CN105245224B - A kind of low phase noise microwave local oscillation generating means and method - Google Patents
A kind of low phase noise microwave local oscillation generating means and method Download PDFInfo
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Abstract
The present invention proposes a kind of low phase noise microwave local oscillation generating means, after wide-band microwave oscillator feedback signal is by wide-band microwave signal conditioning circuit, it is first to carry out lower mixing with wherein some frequency of high-purity down coversion local oscillator group local oscillation signal, wide-band microwave oscillator feedback signal is converted to after the radio frequency band of lower frequency from the microwave frequency band of upper frequency and is mixed again with low noise RF local oscillator, the intermediate-freuqncy signal and the reference signal from fractional frequency-division phase-locked loop for being mixed output carry out phase demodulation, phase demodulation exports the control terminal that wide-band microwave oscillator is added to after loop integrator, it is required low phase noise microwave local oscillation to make its output.The present invention breaches the technical bottleneck that legacy frequencies synthesis is restricted using the nearly Carrier Phase Noise of local oscillation signal is synthesized in sampling frequency mixing method by sampling local oscillator noise, makes the phase noise specifications of microwave synthesis local oscillation signal have further raising.
Description
Technical field
The present invention relates to technical field of measurement and test, more particularly to a kind of low phase noise microwave local oscillation generating means, further relate to
A kind of low phase noise microwave local oscillation generation method.
Background technology
Microwave test instrument has higher requirement to the frequency resolution of local vibration source, phase noise and the index such as spuious,
Therefore, in wide-band microwave signal frequency combiner circuit, the polycyclic lock phase structure of local oscillation circuit generally use, as shown in Figure 1, tradition side
Case generally comprises low noise reference source circuit, integer or fractional-N PLL circuit, low noise sampling local oscillation circuit, samples and mix
Frequency circuit, sampling intermediate frequency modulate circuit, phase discriminator, loop integrator, wide-band microwave oscillator, wide-band microwave signal conditioning circuit
Etc. link.
The reference that low noise reference source circuit produces fractional-N PLL circuit and low noise sampling local oscillation circuit needs
Signal.
Fractional-N PLL circuit produces the phase demodulation reference signal needed for synthetic wideband microwave signal, and reference signal is most
Small step frequency decides the minimum step frequency of final composite signal.
Low noise sampling local oscillation circuit produces the low noise sampling local oscillation signal needed for synthetic wideband microwave signal, is synthesis
The key constraints of the nearly Carrier Phase Noise of wide-band microwave signal.
Sampling frequency mixer is completed wide-band microwave signal and the harmonic wave of broadband sampling local oscillation signal and is mixed, output frequency compared with
Low sampling intermediate-freuqncy signal.
Sampling intermediate-freuqncy signal modulate circuit is filtered and amplifies to the signal after sampling mixing output, filters out wide-band microwave
Harmonic wave of signal, broadband sampling local oscillation signal and sampling intermediate-freuqncy signal etc., and sampling intermediate-freuqncy signal is amplified to required power.
Phase discriminator completes the reference signal of fractional-N PLL circuit output and the phase demodulation of sampling intermediate-freuqncy signal.
Loop integrator realizes integration and the filtering of phase discrimination signal, produces integral voltage, exports to wide-band microwave oscillator
Realize the locking of phase-locked loop.
Wide-band microwave oscillator produces desired wide-band microwave signal.
Wide-band microwave signal conditioning circuit realizes the amplification and filtering of wide-band microwave signal.
The combiner circuit of low noise local oscillator shown in Fig. 1, frequency synthesis tuning equation are：
FO-N*FS=± FIF, FIF=FR
In above formula, FOFor microwave oscillator frequency of oscillation, FSLocal frequency, F are sampled for wideband low noiseIFTo sample intermediate frequency
Frequency, FRFor the phase demodulation reference frequency of fractional frequency division circuit output, N is sampling overtone order.
Wide-band microwave oscillator, it is usual with very wide operating frequency range and fine such as yig tuned oscillator (YTO)
Carrier wave distal end phase noise, be widely used in the design of microwave signal generator or microwave local oscillator.
In the frequency synthesis mode of sampling mixing shown in Fig. 1, signal F is exportedORemote Carrier Phase Noise relies on oscillator certainly
Body, the phase noise of carrier wave near-end are limited to loop.Sample local oscillator FSSideband noise can be directly superimposed to sampling intermediate frequency on, and
Using the speed penalty of 20lgN (dB) (N is sampling overtone order).
