CN105245224A - Low-phase noise microwave local oscillation generating device and method - Google Patents
Low-phase noise microwave local oscillation generating device and method Download PDFInfo
- Publication number
- CN105245224A CN105245224A CN201510764533.1A CN201510764533A CN105245224A CN 105245224 A CN105245224 A CN 105245224A CN 201510764533 A CN201510764533 A CN 201510764533A CN 105245224 A CN105245224 A CN 105245224A
- Authority
- CN
- China
- Prior art keywords
- frequency
- signal
- local oscillator
- purity
- microwave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention provides a low-phase noise microwave local oscillation generating device. After a broadband microwave oscillator feedback signal passes by a broadband microwave signal conditioning circuit, down mixing is carried out on the broadband microwave oscillator feedback signal and a local oscillation signal of a certain frequency of a high-purity down-conversion local oscillation group to convert the broadband microwave oscillator feedback signal from a microwave frequency band with higher frequency into a radio frequency band with lower frequency, and then the broadband microwave oscillator feedback signal is mixed with low-noise radio frequency local oscillation, phase discrimination is carried out on a mixed output middle frequency signal and a reference signal from a fractional frequency-division phase-locked loop, and a phase discrimination output is added to a control end of a broadband microwave oscillator after passing by a loop integrator, so that necessary low-phase noise microwave local oscillation is output. The low-phase noise microwave local oscillation generating device provided by the invention overcomes the technical bottleneck that in a sampling mixing method adopted in traditional frequency synthesis, near carrier phase nose for synthesizing the local oscillation signal is constrained by sampling local oscillation phase noise, and a phase noise index of the microwave synthesis local oscillation signal is further improved.
Description
Technical field
The present invention relates to technical field of measurement and test, particularly a kind of low phase noise microwave local oscillation generating apparatus, also 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, local oscillation circuit adopts many ring locks phase structure usually, as shown in Figure 1, traditional scheme generally comprises the link such as low noise reference source circuit, integer or fractional-N PLL circuit, low noise sampling local oscillation circuit, sampling mixting circuit, sampling intermediate frequency modulate circuit, phase discriminator, loop integrator, wide-band microwave oscillator, wide-band microwave signal conditioning circuit.
Low noise reference source circuit produces the reference signal of fractional-N PLL circuit and low noise sampling local oscillation circuit needs.
Fractional-N PLL circuit produces the phase demodulation reference signal needed for synthetic wideband microwave signal, and the minimum step frequency of reference signal 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 the key constraints of the nearly Carrier Phase Noise of synthetic wideband microwave signal.
The harmonic wave that sampling frequency mixer completes wide-band microwave signal and broadband sampling local oscillation signal carries out mixing, the sampling intermediate-freuqncy signal that output frequency is lower.
Sampling intermediate-freuqncy signal modulate circuit carries out filtering and amplification to the signal after sampling mixing output, the harmonic wave etc. of filtering wide-band microwave signal, broadband sampling local oscillation signal and sampling intermediate-freuqncy signal, and sampling intermediate-freuqncy signal is amplified to required power.
Phase discriminator completes the reference signal that fractional-N PLL circuit exports and the phase demodulation sampling intermediate-freuqncy signal.
Loop integrator realizes the anomalous integral filtering of phase discrimination signal, produces integral voltage, exports the locking that wide-band microwave oscillator realizes phase-locked loop to.
Wide-band microwave oscillator produces the wide-band microwave signal expected.
Wide-band microwave signal conditioning circuit realizes amplification and the filtering of wide-band microwave signal.
The local oscillator of low noise shown in Fig. 1 combiner circuit, the tuning equation of frequency synthesis is:
F
O-N*F
S＝±F
IF，F
IF＝F
R
In above formula, F
ofor microwave oscillator frequency of oscillation, F
sfor wideband low noise sampling local frequency, F
iFfor sampling IF-FRE, F
rfor the phase demodulation reference frequency that fractional frequency division circuit exports, N is sampling harmonic number.
Wide-band microwave oscillator, as yig tuned oscillator (YTO), usually has very wide operating frequency range and good carrier wave far-end phase noise, is widely used in the design of microwave signal generator or microwave local oscillator.
In the frequency synthesis mode of the mixing of sampling shown in Fig. 1, output signal F
ocarrier Phase Noise far away relies on oscillator self, and the phase noise of carrier wave near-end is limited to loop.Sampling local oscillator F
ssideband noise can directly be added on sampling intermediate frequency, and with the speed penalty of 20lgN (dB) (N be sample harmonic number).
Usually, local oscillator F is sampled
sfrequency is hundreds of MHz, is better than-140dBc/Hz at the phase noise specifications at frequency deviation 10kHz place.So high index has almost reached the limit of sampling local oscillator hardware circuit design.Therefore, F is limited to
sthe impact of sampling local oscillation signal phase noise, wide-band microwave signal F is improved again further in this scheme basis
ophase noise specifications very difficult.
Summary of the invention
The present invention proposes a kind of low phase noise microwave local oscillation generating apparatus and method, traditional microwave phase-locked loop structures is improved, evaded the harmonic wave Sampling mixing link worsening phase noise, the microwave local oscillation signal of more low phase noise can be obtained.
