CN201886081U - Loose phase lock method-based short-term frequency stability measuring device - Google Patents
Loose phase lock method-based short-term frequency stability measuring device Download PDFInfo
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- CN201886081U CN201886081U CN201020582909XU CN201020582909U CN201886081U CN 201886081 U CN201886081 U CN 201886081U CN 201020582909X U CN201020582909X U CN 201020582909XU CN 201020582909 U CN201020582909 U CN 201020582909U CN 201886081 U CN201886081 U CN 201886081U
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Abstract
The utility model discloses a loose phase lock method-based short-term frequency stability measuring device which comprises a reference source (1), a frequency mixer (2), a low pass filter (3), a low noise amplifier (4), a voltage-frequency converter (5), a counter (6), a computer (7), a feedback loop (8) and a source (9) to be measured. An output signal of the frequency mixer (2) is transmitted into the feedback loop (8) by the low pass filter (3), two signals are kept to have the quadrature phase of 90 degrees by the feedback loop (8), and voltage fluctuation which is amplified by the low noise is overlapped on a fixed direct current bias voltage and is inputted to the voltage-frequency converter (5) to obtain the short-term frequency stability of the source (9) to be measured. On the one hand, the device is extremely high in resolution, thereby being good in bottom noise stability; and on the other hand, the device is simple in formation, thereby being convenient to measure.
Description
Technical field
The utility model relates to a kind of short-term frequency stability measurement mechanism, particularly a kind of short-term frequency stability measurement mechanism based on loose phase locking technique.
Background technology
Existing short-term frequency stability measurement mechanism is beat method measurement mechanism or two mixing time difference method measurement mechanism.The beat method measurement mechanism is made up of reference source, beat device, frequency multiplier, counter and computing machine.The beat method measurement mechanism can be measured the short-term frequency stability in the fractional frequency source in the broad frequency range, but be limited by the influence of reference source and device self frequency stability, this device can't be measured the short-term frequency stability of high stability standard frequency crystal oscillator and atomic frequency standard.
Two mixing time difference method measurement mechanisms are made up of reference source, common source, binary channels beat device, isolated amplifier, phase shifter, counter and computing machine.Two mixing time difference method measurement mechanisms can the measurement standard frequency high stability crystal oscillator and the frequency stability of atomic frequency standard, but be limited by the influence of the initial time difference and common source noise contribution for system's homeostasis degree, the foundation complexity of this device, especially at the measurement of short-term frequency stability, limited in one's ability.
The utility model content
The utility model purpose is to provide a kind of short-term frequency stability measurement mechanism based on loose phase locking technique, solve and install the short-term frequency stability that to measure high stability standard frequency crystal oscillator and atomic frequency standard in the past, and device is set up complicated problems.
A kind of short-term frequency stability measurement mechanism based on loose phase locking technique comprises: reference source, counter, computing machine, source to be measured also comprise: frequency mixer, low-pass filter, low noise amplifier, voltage-frequency converter, feedback control loop.
The reference source output terminal is connected with frequency mixer input end radio-frequency cable, source output terminal to be measured is connected with frequency mixer input end radio-frequency cable, mixer output is connected with low-pass filter input end radio-frequency cable, the low-pass filter output terminal is connected with low noise amplifier input end radio-frequency cable, the low noise amplifier output terminal is connected with voltage-frequency converter input end radio-frequency cable, voltage-frequency converter output terminal sum counter input end radio-frequency cable connects, counter output is connected with computing machine input end serial bus, the low-pass filter output terminal is connected with feedback control loop input end radio-frequency cable, and the feedback control loop output terminal is connected with source to be measured input end radio-frequency cable.
Mixer output signal is sent into feedback control loop through behind the low-pass filter, and reference source is locked on the source to be measured; Two paths of signals through feedback control loop keeps quadrature phase to be 90 °, and frequency mixer output average voltage is zero, and real-time voltage fluctuation is phase fluctuation; Be superimposed upon on the fixing dc offset voltage through the voltage fluctuation after the low noise amplification, input to voltage-frequency converter, obtain the linear corresponding relation of voltage and frequency, deliver to counter then, the computer measurement frequency obtains the short-term frequency stability in source to be measured.
Resolving power of the present invention is high, self has superior bottom noise stability; The composition of this device is simple and easy on the other hand, and it is convenient to implement to measure.Because the degree of stability index of high stability crystal oscillator and atomic frequency standard has obtained great raising at present, in order to remedy the measurement defective of the beat method measuring principle and the short-term frequency stability of two mixing time difference method measuring principles, development is based on the short-term frequency stability measurement mechanism of loose phase locking technique measuring principle.Remedy frequency stability measurement instrument in the market and can't measure the short-term frequency stability of high stability standard frequency crystal oscillator and atomic frequency standard, filled up domestic blank.
Description of drawings
The principle composition frame chart of a kind of short-term frequency stability measurement mechanism based on loose phase locking technique of Fig. 1.
1. reference source 2. frequency mixer 3. low-pass filters 4. low noise amplifiers 5. voltage-frequency converters 6. counters 7. computing machines 8. feedback control loops 9. sources to be measured
Embodiment
A kind of short-term frequency stability measurement mechanism based on loose phase locking technique comprises: reference source 1, counter 6, computing machine 7, source to be measured 9 also comprise: frequency mixer 2, low-pass filter 3, low noise amplifier 4, voltage-frequency converter 5, feedback control loop 8.
