CN102608418A - Frequency extension device and method based on dual-mixing down-conversion technology - Google Patents
Frequency extension device and method based on dual-mixing down-conversion technology Download PDFInfo
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- CN102608418A CN102608418A CN2012100522854A CN201210052285A CN102608418A CN 102608418 A CN102608418 A CN 102608418A CN 2012100522854 A CN2012100522854 A CN 2012100522854A CN 201210052285 A CN201210052285 A CN 201210052285A CN 102608418 A CN102608418 A CN 102608418A
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Abstract
The invention relates to a frequency extension device and method based on the dual-mixing down-conversion technology. The invention discloses a frequency extension device based on the dual-mixing down-conversion technology. The device comprises a first mixer, a second mixer, an isolation amplifier, a first low-pass filter, a second low-pass filter, a first amplifier, a second amplifier, a third low-pass filter and a fourth low-pass filter. The invention further discloses a measurement system based on the dual-mixing down-conversion technology, a frequency extension method based on the dual-mixing down-conversion technology and a signal measurement method based on the dual-mixing down-conversion technology. Through the invention, the shortcomings of the existing dual-mixing time difference measurement system are overcome. The invention has the advantages that: 1, the existing dual-mixing time difference measurement system can realize measurement of the microwave frequency band, and the upper limit of frequency is 18GHz; and 2, the stability of the second-level frequency can reach the 10<-16> order.
Description
Technical field
The present invention relates to a kind of frequency expansion apparatus and method based on two mixing down-conversion technique; Be specially adapted to the frequency stability measurement in the microwave and millimeter wave frequency range, the application of this apparatus and method can solve opctical frequency standard and the frequency stability measurement problem of superconduction resonator oscillator in microwave frequency band.
Background technology
Can see that from the Study on Technology achievement of forward position the short-term frequency stability of superconduction resonator oscillator (SCSO) is the highest, a second level degree of stability can reach 10
-15～10
-16, the frequency stability of the low-temperature superconducting resonator oscillator of Stein and Turneaure development at present can reach 3 * 10
-16/ (1s-1000s), frequency of operation is 8.6GHz.Based on the development of the temperature-measuring method of modern microwave technology, high resolution, passive vibration isolation and piezoelectric tilt alignment technique, make the frequency stability of SCSO can reach 10
-17～10
-18Level.Remove this, also carried out the research of sapphire medium superconducting resonator (SLOSC) abroad, department of physics of Univ Western Australia has succeeded in developing SLOSC, and its frequency stability reaches 6 * 10
-14/ 10s, the QL of resonator cavity are 3.8 * 10
8The jet laboratory of U.S. NASA (JPL) is for Cassini-Huygens plan development low-temperature microwave oscillator, like 10K temperature compensation microwave oscillator, 77K temperature compensated oscillator, SUMO etc.In recent years, rapid in the progress of atomic frequency standard development technical elements both at home and abroad, caesium fountain clock is superior to 10 in the degree of stability of microwave frequency band
-15, the atomic frequency standard degree of stability it is believed that and can also be largely increased in the development potentiality of optical field.
Frequency stability measurement system in the market mainly is based on and develops on the basis of beat method measuring principle, two mixing time difference method measuring principle and frequency difference multiplication method measuring principle.
The beat method measuring system 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 system self frequency stability, the short-term frequency stability of the high stability crystal oscillator and the atomic frequency standard of high stability standard frequency can't be measured by this system.System forms and comprises: reference source, beat device, frequency multiplier, counter and computing machine.
The frequency difference multiplication method measuring system only can the measurement standard frequency high stability crystal oscillator and the frequency stability of atomic frequency standard, but this system but can't measuring light frequency marking and superconduction resonator oscillator.System forms: reference source, frequency difference multiplier, counter and computing machine.
Two mixing time difference method measuring systems can the measurement standard frequency high stability crystal oscillator and the frequency stability of atomic frequency standard, its second level self frequency stability can reach 10
-14Magnitude, but this system frequency stability of energy measurement standard frequency 5MHz, 10MHz only, frequency range has limitation.System forms and comprises: reference source, common source, binary channels beat device, isolated amplifier, phase shifter, counter and computing machine.