In general, sampling local oscillator FSFrequency is hundreds of MHz, and the phase noise specifications at frequency deviation 10kHz are better than -140dBc/
Hz.So high index has almost sampled the limit of local oscillator hardware circuit design.Therefore, it is limited to FSSample local oscillator letter
The influence of number phase noise, further improves wide-band microwave signal F on the basis of this schemeOPhase noise specifications very
It is difficult.
The content of the invention
The present invention proposes a kind of low phase noise microwave local oscillation generating means and method, to traditional microwave phase-locked loop structures
It is improved, has evaded the harmonic wave Sampling mixing link for deteriorating phase noise, the microwave local oscillation of more low phase noise can be obtained
Signal.
The technical proposal of the invention is realized in this way：
A kind of low phase noise microwave local oscillation generating means, wide-band microwave oscillator feedback signal pass through wide-band microwave signal
After modulate circuit, first the local oscillation signal with wherein some frequency of high-purity down coversion local oscillator group carries out lower mixing, broadband
Microwave oscillator feedback signal is converted to after the radio frequency band of lower frequency from the microwave frequency band of upper frequency and is penetrated again with low noise
Frequency local oscillator is mixed, and the intermediate-freuqncy signal and the reference signal from fractional frequency-division phase-locked loop for being mixed output carry out phase demodulation, phase demodulation
Output is added to the control terminal of wide-band microwave oscillator after loop integrator, and it is required low phase noise microwave sheet to make its output
Shake.
Alternatively, above-mentioned low phase noise microwave local oscillation generating means, including：Low noise reference source, fractional frequency division lock phase
Ring, low noise RF local oscillator, high-purity down coversion local oscillator group, phase discriminator, low intermediate frequency signal modulate circuit, the second frequency mixer, senior middle school
Frequency signal conditioning circuit, the first frequency mixer, loop integrator, wide-band microwave oscillator, wide-band microwave signal conditioning circuit；
Low noise RF local oscillator and the low intermediate frequency signal and fractional frequency division as reference exported after medium-and-high freuqncy signal mixing
Phase-locked loop frequency scope is suitable；
High-purity down coversion local oscillator group includes high-purity local oscillator of 5 kinds of different frequencies, by switching selection one of which and broadband
Radiological feedback signal carries out down coversion, makes the intermediate-freuqncy signal after mixing suitable with the frequency range of low noise RF local oscillator；
Low intermediate frequency signal modulate circuit realizes the filtering and amplification of low intermediate frequency signal；
Second frequency mixer realizes high-purity down coversion local oscillator and is mixed under wide-band microwave signal that mixing output is believed for high intermediate frequency
Number；
Medium-and-high freuqncy signal modulate circuit realizes the filtering and amplification of medium-and-high freuqncy signal；
First frequency mixer realizes the mixing of low noise RF local oscillator and medium-and-high freuqncy signal, and mixing output is low intermediate frequency signal.
Alternatively, high-purity down coversion local oscillator group includes 5 kinds of high-purity local frequencies altogether, is respectively：2.4GHz、
3.6GHz, 4.8GHz, 6.0GHz and 7.2GHz.
Alternatively, high-purity down coversion local oscillator group includes：
The high-purity local oscillators 21 of 4.8GHz, the high-purity local oscillators of 4.8GHz come from low noise reference source；
High-purity local oscillator of 4.8GHz all the way is divided into the two paths of signals of equal-wattage by power divider 22；
Input signal is realized the signal output after frequency dividing by programmable frequency divider 23 according to the frequency dividing ratio of setting；
First single-pole double-throw switch (SPDT) 24 is realized the wherein signal gating all the way in two paths of signals；
First hilted broadsword, four throw switch 25 is realized the wherein signal gating all the way in four road signals；
Three-mixer 26 is realized two-way input signal is mixed after export；
1.2GHz bandpass filters 27 realize the narrow-band filtering that centre frequency is 1.2GHz；
2.4GHz bandpass filters 28 realize the narrow-band filtering that centre frequency is 2.4GHz；
3.6GHz bandpass filters 29 realize the narrow-band filtering that centre frequency is 3.6GHz；
Second single-pole double-throw switch (SPDT) 210 is realized the wherein signal gating all the way in two paths of signals；
Second hilted broadsword, four throw switch 211 is realized the wherein signal gating all the way in four road signals；
3rd hilted broadsword, four throw switch 212 is realized the wherein signal gating all the way in four road signals.
Alternatively, the generation of the high-purity down coversion local oscillators of 2.4GHz is set：
The high-purity local oscillators 21 of 4.8GHz are divided by power divider 22 sets two points for two-way, programmable frequency divider 23
Frequently, four throw switch 25 of the first hilted broadsword and four throw switch 211 of the second hilted broadsword is set to choose 2.4GHz bandpass filters 28, then by the
Two single-pole double-throw switch (SPDT)s 210 and four throw switch 212 of the 3rd hilted broadsword choose respective channel to export the high-purity local oscillators of 2.4GHz.