Reference source 1 output terminal is connected with frequency mixer 2 input end radio-frequency cables, source to be measured 9 output terminals are connected with frequency mixer 2 input end radio-frequency cables, frequency mixer 2 output terminals are connected with low-pass filter 3 input end radio-frequency cables, low-pass filter 3 output terminals are connected with low noise amplifier 4 input end radio-frequency cables, low noise amplifier 4 output terminals are connected with voltage-frequency converter 5 input end radio-frequency cables, voltage-frequency converter 5 output terminal sum counters 6 input end radio-frequency cables connect, counter 6 output terminals are connected with computing machine 7 input end serial bus, low-pass filter 3 output terminals are connected with feedback control loop 8 input end radio-frequency cables, and feedback control loop 8 output terminals are connected with source to be measured 9 input end radio-frequency cables.
Frequency mixer 2 output signals are sent into feedback control loop 8 through behind the low-pass filter 3, and reference source 1 is locked on the source 9 to be measured; Two paths of signals through feedback control loop 8 keeps quadrature phase to be 90 °, and frequency mixer 2 output average voltages are zero, and real-time voltage fluctuation is phase fluctuation; Be superimposed upon on the fixing dc offset voltage through the voltage fluctuation after the low noise amplification, input to voltage-frequency converter 5, obtain the linear corresponding relation of voltage and frequency, deliver to counter 6 then, computing machine 7 survey frequencies obtain the short-term frequency stability in source 9 to be measured.
Claims (1)
1. short-term frequency stability measurement mechanism based on loose phase locking technique, comprise: reference source (1), counter (6), computing machine (7), source to be measured (9) is characterized in that also comprising: frequency mixer (2), low-pass filter (3), low noise amplifier (4), voltage-frequency converter (5), feedback control loop (8);
Reference source (1) output terminal is connected with frequency mixer (2) input end radio-frequency cable, source to be measured (9) output terminal is connected with frequency mixer (2) input end radio-frequency cable, frequency mixer (2) output terminal is connected with low-pass filter (3) input end radio-frequency cable, low-pass filter (3) output terminal is connected with low noise amplifier (4) input end radio-frequency cable, low noise amplifier (4) output terminal is connected with voltage-frequency converter (5) input end radio-frequency cable, voltage-frequency converter (5) output terminal sum counter (6) input end radio-frequency cable connects, counter (6) output terminal is connected with computing machine (7) input end serial bus, low-pass filter (3) output terminal is connected with feedback control loop (8) input end radio-frequency cable, and feedback control loop (8) output terminal is connected with source to be measured (9) input end radio-frequency cable;
To send into feedback control loop (8) behind frequency mixer (2) the output signal process low-pass filter (3), reference source (1) is locked on the source to be measured (9); Two paths of signals through feedback control loop (8) keeps quadrature phase to be 90 °, and frequency mixer (2) output average voltage is zero, and real-time voltage fluctuation is phase fluctuation; Be superimposed upon on the fixing dc offset voltage through the voltage fluctuation after the low noise amplification, input to voltage-frequency converter (5), obtain the linear corresponding relation of voltage and frequency, deliver to counter (6) then, computing machine (7) survey frequency obtains the short-term frequency stability of source to be measured (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020582909XU CN201886081U (en) | 2010-10-29 | 2010-10-29 | Loose phase lock method-based short-term frequency stability measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201020582909XU CN201886081U (en) | 2010-10-29 | 2010-10-29 | Loose phase lock method-based short-term frequency stability measuring device |
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| CN201886081U true CN201886081U (en) | 2011-06-29 |
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| CN201020582909XU Expired - Fee Related CN201886081U (en) | 2010-10-29 | 2010-10-29 | Loose phase lock method-based short-term frequency stability measuring device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608416A (en) * | 2012-03-01 | 2012-07-25 | 北京无线电计量测试研究所 | Dual mixer time difference measurement system and method based on cross-correlation technology |
| CN102608418A (en) * | 2012-03-01 | 2012-07-25 | 北京无线电计量测试研究所 | Frequency extension device and method based on dual-mixing down-conversion technology |
| CN103487648A (en) * | 2013-09-25 | 2014-01-01 | 南京理工大学 | Sigma-delta PLL frequency measuring circuit and method |
-
2010
- 2010-10-29 CN CN201020582909XU patent/CN201886081U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608416A (en) * | 2012-03-01 | 2012-07-25 | 北京无线电计量测试研究所 | Dual mixer time difference measurement system and method based on cross-correlation technology |
| CN102608418A (en) * | 2012-03-01 | 2012-07-25 | 北京无线电计量测试研究所 | Frequency extension device and method based on dual-mixing down-conversion technology |
| CN102608416B (en) * | 2012-03-01 | 2014-07-23 | 北京无线电计量测试研究所 | Dual mixer time difference measurement system and method based on cross-correlation technology |
| CN103487648A (en) * | 2013-09-25 | 2014-01-01 | 南京理工大学 | Sigma-delta PLL frequency measuring circuit and method |
| CN103487648B (en) * | 2013-09-25 | 2015-12-02 | 南京理工大学 | Sigma-delta PLL frequency measurement circuit and method |
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Granted publication date: 20110629 Termination date: 20141029 |
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| EXPY | Termination of patent right or utility model |