Technical scheme of the present invention is achieved in that
A kind of low phase noise microwave local oscillation generating apparatus, wide-band microwave oscillator feedback signal is by after wide-band microwave signal conditioning circuit, the local oscillation signal of wherein some frequencies of first and high-purity down-conversion local oscillator group carries out lower mixing, mixing is carried out with low noise radio-frequency (RF) local oscillator again wide-band microwave oscillator feedback signal is converted to the radio frequency band of lower frequency from the microwave frequency band of upper frequency after, the intermediate-freuqncy signal that mixing exports carries out phase demodulation with the reference signal from fractional frequency-division phase-locked loop, phase demodulation exports the control end being added to wide-band microwave oscillator after loop integrator, it is made to export as required low phase noise microwave local oscillation.
Alternatively, above-mentioned low phase noise microwave local oscillation generating apparatus, comprising: low noise reference source, fractional frequency-division phase-locked loop, low noise radio-frequency (RF) local oscillator, high-purity down-conversion local oscillator group, phase discriminator, low intermediate frequency signal modulate circuit, the second frequency mixer, high intermediate frequency signal conditioning circuit, the first frequency mixer, loop integrator, wide-band microwave oscillator, wide-band microwave signal conditioning circuit;
The low intermediate frequency signal exported after low noise radio-frequency (RF) local oscillator and high intermediate-freuqncy signal mixing is suitable with fractional frequency-division phase-locked loop frequency range as a reference;
High-purity down-conversion local oscillator group comprises high-purity local oscillator of 5 kinds of different frequencies, selects wherein a kind of and wide-band microwave feedback signal to carry out down-conversion, make the frequency range of the intermediate-freuqncy signal after mixing and low noise radio-frequency (RF) local oscillator suitable by switch;
Low intermediate frequency signal modulate circuit realizes filtering and the amplification of low intermediate frequency signal;
Second frequency mixer realizes mixing under high-purity down-conversion local oscillator and wide-band microwave signal, and mixing exports as high intermediate-freuqncy signal;
High intermediate frequency signal conditioning circuit realizes filtering and the amplification of high intermediate-freuqncy signal;
First frequency mixer realizes the mixing of low noise radio-frequency (RF) local oscillator and high intermediate-freuqncy signal, and mixing exports as low intermediate frequency signal.
Alternatively, described high-purity down-conversion local oscillator group comprises 5 kinds of high-purity local frequencies altogether, is respectively: 2.4GHz, 3.6GHz, 4.8GHz, 6.0GHz and 7.2GHz.
Alternatively, described high-purity down-conversion local oscillator group comprises:
The high-purity local oscillator 21 of 4.8GHz, the high-purity local oscillator of described 4.8GHz is from low noise reference source;
High-purity local oscillator of one road 4.8GHz is divided into the two paths of signals of equal-wattage by power divider 22;
Input signal is realized the signal after frequency division according to the frequency dividing ratio of setting and exports by programmable frequency divider 23;
First single-pole double-throw switch (SPDT) 24 realizes the wherein road signal gating in two paths of signals;
First hilted broadsword four throw switch 25 realizes the wherein road signal gating in four road signals;
Three-mixer 26 exports after realizing that two-way input signal is carried out mixing;
1.2GHz band pass filter 27 realizes the narrow-band filtering that centre frequency is 1.2GHz;
2.4GHz band pass filter 28 realizes the narrow-band filtering that centre frequency is 2.4GHz;
3.6GHz band pass filter 29 realizes the narrow-band filtering that centre frequency is 3.6GHz;
Second single-pole double-throw switch (SPDT) 210 realizes the wherein road signal gating in two paths of signals;
Second hilted broadsword four throw switch 211 realizes the wherein road signal gating in four road signals;
3rd hilted broadsword four throw switch 212 realizes the wherein road signal gating in four road signals.
Alternatively, the generation of the high-purity down-conversion local oscillator of 2.4GHz is arranged:
The high-purity local oscillator 21 of described 4.8GHz is divided into two-way through power divider 22, programmable frequency divider 23 arranges two divided-frequency, first hilted broadsword four throw switch 25 is set and the second hilted broadsword four throw switch 211 chooses 2.4GHz band pass filter 28, then chooses respective channel to export the high-purity local oscillator of 2.4GHz through the second single-pole double-throw switch (SPDT) 210 and the 3rd hilted broadsword four throw switch 212.
Alternatively, the generation of the high-purity down-conversion local oscillator of 3.6GHz is arranged:
The high-purity local oscillator 21 of 4.8GHz is divided into two-way through power divider 22, programmable frequency divider 23 arranges four frequency divisions, first hilted broadsword four throw switch 25 is set and the second hilted broadsword four throw switch 211 chooses 3.6GHz band pass filter 29, then chooses respective channel to export the high-purity local oscillator of 3.6GHz through the second single-pole double-throw switch (SPDT) 210 and the 3rd hilted broadsword four throw switch 212.
Alternatively, the generation of the high-purity down-conversion local oscillator of 4.8GHz is arranged:
The high-purity local oscillator 21 of 4.8GHz is divided into two-way through power divider 22, then chooses respective channel to export the high-purity local oscillator of 4.8GHz through the first single-pole double-throw switch (SPDT) 24 and the 3rd hilted broadsword four throw switch 212.
Alternatively, the generation of the high-purity down-conversion local oscillator of 6.0GHz is arranged:
The high-purity local oscillator 21 of 4.8GHz is divided into two-way through power divider 22, programmable frequency divider 23 arranges four frequency divisions, first hilted broadsword four throw switch 25 is set and the second hilted broadsword four throw switch 211 chooses 1.2GHz band pass filter 27, then enters three-mixer 26 through the second single-pole double-throw switch (SPDT) 210; Arrange the signal path that the first single-pole double-throw switch (SPDT) 24 gating enters three-mixer 26, arrange the signal path that the 3rd hilted broadsword four throw switch 212 gating three-mixer 26 exports, output signal is the high-purity local oscillator of 6.0GHz.