Alternatively, the generation of the high-purity down coversion local oscillators of 3.6GHz is set：
The high-purity local oscillators 21 of 4.8GHz are divided by power divider 22 sets four frequency dividings for two-way, programmable frequency divider 23, if
Put four throw switch 25 of the first hilted broadsword and four throw switch 211 of the second hilted broadsword chooses 3.6GHz bandpass filters 29, then it is single by second
Double-pole double throw switch 210 and four throw switch 212 of the 3rd hilted broadsword choose respective channel to export the high-purity local oscillators of 3.6GHz.
Alternatively, the generation of the high-purity down coversion local oscillators of 4.8GHz is set：
The high-purity local oscillators 21 of 4.8GHz are divided for two-way by power divider 22, then by the first single-pole double-throw switch (SPDT) 24 and the
Three hilted broadswords, four throw switch 212 chooses respective channel to export the high-purity local oscillators of 4.8GHz.
Alternatively, the generation of the high-purity down coversion local oscillators of 6.0GHz is set：
The high-purity local oscillators 21 of 4.8GHz are divided by power divider 22 sets four frequency dividings for two-way, programmable frequency divider 23, if
Put four throw switch 25 of the first hilted broadsword and four throw switch 211 of the second hilted broadsword chooses 1.2GHz bandpass filters 27, then it is single by second
Double-pole double throw switch 210 enters three-mixer 26；First single-pole double-throw switch (SPDT) 24 gating is set into the letter of three-mixer 26
Number path, the signal path for setting four throw switch 212 of the 3rd hilted broadsword gating three-mixer 26 to export, output signal are
The high-purity local oscillators of 6.0GHz.
Alternatively, the generation of the high-purity down coversion local oscillators of 7.2GHz is set：
The high-purity local oscillators 21 of 4.8GHz are divided by power divider 22 sets two divided-frequency for two-way, programmable frequency divider 23, if
Put four throw switch 25 of the first hilted broadsword and four throw switch 211 of the second hilted broadsword chooses 2.4GHz bandpass filters 28, then it is single by second
Double-pole double throw switch 210 enters three-mixer 26；First single-pole double-throw switch (SPDT) 24 gating is set into the letter of three-mixer 26
Number path, the signal path for setting four throw switch 212 of the 3rd hilted broadsword gating three-mixer 26 to export, output signal are
The high-purity local oscillators of 7.2GHz.
Based on above device, the invention also provides a kind of low phase noise microwave local oscillation generation method, including following step
Suddenly：
Step 1：Reference source oscillating circuit working status is set, makes reference source working properly；
Step 2：Wide-band microwave combiner circuit phaselocked loop is set to be in open loop situations, it is preset according to the frequency of user setting
Wide-band microwave oscillator operating frequency FO；
Step 3：High-purity down coversion local oscillator group circuit working state is set, it is high-purity corresponding to be allowed to generation setting frequency point
Shake signal FD；
Step 4：Low noise RF local oscillator loop work state is set, is allowed to produce the corresponding low noise sheet of setting frequency point
Shake signal FS；
Step 5：The working status of fractional-N PLL circuit is set, is allowed to produce the corresponding low noise of setting frequency point
Reference signal FR；
Step 6：Predetermined stabilization time is set, makes low noise local oscillation signal FSWith fractional frequency division reference signal FRWork is steady
It is fixed；
Step 7：Set wide-band microwave combiner circuit phaselocked loop to be in closed loop states, wait the scheduled time to be placed, make width
Band microwave oscillator frequency FOWorking stability.
The beneficial effects of the invention are as follows：
Legacy frequencies synthesis is breached to be sampled using the synthesis nearly Carrier Phase Noise of local oscillation signal in sampling frequency mixing method
The technical bottleneck that local oscillator noise restricts, makes the phase noise specifications of microwave synthesis local oscillation signal have further raising.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is existing low noise local oscillator composition principle block diagram；
Fig. 2 is the local oscillator composition principle block diagram of the present invention；
Fig. 3 is high-purity down coversion local oscillator group functional block diagram of the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
The nearly Carrier Phase Noise of the wideband low noise frequency combining method used at present is limited to sampling local oscillation signal
Harmonic wave Sampling number in phase noise and loop.Since the phase noise specifications for sampling local oscillation signal have been difficult to improve again, such as
Fruit cannot reduce the deterioration of the phase noise specifications of harmonic wave Sampling link, the wide-band microwave signal phase noise objective finally synthesized
Can not further improve.