Because present superconduction resonator oscillator and the opctical frequency standard of representing with caesium fountain Zhong Wei have obtained great raising in the degree of stability index of microwave frequency band; So need remedy the limitation of two mixing time difference measurement systems aspect frequency range, enable to measure the frequency stability of microwave frequency band.
Summary of the invention
The object of the invention is to provide a kind of frequency expansion device based on two mixing down-conversion technique; Solve superconduction resonator oscillator and the opctical frequency standard problems of measurement in the degree of stability index of microwave frequency band: 1, two mixing time difference measurement system has limitation aspect the frequency range, not the degree of stability of energy measurement microwave frequency band; 2, system is when standard frequency 5MHz, 10MHz, and second level self frequency stability is 10
-14Magnitude can't be measured a second level degree of stability 10
-15～10
-16Between source to be measured.
According to an aspect of the present invention; A kind of frequency expansion device based on two mixing down-conversion technique is provided, and this device comprises: first frequency mixer, second frequency mixer, isolated amplifier, first low-pass filter, second low-pass filter, first amplifier, second amplifier, the 3rd low-pass filter and the 4th low-pass filter;
The local oscillator termination of first frequency mixer is received measured signal; The input end of isolated amplifier receives common signal; The local oscillator termination of second frequency mixer is received reference signal; The end to be measured of isolated amplifier is connected with the radio-frequency head microwave cable of first frequency mixer; The reference edge of isolated amplifier is connected with the radio-frequency head microwave cable of second frequency mixer, and the intermediate frequency end of first frequency mixer is connected with the input end radio-frequency cable of first low-pass filter, and the intermediate frequency end of second frequency mixer is connected with the input end radio-frequency cable of second low-pass filter; The output terminal of first low-pass filter is connected with the output terminal radio-frequency cable of first amplifier; The output terminal of second low-pass filter is connected with the output terminal radio-frequency cable of second amplifier, and the output terminal of first amplifier is connected with the input end radio-frequency cable of the 3rd low-pass filter, and the output terminal of second amplifier is connected with the input end radio-frequency cable of the 4th low-pass filter; The 3rd low-pass filter is exported treated measured signal, and the 4th low-pass filter is exported treated reference signal.
Preferably, said reference signal is identical with the frequency of measured signal.
Preferably, the upper frequency limit of said measured signal is 18GHz.
According to another aspect of the present invention, a kind of measuring system based on two mixing down-conversion technique is provided, this system comprises two mixing time difference measurement systems, and expanding unit as claimed in claim 1.
Preferably, said pair of mixing time difference measurement system further comprises:
The source to be measured of measured signal is provided;
The common source of common signal is provided;
The reference source of reference signal is provided; And
Two mixing time difference measuring devices, this pair mixing time difference measuring device receives from the treated measured signal of said expanding unit and treated reference signal, and said measured signal is measured.
According to a further aspect of the invention, a kind of frequency expanding method based on two mixing down-conversion technique is provided, this method comprises:
Common signal is assigned as first common signal and second common signal through isolated amplifier,
First common signal and measured signal carry out mixing through first frequency mixer, and through first low pass filter filters out wherein obtain the first difference frequency signal with frequency component and fundamental component,
This first difference frequency signal amplifies through first amplifier, and through the 3rd low pass filter filters out noise, obtains treated measured signal;
The reference signal of second common signal and reference source output is carried out mixing through second frequency mixer, and through second low pass filter filters out wherein obtain the second difference frequency signal with frequency component and fundamental component,
This second difference frequency signal amplifies through second amplifier, and through the 4th low pass filter filters out noise, obtains treated reference signal.
According to a further aspect of the invention, a kind of signal measurement method based on two mixing down-conversion technique is provided, this method comprises:
With common signal distribution is first common signal and second common signal,
With the measured signal and the first common signal mixing, and through the first mixed frequency signal filtering that obtains is obtained the first difference frequency signal,
This first difference frequency signal is amplified and filtering, obtain treated measured signal;
With the reference signal and the second common signal mixing, and through the second mixed frequency signal filtering that obtains is obtained the second difference frequency signal,
This second difference frequency signal is amplified and filtering, obtain treated reference signal;
Through said treated measured signal and said treated reference signal are carried out two mixing time difference measurements, said measured signal is measured.