Alternatively, the generation of the high-purity down-conversion local oscillator of 7.2GHz is arranged:
The high-purity local oscillator 21 of 4.8GHz is divided into two-way through power divider 22, programmable frequency divider 23 arranges two divided-frequency, first hilted broadsword four throw switch 25 is set and the second hilted broadsword four throw switch 211 chooses 2.4GHz band pass filter 28, then enters three-mixer 26 through the second single-pole double-throw switch (SPDT) 210; Arrange the signal path that the first single-pole double-throw switch (SPDT) 24 gating enters three-mixer 26, arrange the signal path that the 3rd hilted broadsword four throw switch 212 gating three-mixer 26 exports, output signal is the high-purity local oscillator of 7.2GHz.
Based on said apparatus, the invention allows for a kind of low phase noise microwave local oscillation generation method, comprise the following steps:
Step one: reference source oscillating circuit operating state is set, makes reference source working properly;
Step 2: wide-band microwave combiner circuit phase-locked loop is set and is in open loop situations, according to the frequency that user is arranged, preset wide-band microwave oscillator operating frequency F
o;
Step 3: arrange high-purity down-conversion local oscillator group circuit working state, makes it to produce high-purity local oscillation signal F corresponding to setting frequency
d;
Step 4: arrange low noise radio-frequency (RF) local oscillator loop work state, makes it to produce low noise local oscillation signal F corresponding to setting frequency
s;
Step 5: the operating state arranging fractional-N PLL circuit, makes it to produce low noise reference signal F corresponding to setting frequency
r;
Step 6: arrange predetermined stabilization time, makes low noise local oscillation signal F
swith fractional frequency division reference signal F
rworking stability;
Step 7: wide-band microwave combiner circuit phase-locked loop is set and is in closed loop states, wait the scheduled time to be placed, make wide-band microwave oscillator frequency F
oworking stability.
The invention has the beneficial effects as follows:
Breach in legacy frequencies synthesis employing sampling frequency mixing method and synthesize the technical bottleneck of the nearly Carrier Phase Noise of local oscillation signal by the restriction of sampling local oscillator noise, make the phase noise specifications of Microwave synthesize local oscillation signal have further raising.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is existing low noise local oscillator composition principle block diagram;
Fig. 2 is local oscillator composition principle block diagram of the present invention;
Fig. 3 is high-purity down-conversion local oscillator group theory diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The nearly Carrier Phase Noise of the wideband low noise frequency combining method of current employing is limited to harmonic wave Sampling number of times in the phase noise and loop sampling local oscillation signal.Because the phase noise specifications sampling local oscillation signal has been difficult to improve again, if the deterioration of the phase noise specifications of harmonic wave Sampling link can not be reduced, cannot improving further of the final wide-band microwave signal phase noise objective synthesized.
Worsen based on minimizing phase noise, obtain the object of higher phase noise specifications, relative to traditional scheme, the present invention proposes a kind of low phase noise microwave local oscillation generating apparatus and method, high-purity down-conversion local oscillator group combines with low noise radio-frequency (RF) local oscillator, adopt the wide-band microwave phase-lock technique of fundamental wave mixing, traditional microwave phase lock loop feedback loop joint is improved: wide-band microwave feedback signal is by after signal conditioning circuit, the local oscillation signal of wherein some suitable frequency of first and high-purity down-conversion local oscillator group carries out lower mixing, mixing is carried out with low noise radio-frequency (RF) local oscillator again microwave oscillator feedback signal is converted to the radio frequency band of lower frequency from the microwave frequency band of upper frequency after, so full fundamental wave mixing mode eliminates original frequency multiplication link in sampler, thus reduce the deterioration of phase noise in Microwave Phase--Locked Loop loop, the phase noise specifications improving wide-band microwave local oscillator signal is further made to become possibility.
Below in conjunction with Figure of description, device and method of the present invention is described in detail.
As shown in Figure 2, low phase noise microwave local oscillation generating apparatus of the present invention comprises: low noise reference source 1, fractional frequency-division phase-locked loop 2, low noise radio-frequency (RF) local oscillator 3, high-purity down-conversion local oscillator group 4, phase discriminator 5, low intermediate frequency signal modulate circuit 6, second frequency mixer 7, high intermediate frequency signal conditioning circuit 8, first frequency mixer 9, loop integrator 10, wide-band microwave oscillator 11, wide-band microwave signal conditioning circuit 12.
Relative to traditional circuit, hardware unit of the present invention has newly increased partial function circuit: i.e. low noise radio-frequency (RF) local oscillator 3, high-purity down-conversion local oscillator group 4, low intermediate frequency signal modulate circuit 6, second frequency mixer 7, high intermediate frequency signal conditioning circuit 8, first frequency mixer 9 etc.
Low noise radio-frequency (RF) local oscillator 3 frequency range 1 ~ 2.2GHz, nearly carrier wave end phase noise specifications is excellent, suitable with fractional frequency-division phase-locked loop frequency range as a reference with the low intermediate frequency signal exported after high intermediate-freuqncy signal mixing.
High-purity down-conversion local oscillator group 4 comprises high-purity local oscillator of 5 kinds of different frequencies altogether, selects wherein a kind of and wide-band microwave feedback signal to carry out down-conversion, make the frequency range of the intermediate-freuqncy signal after mixing and low noise radio-frequency (RF) local oscillator 3 suitable by switch.
