter is finite impulse response filter (FIR).
Time domain-frequency domain modular converter specifically can be Fourier transform module, discrete Fourier transformation module (DFT) or Laplace transform module or the like, and preferable mode is fast Fourier transform module (FFT).
As shown in Figure 1; Signal bandwidth through the ADC sampling is very wide; After iir filter filtering with signal limiting at a certain frequency band and export a frequency word; Because NCO need import a phase place word with frequency lock,, the frequency word of IIR output exports to NCO so converting the phase place word into through an integrator.The input of external signal is a uncertain value for NCO, comes for referencial use so NCO need import an original frequency word.NCO is locked on this frequency after locking mutually through certain hour; After the locking lock indication signal is exported to slave computer; And the output of NCO and measured signal multiplied each other through frequency mixer, because two input signals are with frequently, difference frequency component is phase noise; Filtered out through the FIR wave filter with frequency component, conversion just can have been seen the phase noise result through FFT then.
Fig. 2 is an application example of the utility model, and the noise testing module described in the figure is the said device of the utility model.Mainly phase noise measurement is carried out in the clock source in the instrument through this module; Receive the output in clock source on the source interface to be measured of the utility model; The output of the utility model is received on the oscillograph, can see that then the phase noise spectrum figure in the clock source of surveying has analyzed.
The utility model is realized reference source signal through FPGA (Field-Programmable Gate Array, field programmable gate array), has avoided the introducing external noise, makes an uproar at the bottom of having reduced system to a great extent.Also source to be measured has been reduced simultaneously the requirement of each side such as noise, bandwidth.Because NCO and IIR are digital realization, do not have the problem of reference source noise.Therefore this device antijamming capability is strong, can not receive the external environment noise effect, is specially adapted in the strong magnetic interference environment such as nuclear magnetic resonance.This system bulk is little, is easy to carry, and is beneficial to engineering and uses.
Though through embodiment with reference to this programme; The utility model is illustrated and describes; But those of ordinary skill in the art should be understood that and can do various changes to it in form with on the details, and do not depart from the spirit and the scope of the utility model.
Claims (4)
1. phase noise measurement device; Comprise a source signal pre-processing module and a fpga chip; The input end of said source signal pre-processing module links to each other with simulation signal generator to be measured, it is characterized in that, comprises a signal analyzer and a reference source signal generator on the said fpga chip;
The output terminal of said source signal pre-processing module links to each other with reference source signal generator on the said fpga chip, the digital signal to be measured that is obtained by simulating signal pre-service to be measured to said reference source signal generator output;
Said reference source signal generator links to each other with said signal analyzer, exports the reference source signal that is converted to by said digital signal to be measured to said signal analyzer;
The input end of said signal analyzer links to each other with said reference source signal generator with said source signal pre-processing module respectively; The digital signal to be measured of said source signal pre-processing module output and the reference source signal of said reference source signal generator output are analyzed output phase noise measurement result.
2. phase noise measurement device according to claim 1; It is characterized in that, comprise in the said reference source signal generator: first wave filter, a gain amplification module, an integrator, an initial phase input source, a totalizer and a numerically-controlled oscillator;
Said first wave filter links to each other with said source signal pre-processing module, and the digital signal to be measured of said source signal pre-processing module output is carried out filtering, and said digital signal to be measured is limited to a pre-set frequency band and exports a frequency word;
Said gain amplification module links to each other with said first wave filter, adjusts the gain of the frequency word of said first wave filter output;
Said integrator links to each other with said gain amplification module, and the frequency word that said gain amplification module is exported converts the phase place word into;
The input end of said numerically-controlled oscillator links to each other through the output terminal of said totalizer with said initial phase input source and said integrator; Initial phase with said input is reference; Phase place word to said integrator output advances horizontal lock; Be locked on the said pre-set frequency band reference source signal after the output locking.
3. phase noise measurement device according to claim 1 and 2 is characterized in that, comprises in the said source signal pre-processing module: an automatic gain control module and an analog to digital converter;
The input end of said automatic gain control module links to each other with said simulation signal generator to be measured, and output terminal links to each other with said analog to digital converter, and the output terminal of said analog to digital converter and said automatic gain control module constitute a feedback circuit.
4. phase noise measurement device according to claim 1 and 2 is characterized in that, said signal analyzer comprises: a frequency mixer, second wave filter and one time domain-frequency domain modular converter;
The input end of said frequency mixer links to each other with said reference source signal generator with said source signal pre-processing module respectively, and the reference source signal of the digital signal to be measured of said source signal pre-processing module output, the output of said reference source signal generator is carried out convolution;
Said second wave filter links to each other with said frequency mixer, and the output result of said frequency mixer is carried out filtering;
Said time domain-frequency domain modular converter links to each other with said second wave filter, and the filtered of said second wave filter output is carried out time domain-frequency domain conversion, exports a phase noise measurement result.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217578A (en) * | 2013-04-24 | 2013-07-24 | 中国科学院力学研究所 | Digital phase meter and method for measuring phase difference between signals and based on phase-locked loop technology |
| CN103472319A (en) * | 2013-09-27 | 2013-12-25 | 北京无线电计量测试研究所 | Close-carrier frequency phase noise correcting device based on table-look-up compensation technology |
| CN104777375A (en) * | 2014-12-30 | 2015-07-15 | 北京无线电计量测试研究所 | Cross-correlation phase noise detecting device |
| CN104062514B (en) * | 2014-07-02 | 2017-03-01 | 中国电子科技集团公司第四十一研究所 | A kind of pulse carrier phase noise measurement device and measuring method |
| CN113138318A (en) * | 2021-04-27 | 2021-07-20 | 山东英信计算机技术有限公司 | Phase jitter test method and system |
-
2012
- 2012-03-21 CN CN2012201076112U patent/CN202502168U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217578A (en) * | 2013-04-24 | 2013-07-24 | 中国科学院力学研究所 | Digital phase meter and method for measuring phase difference between signals and based on phase-locked loop technology |
| CN103217578B (en) * | 2013-04-24 | 2015-11-04 | 中国科学院力学研究所 | Based on digital phasemeter and the method thereof of phase differential between PHASE-LOCKED LOOP PLL TECHNIQUE measuring-signal |
| CN103472319A (en) * | 2013-09-27 | 2013-12-25 | 北京无线电计量测试研究所 | Close-carrier frequency phase noise correcting device based on table-look-up compensation technology |
| CN103472319B (en) * | 2013-09-27 | 2016-08-24 | 北京无线电计量测试研究所 | A kind of close-carrier frequency phase noise correcting device based on table-look-up compensation technology |
| CN104062514B (en) * | 2014-07-02 | 2017-03-01 | 中国电子科技集团公司第四十一研究所 | A kind of pulse carrier phase noise measurement device and measuring method |
| CN104777375A (en) * | 2014-12-30 | 2015-07-15 | 北京无线电计量测试研究所 | Cross-correlation phase noise detecting device |
| CN113138318A (en) * | 2021-04-27 | 2021-07-20 | 山东英信计算机技术有限公司 | Phase jitter test method and system |
| CN113138318B (en) * | 2021-04-27 | 2022-05-06 | 山东英信计算机技术有限公司 | Phase jitter test method and system |
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Granted publication date: 20121024 Termination date: 20140321 |