Reference signal f
RWith measured signal f
xFrequency identical, frequency stability is on close level, both through with common signal f
cCarry out mixing and obtain difference frequency signal f
x-f
c, this has enlarged f with the phase change between reference signal and the measured signal
x/ (f
x-f
c), the frequency range of common signal can cover measured signal f
xThis method can further be optimized the bottom noise level of measuring system, the frequency range of expanding system.
Based on the frequency expansion device of two mixing down-conversion technique, overcome the deficiency of at present two mixing time difference measurement systems, it has the following advantages: 1, can make the measurement of present two mixing time difference measurement system realization microwave frequency band, upper frequency limit is 18GHz; 2, self second the level frequency stability can reach 10
-16Magnitude.
Description of drawings
Fig. 1 illustrates the measuring system based on two mixing down-conversion technique according to the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further set forth.
Fig. 1 illustrates the measuring system based on two mixing down-conversion technique according to the embodiment of the invention; This system comprises two mixing time difference measurement systems and based on the frequency expansion device of two mixing down-conversion technique; This pair mixing time difference measurement system comprises the common source that common signal is provided; The reference source of reference signal is provided, and two mixing time difference measuring device; This pair mixing time difference measuring device receives from the treated measured signal of said expanding unit and treated reference signal, and said measured signal is measured.
As shown in Figure 1, comprise based on the frequency expansion device of two mixing down-conversion technique: first frequency mixer, second frequency mixer, isolated amplifier, first low-pass filter, second low-pass filter, first amplifier, second amplifier, the 3rd low-pass filter and the 4th low-pass filter.
The local oscillator termination of first frequency mixer is received measured signal; The input end of isolated amplifier receives common signal; The local oscillator termination of second frequency mixer is received reference signal; The end to be measured of isolated amplifier is connected with the radio-frequency head microwave cable of first frequency mixer; The reference edge of isolated amplifier is connected with the radio-frequency head microwave cable of second frequency mixer, and the intermediate frequency end of first frequency mixer is connected with the input end radio-frequency cable of first low-pass filter, and the intermediate frequency end of second frequency mixer is connected with the input end radio-frequency cable of second low-pass filter; The output terminal of first low-pass filter is connected with the output terminal radio-frequency cable of first amplifier; The output terminal of second low-pass filter is connected with the output terminal radio-frequency cable of second amplifier, and the output terminal of first amplifier is connected with the input end radio-frequency cable of the 3rd low-pass filter, and the output terminal of second amplifier is connected with the input end radio-frequency cable of the 4th low-pass filter; The 3rd low-pass filter is exported treated measured signal, and the 4th low-pass filter is exported treated reference signal.
According to the embodiment of the invention, the upper frequency limit of said measured signal from source to be measured is 18GHz.
With reference to figure 1; During work, common signal is assigned as first common signal and second common signal through isolated amplifier, and first common signal and measured signal carry out mixing through first frequency mixer; And through first low pass filter filters out wherein with frequently and fundamental component obtain the first difference frequency signal; This first difference frequency signal amplifies through first amplifier, and through the 3rd low pass filter filters out noise, obtains treated measured signal and use.The reference signal of second common signal and reference source output is carried out mixing through second frequency mixer; And through second low pass filter filters out wherein with frequently and fundamental component obtain the second difference frequency signal; This second difference frequency signal amplifies through second amplifier; And through the 4th low pass filter filters out noise; Obtain treated reference signal,, said measured signal is measured through said treated measured signal and treated reference signal are carried out two mixing time difference measurements.
Reference signal f
RWith measured signal f
xFrequency identical, frequency stability is on close level, both through with common signal f
cCarry out mixing and obtain difference frequency signal f
x-f
c, this has enlarged f with the phase change between reference signal and the measured signal
x/ (f
x-f
c), the frequency range of common signal can cover measured signal f
x, said two-way difference frequency signal is sent into two mixing time difference measurement systems carries out phase measurement.This method can further be optimized the bottom noise level of measuring system, the frequency range of expanding system.The upper frequency limit of said measured signal from source to be measured is 18GHz.