Low intermediate frequency signal modulate circuit 6 realizes filtering and the amplification of low intermediate frequency signal.
Second frequency mixer 7 realizes mixing under high-purity down-conversion local oscillator and wide-band microwave signal, and mixing exports as high intermediate-freuqncy signal.
High intermediate frequency signal conditioning circuit 8 realizes filtering and the amplification of high intermediate-freuqncy signal.
First frequency mixer 9 realizes the mixing of low noise radio-frequency (RF) local oscillator and high intermediate-freuqncy signal, and mixing exports as low intermediate frequency signal.
The tuning equation of frequency synthesis of the present invention is:
F
O＝F
D+F
IF1±F
IF2
F
IF2＝F
R
In above-mentioned formula, F
ofor microwave oscillator frequency of oscillation, F
dhigh-purity down-conversion local frequency, F
iF1for the high intermediate frequency after microwave oscillator and the mixing of high-purity down-conversion local oscillator, F
iF2for the frequency of low intermediate frequency signal exported after low noise radio-frequency (RF) local oscillator and high intermediate-freuqncy signal mixing, F
rfor the phase demodulation reference frequency that fractional frequency division circuit produces.
Wide-band microwave signal frequency synthesis flow in the present invention comprises:
Step one: reference source oscillating circuit operating state is set, makes reference source working properly.
Step 2: wide-band microwave combiner circuit phase-locked loop is set and is in open loop situations, according to the frequency that user is arranged, preset wide-band microwave oscillator operating frequency F
o.
Step 3: arrange high-purity down-conversion local oscillator group circuit working state, makes it to produce high-purity local oscillation signal F corresponding to setting frequency
d.
Step 4: arrange low noise radio-frequency (RF) local oscillator loop work state, makes it to produce low noise local oscillation signal F corresponding to setting frequency
s.
Step 5: the operating state arranging fractional-N PLL circuit, makes it to produce low noise reference signal F corresponding to setting frequency
r.
Step 6: arrange predetermined stabilization time (such as 5ms), makes low noise local oscillation signal F
swith fractional frequency division reference signal F
rworking stability.
Step 7: arrange wide-band microwave combiner circuit phase-locked loop and be in closed loop states, waits the scheduled time (such as 10ms) to be placed, makes wide-band microwave oscillator frequency F
oworking stability.
Such as, wide-band microwave oscillator operating frequency F is supposed
obe 4 ~ 9GHz, the frequency of oscillation F of sampling local oscillator oscillating circuit
sbe 300 ~ 600MHz, sampling intermediate frequency F
iF1frequency is 25 ~ 50MHz.During according to traditional sampling mode shown in Fig. 1, work as F
o=6GHz, F
sduring=503MHz,
According to F
o-N*F
s=± F
iF
Can obtain, N=12, F
iF=36MHz, meets the frequency range of setting.
In the frequency synthesis mode of sampling mixing, F
s-140dBc/Hz is approximately at the phase noise at 10kHz frequency deviation place, in theory, F
obe F at the phase noise at 10kHz frequency deviation place
sat the phase noise+20lgN at 10kHz frequency deviation place, i.e.-140dBc/Hz+20lg12dB ≈-118.4dBc/Hz.That is suppose that the optimum index of the phase noise of broadband phase-looked loop at 10kHz frequency deviation place is-140dBc/Hz, and after 10 sub-sampling mixing, the optimum index of phase noise namely-120dBc/Hz.
When adopting technical scheme of the present invention, known according to table 1:
Table 1
| Wide-band microwave feedback signal | High-purity down-conversion local oscillator | High intermediate-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 F
o=6GHz, if F
dhigh-purity down-conversion local oscillator operating frequency is 4.8GHz, low noise radio-frequency (RF) local oscillator F
sfor 1.233GHz, fractional frequency division reference signal F
rfor 33MHz.High-purity down-conversion local oscillator is approximately-132dBc/Hz at the phase noise at 10kHz frequency deviation place, low noise radio-frequency (RF) local oscillator is approximately-136dBc/Hz at the phase noise at 10kHz frequency deviation place, fractional frequency division reference signal is approximately-140dBc/Hz at the phase noise at 10kHz frequency deviation place, according to the frequency synthesis principle of such as Fig. 2, in Microwave Phase--Locked Loop, phase noise transmits step by step, there is not 20lgN link.The phase noise of the phase-locked output signal of wide-band microwave equals or close to the phase noise of phase noise the poorest in loop and high-purity local oscillator, namely works as F in theory
oduring=6GHz, the phase noise at 10kHz frequency deviation place equals or close-132dBc/Hz, can improve tens decibels than the phase noise specifications at 10kHz frequency deviation place during original employing sampling mode.
As can be seen from above-mentioned calculating, the present invention is relative to the frequency synthesis mode of tradition sampling mixing, and the wide-band microwave signal phase noise after synthesis has larger improvement.
In phase-locked loop, because the noise of phase-locked loop to voltage controlled oscillator is high-pass filtering effect, and be low-pass filter effect to the noise in reference and other bands.Therefore, the present invention can improve the noise in loop bandwidth, is the phase noise of (being generally 100kHz) within the nearly carrier wave frequency deviation of wide-band microwave signal.