Based on the purpose for reducing phase noise deterioration, obtaining higher phase noise specifications, relative to traditional scheme, the present invention
It is proposed a kind of low phase noise microwave local oscillation generating means and method, high-purity down coversion local oscillator group is mutually tied with low noise RF local oscillator
Close, using the wide-band microwave phase-lock technique of fundamental wave mixing, traditional microwave phase lock loop feedback loop section is improved：Wide-band microwave is anti-
After feedback signal is by signal conditioning circuit, the local oscillation signal of first wherein some suitable frequency with high-purity down coversion local oscillator group
Lower mixing is carried out, microwave oscillator feedback signal after the microwave frequency band of upper frequency is converted to the radio frequency band of lower frequency
It is mixed again with low noise RF local oscillator, so full fundamental wave mixing mode eliminates the frequency multiplication link originally in sampler,
So as to reduce the deterioration of phase noise in Microwave Phase -- Locked Loop loop, make the phase noise for further improving wide-band microwave local oscillator signal
Index is possibly realized.
The device of the invention and method are described in detail with reference to Figure of description.
As shown in Fig. 2, the low phase noise microwave local oscillation generating means of the present invention include：Low noise reference source 1, decimal point
Frequency phase locked loop 2, low noise RF local oscillator 3, high-purity down coversion local oscillator group 4, phase discriminator 5, low intermediate frequency signal modulate circuit 6, second
Frequency mixer 7, medium-and-high freuqncy signal modulate circuit 8, the first frequency mixer 9, loop integrator 10, wide-band microwave oscillator 11, broadband are micro-
Ripple signal conditioning circuit 12.
Relative to traditional circuit, hardware unit of the present invention has newly increased partial function circuit：I.e. low noise RF local oscillator 3,
High-purity down coversion local oscillator group 4, low intermediate frequency signal modulate circuit 6, the second frequency mixer 7, medium-and-high freuqncy signal modulate circuit 8, first are mixed
Frequency device 9 etc..
3 1~2.2GHz of frequency range of low noise RF local oscillator, nearly carrier wave end phase noise specifications are excellent, believe with high intermediate frequency
The low intermediate frequency signal that exports is suitable with fractional frequency-division phase-locked loop frequency range as reference after number mixing.
High-purity down coversion local oscillator group 4 includes high-purity local oscillator of 5 kinds of different frequencies altogether, by switching selection one of which and width
Band radiological feedback signal carries out down coversion, makes the intermediate-freuqncy signal after mixing suitable with the frequency range of low noise RF local oscillator 3.
Low intermediate frequency signal modulate circuit 6 realizes the filtering and amplification of low intermediate frequency signal.
Second frequency mixer 7 realizes high-purity down coversion local oscillator and is mixed under wide-band microwave signal that mixing output is believed for high intermediate frequency
Number.
Medium-and-high freuqncy signal modulate circuit 8 realizes the filtering and amplification of medium-and-high freuqncy signal.
First frequency mixer 9 realizes the mixing of low noise RF local oscillator and medium-and-high freuqncy signal, and mixing output is low intermediate frequency signal.
Frequency synthesis of the present invention tunes equation：
FO=FD+FIF1±FIF2
FIF2=FR
In above-mentioned formula, FOFor microwave oscillator frequency of oscillation, FDHigh-purity down coversion local frequency, FIF1For microwave oscillator and
High intermediate frequency after high-purity down coversion local oscillator mixing, FIF2For low noise RF local oscillator and medium-and-high freuqncy signal mixing after export it is low in
The frequency of frequency signal, FRThe phase demodulation reference frequency produced for fractional frequency division circuit.
Wide-band microwave signal frequency synthesis flow in the present invention includes：
Step 1：Reference source oscillating circuit working status is set, makes reference source working properly.
Step 2：Wide-band microwave combiner circuit phaselocked loop is set to be in open loop situations, it is preset according to the frequency of user setting
Wide-band microwave oscillator operating frequency FO。
Step 3：High-purity down coversion local oscillator group circuit working state is set, it is high-purity corresponding to be allowed to generation setting frequency point
Shake signal FD。
Step 4：Low noise RF local oscillator loop work state is set, is allowed to produce the corresponding low noise sheet of setting frequency point
Shake signal FS。
Step 5：The working status of fractional-N PLL circuit is set, is allowed to produce the corresponding low noise of setting frequency point
Reference signal FR。
Step 6：Predetermined stabilization time (such as 5ms) is set, makes low noise local oscillation signal FSWith fractional frequency division reference signal
FRWorking stability.
Step 7：Set wide-band microwave combiner circuit phaselocked loop be in closed loop states, wait the scheduled time to be placed (such as
10ms), wide-band microwave oscillator frequency F is madeOWorking stability.
For example, it is assumed that wide-band microwave oscillator operating frequency FOFor 4~9GHz, the frequency of oscillation of sampling local oscillator oscillating circuit
FSFor 300~600MHz, sampling intermediate frequency FIF1Frequency is 25~50MHz.During according to tradition sampling mode shown in Fig. 1, work as FO=
6GHz、FSDuring=503MHz,
According to FO-N*FS=± FIF
It can obtain, N=12, FIF=36MHz, meets the frequency range of setting.
In the frequency synthesis mode of sampling mixing, FSPhase noise at 10kHz frequency deviations is about -140dBc/Hz,
In theory, FOPhase noise at 10kHz frequency deviations is FSPhase noise+20lg N, i.e. -140dBc/ at 10kHz frequency deviations
Hz+20lg12dB≈-118.4dBc/Hz.That is the optimal finger of phase noise of the broadband phase-looked loop at 10kHz frequency deviations is assumed
Mark is -140dBc/Hz, and after the mixing of 10 sub-samplings, phase noise optimal index namely -120dBc/Hz.
When technical solution using the present invention, according to table 1：
Table 1
| Wide-band microwave feedback signal | High-purity down coversion local oscillator | Medium-and-high freuqncy signal | Fractional frequency-division phase-locked loop |
| 4~4.6GHz | 2.4GHz | 1.6~2.2GHz | 30~60MHz |
| 4.6~5.8GHz | 3.6GHz | 1.0~2.2GHz | 30~60MHz |
| 5.8~7.0GHz | 4.8GHz | 1.0~2.2GHz | 30~60MHz |
| 7.0~8.2GHz | 6.0GHz | 1.0~2.2GHz | 30~60MHz |
| 8.2~9GHz | 7.2GHz | 1.0~1.8GHz | 30~60MHz |
Work as FO=6GHz, if FDHigh-purity down coversion local oscillator working frequency is 4.8GHz, low noise RF local oscillator FSFor
1.233GHz, fractional frequency division reference signal FRFor 33MHz.Phase noise of high-purity down coversion local oscillator at 10kHz frequency deviations is about
For -132dBc/Hz, phase noise of the low noise RF local oscillator at 10kHz frequency deviations is about -136dBc/Hz, and fractional frequency division is joined
It is about -140dBc/Hz to examine phase noise of the signal at 10kHz frequency deviations, according to the frequency synthesis principle of such as Fig. 2, microwave lock
Phase noise is to transmit step by step in phase ring, and there is no 20lgN links.Wide-band microwave lock mutually exports the phase noise of signal in theory
The phase noise of worst phase noise, that is, high-purity local oscillator equal or close in loop, that is, work as FODuring=6GHz,
Phase noise at 10kHz frequency deviations is equal or close to -132dBc/Hz, than it is original use sampling mode when 10kHz frequency deviations at
Phase noise specifications can improve more than ten decibel.
The present invention is relative to the frequency synthesis mode of tradition sampling mixing it can be seen from above-mentioned calculating, the width after synthesis
Band microwave signal phase noise has larger improvement.
In phaselocked loop, since phase-locked loop acts on the noise of voltage controlled oscillator in high-pass filtering, and to reference and its
He acts on interior noise in low-pass filter.Therefore, the present invention can improve the noise in loop bandwidth, be wide-band microwave signal
The phase noise of (being usually 100kHz) within nearly carrier wave frequency deviation.
High-purity down coversion local oscillator group is respectively altogether including 5 kinds of high-purity local frequencies：2.4GHz、3.6GHz、4.8GHz、
6.0GHz and 7.2GHz, functional block diagram are as shown in Figure 3：
The high-purity local oscillators 21 of 4.8GHz come from low noise reference source.
Power divider 22 realizes the two paths of signals that high-purity local oscillator of 4.8GHz all the way is divided into equal-wattage, power distribution
Device 22 is printed board microstrip power divider.
Programmable frequency divider 23, which is realized, realizes input signal according to the frequency dividing ratio of programming setting the signal output after frequency dividing；
The programmable frequency divider 23 of the present invention, which can be realized, carries out 4.8GHz signals 1,2,3 or 4 frequency dividing, it is preferable that programmable point
Frequency device selects HMC905LP3E.
First single-pole double-throw switch (SPDT) 24 is realized the wherein signal gating all the way in two paths of signals, it is preferable that described first
Single-pole double-throw switch (SPDT) is HMC270MS8GE.
First hilted broadsword, four throw switch 25 is realized the wherein signal gating all the way in four road signals, it is preferable that described first
Four throw switch of hilted broadsword is HMC344LP3.
Three-mixer 26, which is realized, be mixed and then exports by two-way input signal, it is preferable that the frequency mixer is
SIM-153+。
1.2GHz bandpass filters 27 realize the narrow-band filtering that centre frequency is 1.2GHz, it is preferable that the 1.2GHz bands
Bandpass filter is printed board microstripline filter.
2.4GHz bandpass filters 28 realize the narrow-band filtering that centre frequency is 2.4GHz, it is preferable that the 2.4GHz bands
Bandpass filter 28 is printed board microstripline filter.
3.6GHz bandpass filters 29 realize the narrow-band filtering that centre frequency is 3.6GHz, the 3.6GHz bandpass filters
29 be printed board microstripline filter.
Second single-pole double-throw switch (SPDT) 210 is realized the wherein signal gating all the way in two paths of signals, it is preferable that the hilted broadsword
Commutator 210 is HMC270MS8GE.
Second hilted broadsword, four throw switch 211 is realized the wherein signal gating all the way in four road signals, it is preferable that the hilted broadsword
Four throw switches 211 are HMC344LP3
3rd hilted broadsword, four throw switch 212 is realized the wherein signal gating all the way in four road signals, the 3rd hilted broadsword four
Throw switch 212 is HMC344LP3.
The generation of the high-purity down coversion local oscillators of 2.4GHz is set：
The high-purity local oscillators of 4.8GHz from low noise reference source, divide for two-way, frequency programmable dividing by power divider 22
Device 23 sets two divided-frequency, sets two four throw switches 25 and 211 of hilted broadsword to choose 2.4GHz bandpass filters, then by single-pole double throw
Switch 210 and four throw switch 212 of hilted broadsword choose respective channel to export the high-purity local oscillators of 2.4GHz.
The generation of the high-purity down coversion local oscillators of 3.6GHz is set：
The high-purity local oscillators of 4.8GHz from low noise reference source, divide for two-way, frequency programmable dividing by power divider 22
Device 23 sets four frequency dividings, sets two four throw switches 25 and 211 of hilted broadsword to choose 3.6GHz bandpass filters, then by single-pole double throw
Switch 210 and four throw switch 212 of hilted broadsword choose respective channel to export the high-purity local oscillators of 3.6GHz.
The generation of the high-purity down coversion local oscillators of 4.8GHz is set：
The high-purity local oscillators of 4.8GHz from low noise reference source, divide for two-way, then by hilted broadsword by power divider 22
Commutator 24 and four throw switch 212 of hilted broadsword choose respective channel to export the high-purity local oscillators of 4.8GHz.
The generation of the high-purity down coversion local oscillators of 6.0GHz is set：
The high-purity local oscillators of 4.8GHz from low noise reference source, divide for two-way, frequency programmable dividing by power divider 22
Device 23 sets four frequency dividings, sets two four throw switches 25 and 211 of hilted broadsword to choose 1.2GHz bandpass filters, then by single-pole double throw
Switch 210 enters three-mixer 26；Set single-pole double-throw switch (SPDT) 24 to gate the signal path into three-mixer 26, set
The signal path that four throw switch 212 of hilted broadsword gating three-mixer 26 exports, output signal is the high-purity local oscillators of 6.0GHz.
The generation of the high-purity down coversion local oscillators of 7.2GHz is set：
The high-purity local oscillators of 4.8GHz from low noise reference source, divide for two-way, frequency programmable dividing by power divider 22
Device 23 sets two divided-frequency, sets two four throw switches 25 and 211 of hilted broadsword to choose 2.4GHz bandpass filters, then by single-pole double throw
Switch 210 enters three-mixer 26；Set single-pole double-throw switch (SPDT) 24 to gate the signal path into three-mixer 26, set
The signal path that four throw switch 212 of hilted broadsword gating three-mixer 26 exports, output signal is the high-purity local oscillators of 7.2GHz.
The present invention breaches legacy frequencies synthesis using the synthesis nearly Carrier Phase Noise of local oscillation signal in sampling frequency mixing method
The technical bottleneck restricted by sampling local oscillator noise, has the phase noise specifications of microwave synthesis local oscillation signal and further carries
It is high.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention god.
Claims (7)
- A kind of 1. low phase noise microwave local oscillation generating means, it is characterised in that including：Low noise reference source, fractional frequency division lock Xiang Huan, low noise RF local oscillator, high-purity down coversion local oscillator group, phase discriminator, low intermediate frequency signal modulate circuit, the second frequency mixer, height Intermediate-freuqncy signal modulate circuit, the first frequency mixer, loop integrator, wide-band microwave oscillator, wide-band microwave signal conditioning circuit；It is wide Band microwave oscillator feedback signal by wide-band microwave signal conditioning circuit after, first with high-purity down coversion local oscillator group wherein certain The local oscillation signal of one frequency carries out lower mixing, the microwave frequency band frequency conversion wide-band microwave oscillator feedback signal from upper frequency It is mixed again with low noise RF local oscillator after to the radio frequency band of lower frequency, is mixed the intermediate-freuqncy signal of output and comes from decimal The reference signal of frequency dividing phase-locked loop carries out phase demodulation, and phase demodulation exports the control that wide-band microwave oscillator is added to after loop integrator End, it is required low phase noise microwave local oscillation to make its output；The low intermediate frequency signal that low noise RF local oscillator exports after being mixed with medium-and-high freuqncy signal locks phase with fractional frequency division as reference Ring frequency range is suitable；High-purity down coversion local oscillator group includes high-purity local oscillator of 5 kinds of different frequencies, by switching selection one of which and wide-band microwave Feedback signal carries out down coversion, makes the intermediate-freuqncy signal after mixing suitable with the frequency range of low noise RF local oscillator；Low intermediate frequency signal modulate circuit realizes the filtering and amplification of low intermediate frequency signal；First frequency mixer realizes high-purity down coversion local oscillator and is mixed under wide-band microwave signal that mixing output is medium-and-high freuqncy signal；Medium-and-high freuqncy signal modulate circuit realizes the filtering and amplification of medium-and-high freuqncy signal；Second frequency mixer realizes the mixing of low noise RF local oscillator and medium-and-high freuqncy signal, and mixing output is low intermediate frequency signal；High-purity down coversion local oscillator group includes 5 kinds of high-purity local frequencies altogether, is respectively：2.4GHz、3.6GHz、4.8GHz、 6.0GHz and 7.2GHz；High-purity down coversion local oscillator group includes：The high-purity local oscillators of 4.8GHz (21), the high-purity local oscillators of 4.8GHz come from low noise reference source；High-purity local oscillator of 4.8GHz all the way is divided into the two paths of signals of equal-wattage by power divider (22)；Input signal is realized the signal output after frequency dividing by programmable frequency divider (23) according to the frequency dividing ratio of setting；First single-pole double-throw switch (SPDT) (24) is realized the wherein signal gating all the way in two paths of signals；First hilted broadsword, four throw switch (25) is realized the wherein signal gating all the way in four road signals；Three-mixer (26) realization exports after two-way input signal is mixed；1.2GHz bandpass filters (27) realize the narrow-band filtering that centre frequency is 1.2GHz；2.4GHz bandpass filters (28) realize the narrow-band filtering that centre frequency is 2.4GHz；3.6GHz bandpass filters (29) realize the narrow-band filtering that centre frequency is 3.6GHz；Second single-pole double-throw switch (SPDT) (210) is realized the wherein signal gating all the way in two paths of signals；Second hilted broadsword, four throw switch (211) is realized the wherein signal gating all the way in four road signals；3rd hilted broadsword, four throw switch (212) is realized the wherein signal gating all the way in four road signals.
- 2. low phase noise microwave local oscillation generating means as claimed in claim 1, it is characterised in that the high-purity down coversions of 2.4GHz The generation of local oscillator is set：The high-purity local oscillators of 4.8GHz (21) are divided into two-way by power divider (22), and programmable frequency divider (23) sets two points Frequently, four throw switch of the first hilted broadsword (25) and four throw switch of the second hilted broadsword (211) is set to choose 2.4GHz bandpass filters (28), then Respective channel is chosen to export high-purity of 2.4GHz by the second single-pole double-throw switch (SPDT) (210) and four throw switch of the 3rd hilted broadsword (212) Shake.
- 3. low phase noise microwave local oscillation generating means as claimed in claim 1, it is characterised in that the high-purity down coversions of 3.6GHz The generation of local oscillator is set：The high-purity local oscillators of 4.8GHz (21) are divided into two-way by power divider (22), and programmable frequency divider (23) sets four frequency dividings, Set four throw switch of the first hilted broadsword (25) and four throw switch of the second hilted broadsword (211) to choose 3.6GHz bandpass filters (29), then pass through Cross the second single-pole double-throw switch (SPDT) (210) and four throw switch of the 3rd hilted broadsword (212) chooses respective channel to export the high-purity local oscillators of 3.6GHz.
- 4. low phase noise microwave local oscillation generating means as claimed in claim 1, it is characterised in that the high-purity down coversions of 4.8GHz The generation of local oscillator is set：The high-purity local oscillators of 4.8GHz (21) are divided into two-way by power divider (22), then by the first single-pole double-throw switch (SPDT) (24) and 3rd hilted broadsword, four throw switch (212) chooses respective channel to export the high-purity local oscillators of 4.8GHz.
- 5. low phase noise microwave local oscillation generating means as claimed in claim 1, it is characterised in that the high-purity down coversions of 6.0GHz The generation of local oscillator is set：The high-purity local oscillators of 4.8GHz (21) are divided into two-way by power divider (22), and programmable frequency divider (23) sets four frequency dividings, Set four throw switch of the first hilted broadsword (25) and four throw switch of the second hilted broadsword (211) to choose 1.2GHz bandpass filters (27), then pass through Cross the second single-pole double-throw switch (SPDT) (210) and enter three-mixer (26)；The first single-pole double-throw switch (SPDT) (24) gating is set to enter the The signal path of three-mixer (26), sets the signal of four throw switch of the 3rd hilted broadsword (212) gating three-mixer (26) output Path, output signal is the high-purity local oscillators of 6.0GHz.
- 6. low phase noise microwave local oscillation generating means as claimed in claim 1, it is characterised in that the high-purity down coversions of 7.2GHz The generation of local oscillator is set：The high-purity local oscillators of 4.8GHz (21) are divided into two-way by power divider (22), and programmable frequency divider (23) sets two divided-frequency, Set four throw switch of the first hilted broadsword (25) and four throw switch of the second hilted broadsword (211) to choose 2.4GHz bandpass filters (28), then pass through Cross the second single-pole double-throw switch (SPDT) (210) and enter three-mixer (26)；The first single-pole double-throw switch (SPDT) (24) gating is set to enter the The signal path of three-mixer (26), sets the signal of four throw switch of the 3rd hilted broadsword (212) gating three-mixer (26) output Path, output signal is the high-purity local oscillators of 7.2GHz.
- 7. a kind of low phase noise microwave local oscillation generation method based on any one of claim 1 to 6 described device, its feature exist In comprising the following steps：Step 1：Reference source oscillating circuit working status is set, makes reference source working properly；Step 2：Wide-band microwave combiner circuit phaselocked loop is set to be in open loop situations, according to the frequency of user setting, preset broadband Microwave oscillator working frequency F0；Step 3：High-purity down coversion local oscillator group circuit working state is set, is allowed to produce the corresponding high-purity local oscillator letter of setting frequency point Number FD；Step 4：Low noise RF local oscillator loop work state is set, is allowed to produce the corresponding low noise local oscillator letter of setting frequency point Number FS；Step 5：The working status of fractional-N PLL circuit is set, is allowed to produce the corresponding low noise reference of setting frequency point Signal FR；Step 6：Predetermined stabilization time is set, makes low noise local oscillation signal FSWith fractional frequency division reference signal FRWorking stability；Step 7：Set wide-band microwave combiner circuit phaselocked loop to be in closed loop states, wait the scheduled time to be placed, make broadband micro- Wave oscillator frequency F0Working stability.
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| CN106849983A (en) * | 2017-02-13 | 2017-06-13 | 南京沁智电子科技有限公司 | A kind of millimeter wave transceiving component |
| CN107039883B (en) * | 2017-05-17 | 2019-01-29 | 浙江大学 | A kind of optical-electronic oscillator based on frequency-selecting of intermediate frequency |
| CN107332559B (en) * | 2017-06-09 | 2020-12-18 | 中国电子科技集团公司第四十一研究所 | Device and method for generating high-purity very high frequency signal |
| CN108418583B (en) * | 2018-03-20 | 2021-07-16 | 西安电子工程研究所 | Broadband fine stepping frequency agility frequency synthesis device and method based on cascade frequency mixing |
| CN109474275B (en) * | 2018-10-22 | 2022-06-07 | 北京无线电计量测试研究所 | Method and device for controlling frequency of hydrogen atom frequency scale microwave cavity |
| CN112688686B (en) * | 2020-12-14 | 2022-11-11 | 中电科思仪科技股份有限公司 | Miniaturized broadband frequency synthesizer |
| CN112737578A (en) * | 2020-12-25 | 2021-04-30 | 广州辰创科技发展有限公司 | High-phase-noise broadband microwave generation method, device and circuit |
| CN113852385B (en) * | 2021-10-20 | 2023-02-28 | 中电科思仪科技股份有限公司 | Method and system for optimizing phase noise of receiver |
| CN114401019B (en) * | 2021-11-29 | 2023-09-12 | 北京无线电计量测试研究所 | High-bandwidth high-sensitivity receiving front-end circuit |
| CN114264325B (en) * | 2021-12-15 | 2023-07-04 | 江南大学 | Multimode microwave detection system and method based on rapid frequency hopping technology |
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