Should be appreciated that and abovely technical scheme of the present invention is specified by the preferred embodiments of the present invention.Those of ordinary skill in the art is reading on the basis of instructions of the present invention and can make amendment to the technical scheme that embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.Protection scope of the present invention is only limited the claims of enclosing.
Claims (7)
1. frequency expansion device based on two mixing down-conversion technique; It is characterized in that this device comprises: first frequency mixer, second frequency mixer, isolated amplifier, first low-pass filter, second low-pass filter, first amplifier, second amplifier, the 3rd low-pass filter and the 4th low-pass filter;
The local oscillator termination of first frequency mixer is received measured signal; The input end of isolated amplifier receives common signal; The local oscillator termination of second frequency mixer is received reference signal; The end to be measured of isolated amplifier is connected with the radio-frequency head microwave cable of first frequency mixer; The reference edge of isolated amplifier is connected with the radio-frequency head microwave cable of second frequency mixer, and the intermediate frequency end of first frequency mixer is connected with the input end radio-frequency cable of first low-pass filter, and the intermediate frequency end of second frequency mixer is connected with the input end radio-frequency cable of second low-pass filter; The output terminal of first low-pass filter is connected with the output terminal radio-frequency cable of first amplifier; The output terminal of second low-pass filter is connected with the output terminal radio-frequency cable of second amplifier, and the output terminal of first amplifier is connected with the input end radio-frequency cable of the 3rd low-pass filter, and the output terminal of second amplifier is connected with the input end radio-frequency cable of the 4th low-pass filter; The 3rd low-pass filter is exported treated measured signal, and the 4th low-pass filter is exported treated reference signal.
2. the frequency expansion device based on two mixing down-conversion technique according to claim 1 is characterized in that said reference signal is identical with the frequency of measured signal.
3. the frequency expansion device based on two mixing down-conversion technique according to claim 1 is characterized in that the upper frequency limit of said measured signal is 18GHz.
4. the measuring system based on two mixing down-conversion technique is characterized in that, this system comprises two mixing time difference measurement systems, and expanding unit as claimed in claim 1.
5. the measuring system based on two mixing down-conversion technique according to claim 4 is characterized in that, said pair of mixing time difference measurement system further comprises:
The source to be measured of measured signal is provided;
The common source of common signal is provided;
The reference source of reference signal is provided; And
Two mixing time difference measuring devices, this pair mixing time difference measuring device receives from the treated measured signal of said expanding unit and treated reference signal, and said measured signal is measured.
6. the frequency expanding method based on two mixing down-conversion technique is characterized in that, this method comprises:
Common signal is assigned as first common signal and second common signal through isolated amplifier,
First common signal and measured signal carry out mixing through first frequency mixer, and through first low pass filter filters out wherein obtain the first difference frequency signal with frequency component and fundamental component,
This first difference frequency signal amplifies through first amplifier, and through the 3rd low pass filter filters out noise, obtains treated measured signal;
The reference signal of second common signal and reference source output is carried out mixing through second frequency mixer, and through second low pass filter filters out wherein obtain the second difference frequency signal with frequency component and fundamental component,
This second difference frequency signal amplifies through second amplifier, and through the 4th low pass filter filters out noise, obtains treated reference signal.
7. signal measurement method based on two mixing down-conversion technique is characterized in that this method comprises:
With common signal distribution is first common signal and second common signal,
With the measured signal and the first common signal mixing, and through the first mixed frequency signal filtering that obtains is obtained the first difference frequency signal,
This first difference frequency signal is amplified and filtering, obtain treated measured signal;
With the reference signal and the second common signal mixing, and through the second mixed frequency signal filtering that obtains is obtained the second difference frequency signal,
This second difference frequency signal is amplified and filtering, obtain treated reference signal;
Through said treated measured signal and said treated reference signal are carried out two mixing time difference measurements, said measured signal is measured.
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| CN2012100522854A CN102608418A (en) | 2012-03-01 | 2012-03-01 | Frequency extension device and method based on dual-mixing down-conversion technology |
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| CN2012100522854A CN102608418A (en) | 2012-03-01 | 2012-03-01 | Frequency extension device and method based on dual-mixing down-conversion technology |
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Cited By (1)
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| 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 |
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