High-purity down-conversion local oscillator group comprises 5 kinds of high-purity local frequencies altogether and is respectively: 2.4GHz, 3.6GHz, 4.8GHz, 6.0GHz and 7.2GHz, theory diagram as shown in Figure 3:
The high-purity local oscillator 21 of 4.8GHz is from low noise reference source.
Power divider 22 realizes the two paths of signals high-purity local oscillator of a road 4.8GHz being divided into equal-wattage, and power divider 22 is printed board microstrip power divider.
Programmable frequency divider 23 realizes that input signal is realized the signal after frequency division according to the frequency dividing ratio of programming setting and exports; Programmable frequency divider 23 of the present invention can realize carrying out 1,2,3 or 4 frequency division to 4.8GHz signal, and preferably, programmable frequency divider selects HMC905LP3E.
First single-pole double-throw switch (SPDT) 24 realizes the wherein road signal gating in two paths of signals, and preferably, described first single-pole double-throw switch (SPDT) is HMC270MS8GE.
First hilted broadsword four throw switch 25 realizes the wherein road signal gating in four road signals, and preferably, described first hilted broadsword four throw switch is HMC344LP3.
Three-mixer 26 realizes that two-way input signal is carried out mixing and then exports, and preferably, described frequency mixer is SIM-153+.
1.2GHz band pass filter 27 realizes the narrow-band filtering that centre frequency is 1.2GHz, and preferably, described 1.2GHz band pass filter is printed board microstripline filter.
2.4GHz band pass filter 28 realizes the narrow-band filtering that centre frequency is 2.4GHz, and preferably, described 2.4GHz band pass filter 28 is printed board microstripline filter.
3.6GHz band pass filter 29 realizes the narrow-band filtering that centre frequency is 3.6GHz, and described 3.6GHz band pass filter 29 is printed board microstripline filter.
Second single-pole double-throw switch (SPDT) 210 realizes the wherein road signal gating in two paths of signals, and preferably, described single-pole double-throw switch (SPDT) 210 is HMC270MS8GE.
Second hilted broadsword four throw switch 211 realizes the wherein road signal gating in four road signals, and preferably, described hilted broadsword four throw switch 211 is HMC344LP3
3rd hilted broadsword four throw switch 212 realizes the wherein road signal gating in four road signals, and described 3rd hilted broadsword four throw switch 212 is HMC344LP3.
The generation of the high-purity down-conversion local oscillator of 2.4GHz is arranged:
The high-purity local oscillator of 4.8GHz from low noise reference source, two-way is divided into through power divider 22, programmable frequency divider 23 arranges two divided-frequency, two hilted broadsword four throw switches 25 and 211 are set and choose 2.4GHz band pass filter, then choose respective channel to export the high-purity local oscillator of 2.4GHz through single-pole double-throw switch (SPDT) 210 and hilted broadsword four throw switch 212.
The generation of the high-purity down-conversion local oscillator of 3.6GHz is arranged:
The high-purity local oscillator of 4.8GHz from low noise reference source, two-way is divided into through power divider 22, programmable frequency divider 23 arranges four frequency divisions, two hilted broadsword four throw switches 25 and 211 are set and choose 3.6GHz band pass filter, then choose respective channel to export the high-purity local oscillator of 3.6GHz through single-pole double-throw switch (SPDT) 210 and hilted broadsword four throw switch 212.
The generation of the high-purity down-conversion local oscillator of 4.8GHz is arranged:
The high-purity local oscillator of 4.8GHz from low noise reference source, is divided into two-way through power divider 22, then chooses respective channel to export the high-purity local oscillator of 4.8GHz through single-pole double-throw switch (SPDT) 24 and hilted broadsword four throw switch 212.
The generation of the high-purity down-conversion local oscillator of 6.0GHz is arranged:
The high-purity local oscillator of 4.8GHz from low noise reference source, two-way is divided into through power divider 22, programmable frequency divider 23 arranges four frequency divisions, arranges two hilted broadsword four throw switches 25 and 211 and chooses 1.2GHz band pass filter, then enter three-mixer 26 through single-pole double-throw switch (SPDT) 210; Arrange the signal path that single-pole double-throw switch (SPDT) 24 gating enters three-mixer 26, arrange the signal path that hilted broadsword four throw switch 212 gating three-mixer 26 exports, output signal is the high-purity local oscillator of 6.0GHz.
The generation of the high-purity down-conversion local oscillator of 7.2GHz is arranged:
The high-purity local oscillator of 4.8GHz from low noise reference source, two-way is divided into through power divider 22, programmable frequency divider 23 arranges two divided-frequency, arranges two hilted broadsword four throw switches 25 and 211 and chooses 2.4GHz band pass filter, then enter three-mixer 26 through single-pole double-throw switch (SPDT) 210; Arrange the signal path that single-pole double-throw switch (SPDT) 24 gating enters three-mixer 26, arrange the signal path that hilted broadsword four throw switch 212 gating three-mixer 26 exports, output signal is the high-purity local oscillator of 7.2GHz.
The present invention breaches in legacy frequencies synthesis employing sampling frequency mixing method and synthesizes the technical bottleneck of the nearly Carrier Phase Noise of local oscillation signal by the restriction of sampling local oscillator noise, makes the phase noise specifications of Microwave synthesize local oscillation signal have further raising.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a low phase noise microwave local oscillation generating apparatus, it is characterized in that, wide-band microwave oscillator feedback signal is by after wide-band microwave signal conditioning circuit, the local oscillation signal of wherein some frequencies of first and high-purity down-conversion local oscillator group carries out lower mixing, mixing is carried out with low noise radio-frequency (RF) local oscillator again wide-band microwave oscillator feedback signal is converted to the radio frequency band of lower frequency from the microwave frequency band of upper frequency after, the intermediate-freuqncy signal that mixing exports carries out phase demodulation with the reference signal from fractional frequency-division phase-locked loop, phase demodulation exports the control end being added to wide-band microwave oscillator after loop integrator, it is made to export as required low phase noise microwave local oscillation.
2. low phase noise microwave local oscillation generating apparatus as claimed in claim 1, it is characterized in that, comprising: low noise reference source, fractional frequency-division phase-locked loop, low noise radio-frequency (RF) local oscillator, high-purity down-conversion local oscillator group, phase discriminator, low intermediate frequency signal modulate circuit, the second frequency mixer, high intermediate frequency signal conditioning circuit, the first frequency mixer, loop integrator, wide-band microwave oscillator, wide-band microwave signal conditioning circuit;
The low intermediate frequency signal exported after low noise radio-frequency (RF) local oscillator and high intermediate-freuqncy signal mixing is suitable with fractional frequency-division phase-locked loop frequency range as a reference;
High-purity down-conversion local oscillator group comprises high-purity local oscillator of 5 kinds of different frequencies, selects wherein a kind of and wide-band microwave feedback signal to carry out down-conversion, make the frequency range of the intermediate-freuqncy signal after mixing and low noise radio-frequency (RF) local oscillator suitable by switch;
Low intermediate frequency signal modulate circuit realizes filtering and the amplification of low intermediate frequency signal;
Second frequency mixer realizes mixing under high-purity down-conversion local oscillator and wide-band microwave signal, and mixing exports as high intermediate-freuqncy signal;
High intermediate frequency signal conditioning circuit realizes filtering and the amplification of high intermediate-freuqncy signal;
First frequency mixer realizes the mixing of low noise radio-frequency (RF) local oscillator and high intermediate-freuqncy signal, and mixing exports as low intermediate frequency signal.
3. low phase noise microwave local oscillation generating apparatus as claimed in claim 2, it is characterized in that, described high-purity down-conversion local oscillator group comprises 5 kinds of high-purity local frequencies altogether, is respectively: 2.4GHz, 3.6GHz, 4.8GHz, 6.0GHz and 7.2GHz.
4. low phase noise microwave local oscillation generating apparatus as claimed in claim 3, it is characterized in that, described high-purity down-conversion local oscillator group comprises:
The high-purity local oscillator of 4.8GHz (21), the high-purity local oscillator of described 4.8GHz is from low noise reference source;
High-purity local oscillator of one road 4.8GHz is divided into the two paths of signals of equal-wattage by power divider (22);
Input signal is realized the signal after frequency division according to the frequency dividing ratio of setting and exports by programmable frequency divider (23);
First single-pole double-throw switch (SPDT) (24) realizes the wherein road signal gating in two paths of signals;
First hilted broadsword four throw switch (25) realizes the wherein road signal gating in four road signals;
Three-mixer (26) exports after realizing that two-way input signal is carried out mixing;
1.2GHz band pass filter (27) realizes the narrow-band filtering that centre frequency is 1.2GHz;
2.4GHz band pass filter (28) realizes the narrow-band filtering that centre frequency is 2.4GHz;
3.6GHz band pass filter (29) realizes the narrow-band filtering that centre frequency is 3.6GHz;
Second single-pole double-throw switch (SPDT) (210) realizes the wherein road signal gating in two paths of signals;
Second hilted broadsword four throw switch (211) realizes the wherein road signal gating in four road signals;
3rd hilted broadsword four throw switch (212) realizes the wherein road signal gating in four road signals.
5. low phase noise microwave local oscillation generating apparatus as claimed in claim 4, is characterized in that, the generation of the high-purity down-conversion local oscillator of 2.4GHz is arranged:
The high-purity local oscillator of described 4.8GHz (21) is divided into two-way through power divider (22), programmable frequency divider (23) arranges two divided-frequency, first hilted broadsword four throw switch (25) is set and the second hilted broadsword four throw switch (211) chooses 2.4GHz band pass filter (28), then chooses respective channel to export the high-purity local oscillator of 2.4GHz through the second single-pole double-throw switch (SPDT) (210) and the 3rd hilted broadsword four throw switch (212).
6. low phase noise microwave local oscillation generating apparatus as claimed in claim 4, is characterized in that, the generation of the high-purity down-conversion local oscillator of 3.6GHz is arranged:
The high-purity local oscillator of 4.8GHz (21) is divided into two-way through power divider (22), programmable frequency divider (23) arranges four frequency divisions, first hilted broadsword four throw switch (25) is set and the second hilted broadsword four throw switch (211) chooses 3.6GHz band pass filter (29), then chooses respective channel to export the high-purity local oscillator of 3.6GHz through the second single-pole double-throw switch (SPDT) (210) and the 3rd hilted broadsword four throw switch (212).
7. low phase noise microwave local oscillation generating apparatus as claimed in claim 4, is characterized in that, the generation of the high-purity down-conversion local oscillator of 4.8GHz is arranged:
The high-purity local oscillator of 4.8GHz (21) is divided into two-way through power divider (22), then chooses respective channel to export the high-purity local oscillator of 4.8GHz through the first single-pole double-throw switch (SPDT) (24) and the 3rd hilted broadsword four throw switch (212).
8. low phase noise microwave local oscillation generating apparatus as claimed in claim 4, is characterized in that, the generation of the high-purity down-conversion local oscillator of 6.0GHz is arranged:
The high-purity local oscillator of 4.8GHz (21) is divided into two-way through power divider (22), programmable frequency divider (23) arranges four frequency divisions, first hilted broadsword four throw switch (25) is set and the second hilted broadsword four throw switch (211) chooses 1.2GHz band pass filter (27), then enters three-mixer (26) through the second single-pole double-throw switch (SPDT) (210); The signal path that first single-pole double-throw switch (SPDT) (24) gating enters three-mixer (26) is set, arrange the signal path that the 3rd hilted broadsword four throw switch (212) gating three-mixer (26) exports, output signal is the high-purity local oscillator of 6.0GHz.
9. low phase noise microwave local oscillation generating apparatus as claimed in claim 4, is characterized in that, the generation of the high-purity down-conversion local oscillator of 7.2GHz is arranged:
The high-purity local oscillator of 4.8GHz (21) is divided into two-way through power divider (22), programmable frequency divider (23) arranges two divided-frequency, first hilted broadsword four throw switch (25) is set and the second hilted broadsword four throw switch (211) chooses 2.4GHz band pass filter (28), then enters three-mixer (26) through the second single-pole double-throw switch (SPDT) (210); The signal path that first single-pole double-throw switch (SPDT) (24) gating enters three-mixer (26) is set, arrange the signal path that the 3rd hilted broadsword four throw switch (212) gating three-mixer (26) exports, output signal is the high-purity local oscillator of 7.2GHz.
10. one kind based on the low phase noise microwave local oscillation generation method of device described in any one of claim 1 to 9, it is characterized in that, comprises the following steps:
Step one: reference source oscillating circuit operating state is set, makes reference source working properly;
Step 2: wide-band microwave combiner circuit phase-locked loop is set and is in open loop situations, according to the frequency that user is arranged, preset wide-band microwave oscillator operating frequency F
o;
Step 3: arrange high-purity down-conversion local oscillator group circuit working state, makes it to produce high-purity local oscillation signal F corresponding to setting frequency
d;
Step 4: arrange low noise radio-frequency (RF) local oscillator loop work state, makes it to produce low noise local oscillation signal F corresponding to setting frequency
s;
Step 5: the operating state arranging fractional-N PLL circuit, makes it to produce low noise reference signal F corresponding to setting frequency
r;
Step 6: arrange predetermined stabilization time, makes low noise local oscillation signal F
swith fractional frequency division reference signal F
rworking stability;
Step 7: wide-band microwave combiner circuit phase-locked loop is set and is in closed loop states, wait the scheduled time to be placed, make wide-band microwave oscillator frequency F
oworking stability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510764533.1A CN105245224B (en) | 2015-11-05 | 2015-11-05 | A kind of low phase noise microwave local oscillation generating means and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510764533.1A CN105245224B (en) | 2015-11-05 | 2015-11-05 | A kind of low phase noise microwave local oscillation generating means and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105245224A true CN105245224A (en) | 2016-01-13 |
| CN105245224B CN105245224B (en) | 2018-04-24 |
Family
ID=55042747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510764533.1A Active CN105245224B (en) | 2015-11-05 | 2015-11-05 | A kind of low phase noise microwave local oscillation generating means and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105245224B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385255A (en) * | 2016-08-17 | 2017-02-08 | 中国电子科技集团公司第四十研究所 | Low-noise high-definition tunable multi-loop frequency synthesizing device and method |
| 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 |
| CN107039883A (en) * | 2017-05-17 | 2017-08-11 | 浙江大学 | A kind of optical-electronic oscillator based on frequency-selecting of intermediate frequency |
| CN107332559A (en) * | 2017-06-09 | 2017-11-07 | 中国电子科技集团公司第四十研究所 | A kind of generating means and method of high-purity very high frequency(VHF) signal |
| CN108418583A (en) * | 2018-03-20 | 2018-08-17 | 西安电子工程研究所 | The thin stepping frequency agility apparatus for frequency synthesizing in broadband and method based on cascade mixing |
| CN109474275A (en) * | 2018-10-22 | 2019-03-15 | 北京无线电计量测试研究所 | A kind of Hydrogen Atom Frequency Standard microwave cavity control method for frequency and device |
| CN112688686A (en) * | 2020-12-14 | 2021-04-20 | 中电科仪器仪表有限公司 | Miniaturized broadband frequency synthesizer |
| CN113852385A (en) * | 2021-10-20 | 2021-12-28 | 中电科思仪科技股份有限公司 | Method and system for optimizing phase noise of receiver |
| CN114264325A (en) * | 2021-12-15 | 2022-04-01 | 江南大学 | Multimode microwave detection system and method based on rapid frequency hopping technology |
| CN114401019A (en) * | 2021-11-29 | 2022-04-26 | 北京无线电计量测试研究所 | Large-bandwidth high-sensitivity receiving front-end circuit |
| CN115701888A (en) * | 2023-01-05 | 2023-02-14 | 成都鸿启兴电子科技有限公司 | Microwave frequency source and microwave equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2562508Y (en) * | 2002-08-23 | 2003-07-23 | 信息产业部电子第五十四研究所 | Microwave wide-band low-noise frequency synthesizer |
| US20040087293A1 (en) * | 2002-11-04 | 2004-05-06 | Rolf Jaehne | Automatic center frequency tuning of a voltage controlled oscillator |
| CN103595406A (en) * | 2013-10-24 | 2014-02-19 | 中国电子科技集团公司第四十一研究所 | Broadband microwave signal low-phase noise synthesizing device and method |
-
2015
- 2015-11-05 CN CN201510764533.1A patent/CN105245224B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2562508Y (en) * | 2002-08-23 | 2003-07-23 | 信息产业部电子第五十四研究所 | Microwave wide-band low-noise frequency synthesizer |
| US20040087293A1 (en) * | 2002-11-04 | 2004-05-06 | Rolf Jaehne | Automatic center frequency tuning of a voltage controlled oscillator |
| CN103595406A (en) * | 2013-10-24 | 2014-02-19 | 中国电子科技集团公司第四十一研究所 | Broadband microwave signal low-phase noise synthesizing device and method |
Non-Patent Citations (1)
| Title |
|---|
| 杨东营等: "基于宽带VCO的低相位噪声锁相环设计", 《2015年全国微波毫米波会议论文集》 * |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385255B (en) * | 2016-08-17 | 2019-07-26 | 中国电子科技集团公司第四十一研究所 | A kind of polycyclic apparatus for frequency synthesizing that low noise high-resolution is tunable and method |
| CN106385255A (en) * | 2016-08-17 | 2017-02-08 | 中国电子科技集团公司第四十研究所 | Low-noise high-definition tunable multi-loop frequency synthesizing device and method |
| 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 |
| CN107039883A (en) * | 2017-05-17 | 2017-08-11 | 浙江大学 | A kind of optical-electronic oscillator based on frequency-selecting of intermediate frequency |
| 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 |
| CN107332559A (en) * | 2017-06-09 | 2017-11-07 | 中国电子科技集团公司第四十研究所 | A kind of generating means and method of high-purity very high frequency(VHF) signal |
| 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 |
| CN108418583A (en) * | 2018-03-20 | 2018-08-17 | 西安电子工程研究所 | The thin stepping frequency agility apparatus for frequency synthesizing in broadband and method based on cascade mixing |
| 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 |
| CN109474275A (en) * | 2018-10-22 | 2019-03-15 | 北京无线电计量测试研究所 | A kind of Hydrogen Atom Frequency Standard microwave cavity control method for frequency and device |
| 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 |
| CN112688686A (en) * | 2020-12-14 | 2021-04-20 | 中电科仪器仪表有限公司 | Miniaturized broadband frequency synthesizer |
| CN113852385A (en) * | 2021-10-20 | 2021-12-28 | 中电科思仪科技股份有限公司 | Method and system for optimizing phase noise of receiver |
| CN114401019A (en) * | 2021-11-29 | 2022-04-26 | 北京无线电计量测试研究所 | Large-bandwidth high-sensitivity receiving front-end circuit |
| 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 |
| CN114264325A (en) * | 2021-12-15 | 2022-04-01 | 江南大学 | Multimode microwave detection system and method based on rapid frequency hopping technology |
| CN115701888A (en) * | 2023-01-05 | 2023-02-14 | 成都鸿启兴电子科技有限公司 | Microwave frequency source and microwave equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105245224B (en) | 2018-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105245224A (en) | Low-phase noise microwave local oscillation generating device and method | |
| CN102651649B (en) | Design method of low-phase-noise microwave wideband frequency combiner | |
| CN103595406B (en) | A kind of device and method of wide-band microwave signal low phase noise synthesis | |
| CN105187059B (en) | A kind of broadband Low phase noise local frequency combiner circuit and method | |
| CN105141310B (en) | Polycyclic broadband low phase noise frequency synthesizer | |
| CN105071804B (en) | A kind of Low phase noise broadband microwave local oscillator source circuit and its implementation method | |
| CN103607215B (en) | A kind of apparatus and method realizing spectrum analyzer spread spectrum function | |
| CN103762978A (en) | Broadband low-phase noise frequency synthesizer without frequency divider based on harmonic mixing | |
| CN105553469A (en) | Low-phase noise frequency source | |
| Rong et al. | A 0.05-to 10-GHz, 19-to 22-GHz, and 38-to 44-GHz Frequency Synthesizer for Software-Defined Radios in 0.13-$\mu\mbox {m} $ CMOS Process | |
| CN115842549B (en) | Frequency synthesizer | |
| CN109450445A (en) | A kind of variable loop bandwidth frequency synthesizer, system and method | |
| CN110166048A (en) | A kind of Novel ultra wide band Low phase noise frequency source | |
| CN117081583B (en) | Frequency source for improving phase noise | |
| CN114070307A (en) | Broadband fast switching frequency synthesis circuit | |
| CN107834998B (en) | A kind of broadband orthogonal signalling generation device | |
| CN107196653B (en) | Broadband low-phase noise frequency synthesizer | |
| CN105356878B (en) | A kind of implementation method and device of improved tricyclic wideband frequency synthesizer | |
| CN103634024B (en) | A kind of apparatus and method realizing signal analysis instrument spread spectrum function | |
| CN103607200B (en) | A kind of low-converter for electronic measuring instrument and down conversion method | |
| CN210041797U (en) | Novel ultra-wideband low-phase-noise frequency source | |
| CN104779918B (en) | X Ka frequency ranges upconverter and its up-conversion method | |
| Regev et al. | A robust reconfigurable front-end for non-contiguous multi-channel carrier aggregation receivers | |
| CN105245225B (en) | Low-frequency range arrowband synthetic source is converted into the circuit of high-frequency-band broadband synthetic source | |
| CN203596813U (en) | Low-phase-noise frequency synthesizer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |