CN204231328U - A kind of star is with frequently combining source - Google Patents

A kind of star is with frequently combining source Download PDF

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Publication number
CN204231328U
CN204231328U CN201420302194.6U CN201420302194U CN204231328U CN 204231328 U CN204231328 U CN 204231328U CN 201420302194 U CN201420302194 U CN 201420302194U CN 204231328 U CN204231328 U CN 204231328U
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China
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frequency
filter
signal
frequency multipliers
multipliers
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CN201420302194.6U
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徐建华
罗运生
周明
汪宇
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CETC 55 Research Institute
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CETC 55 Research Institute
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Abstract

The utility model discloses a kind of star and frequently combine source, it is made up of crystal oscillator, frequency synthesis unit.Crystal oscillator export the frequency that fundamental frequency signal exports required X-band after many times frequency multiplication, frequency division, mixing.The utility model is in process frequency multiplication link link, adopt active frequency multiplication scheme namely: input signal is input to narrow band filter after amplifier saturation amplifies, get required harmonic component, guaranteed performance index is optimized while, effectively prevent step pipe frequency multiplier debugging amount in make an uproar mutually poor performance and the passive frequency multiplication of phase-locked scheme introducing large, complex structure, the shortcoming that reliability is low.Have scheme simple, phase noise is superior, the advantage that reliability is high, the advantage of its ultralow phase noise, improves existing star altitude measuring accuracy of measurement.

Description

A kind of star is with frequently combining source
Technical field
The utility model relates to space flight Microwave Active product scope, mainly relates to a kind of frequency being applied to monitoring and investigation marine environment satellite radar altimeter subsystem and combines source and device thereof.
Background technology
At present, satellite communication, especially the local vibration source of digital communication by satellite to frequency converter proposes higher requirement, as higher frequency stability, high spectral purity, lower phase noise, the output level met the demands, easily multi-frequency export conversion etc.For this reason, frequency converter all adopts microwave phaselock oscillator and microwave synthesizer as local frequency source of secondary usually.
The basic mode of microwave synthesizer has two kinds: direct-type and indirect type.Direct-type frequency synthesis has the fast feature of conversion radio frequency channel, but the arithmetic of frequency adopts the technology such as mixing, frequency multiplication, frequency division, thus can produce a large amount of harmonic waves in the course of the work, need suppress with filter, therefore device structure is complicated, cost and volume increase.Meanwhile, high order frequency also can cause output signal-to-noise ratio to degenerate.Therefore, seldom adopt in the earth station of direct frequency synthesizer.
Indirect frcquency synthesis uses the combine with technique such as Phase Lock Technique and digital frequency division to carry out arithmetic to frequency, harmonic component utilizes the filtering and do not adopt filter in addition of the narrow-band filtering characteristic of phase-locked loop, the scheme of indirect frequency synthesizer is a lot, and what satellite communication earth station adopted mainly contains mixer-phase lock, sampling phase-looked formula and digital frequency division phase-locking type three kinds.It is indirect frequency synthesis, i.e. Phase locking frequency synthesis that conventional star combines the frequency synthesis mode taked frequently, but because of phase noise performance superior not, the requirement of altimeter high-resolution to comprehensive low phase noise performance frequently can not be met.
Star source of frequently combining is used as radar altitude scoring system by frequency fundamental frequency signal being exported after many times frequency multiplication, frequency division, mixing required X-band and makes local oscillation signal.Wherein, X-band refers to the radio waveband of frequency at 8-12GHz, in electromagnetic spectrum, belong to microwave.And in some occasion, the frequency range of X-band is then 7-11.2GHz.For China's marine environment satellite radar altimeter subsystem index request, in order to meet the altimeter complete machine demand high to certainty of measurement, development Direct frequency synthesizer scheme realizes ultralow phase noise performance ultralow phase noise frequency source has its necessity as this system local oscillation signal.
Utility model content
In view of this, the utility model provides a kind of ultralow phase noise frequently to combine source, adopts Direct frequency synthesizer scheme to realize ultralow phase noise performance.
For reaching above-mentioned or other object, the utility model provides a kind of star and frequently combines source, and it comprises: crystal oscillator 1, its fundamental frequency signal Fr for exporting; Frequency synthesis unit 2, it for exporting the frequency of required X-band after frequency multiplication, frequency division, mixing; Wherein, described frequency synthesis unit 2 specifically comprises:
First power splitter 3, described fundamental frequency signal is divided into first via signal and the second road signal by it;
Described first via signal inputs 7 frequency multiplier 10, first filter 11, first amplifier 12,5 frequency dividers 13 successively and exports 7 × Fr ÷ 5 signal;
Described second road signal inputs 8 frequency multiplier 4, second filter 5, second amplifiers 6 successively and exports Fr × 8 signal;
Second power splitter, described 8 × Fr signal is divided into the 3rd road signal and the 4th road signal by it;
Input low-converter 9 with described 7 × Fr ÷ 5 signal after described 3rd road signal input the 3rd filter 8 filtering simultaneously and obtain down-conversion signal, described down-conversion signal inputs the 4th filter 14 again and exports Fr × 8-7 × Fr ÷ 5 signal; 4th road signal inputs 5 frequency multipliers 18 successively, the 5th filter 19,4 frequency multiplier 20, the 6th filter 21, the 3rd amplifier 22 export Fr × 8 × 5 × 4 signal;
Described Fr × 8-7 × Fr ÷ 5 signal that described low-converter 9 exports and described Fr × 8 × 5 × 4 signal input upconverter 15 more successively, the 7th filter 16, the 4th amplifier 17 export required frequency signal Fr × 8-7 × Fr ÷ 5+Fr × 8 × 5 × 4;
Described 8 × Fr signal merit divides 7 two-way, and down-conversion is carried out with 7 × Fr ÷ 5 signal in a road after described 3rd filter (8) filtering, then exports Fr × 8-7 × Fr ÷ 5 signal through filter 14;
Another Fr × 8, road signal amplifies output Fr × 8 × 5 × 4 signal through described 5 frequency multiplier 5 frequencys multiplication, the 5th filter filtering, described 4 frequency multiplier 20 quadruples, described 6th filter 21 filtering, the 6th filter 21; Fr × 8-7 × Fr ÷ 5 signal that down-conversion exports and Fr × 8 × 5 × 4 signal export frequently combine frequency signal Fr × 8-7 × Fr ÷ 5+Fr × 8 × 5 × 4 needed for source through up-conversion, filtering, amplifications;
Wherein, as get described 8 frequency multipliers 4 of harmonic wave, described 7 frequency multipliers 10, described 5 frequency multipliers 18, described 4 frequency multipliers 20 output be directly connected with the input of described second filter 5, described first filter 11, described 5th filter 19, described 6th filter 21 respectively.
Preferably, input signal is input to described second filter 5 respectively after described 8 frequency multipliers 4, described 7 frequency multipliers 10, described 5 frequency multipliers 18, described 4 frequency multiplier 20 saturation amplifications, described first filter 11, described 5th filter 19, described 6th filter 21 get required harmonic component.
Preferably, get described 8 frequency multipliers 4 of harmonic wave selected by, one chip amplifier that described 7 frequency multipliers 10, described 5 frequency multipliers 18, described 4 frequency multipliers 20 are high-gain, small area analysis.
Preferably, described first filter 11 after being connected to described 7 frequency multipliers 10, described second filter 5 after described 8 frequency multipliers 4 are arrowband LC filter.
Preferably, being connected to described 5th filter 19 after described 5 frequency multipliers 18 is dielectric filter.
Preferably, being connected to described 6th filter 21 after described 4 frequency multipliers 20 is cavity body filter.
The utility model compared with prior art has following advantage:
1, comparatively conventional passive frequency multiplier, adopts high-gain, the one chip amplifier of small area analysis realizes active frequency multiplication, reduce power consumption, meet spaceborne project to the requirement of auxiliary products long-term reliability.
2, adopt one chip amplifier to realize active frequency multiplication, reduce the deterioration of link additional noise to signal phase noise, effectively improve auxiliary products phase noise performance.
3, complete machine scheme is succinct, is easy to realize, and frequency multiplication link debugging amount is few.
accompanying drawing explanation
Fig. 1 is the structured flowchart that the utility model star combines source frequently;
Fig. 2 is the noise pattern that the utility model star combines source frequently.
Description of reference numerals:
1, crystal oscillator; 2, frequency synthesis unit; 3, power splitter; 4, amplifier; 5, filter; 6, amplifier; 7, power splitter; 8, filter; 9, frequency mixer; 10, amplifier; 11, filter; 12, amplifier; 13,5 frequency dividers; 14, filter; 15, frequency mixer; 16, filter; 17, amplifier; 18, amplifier; 19, filter; 20, amplifier; 21, filter; 22, amplifier.
embodiment
Fig. 1 is the structured flowchart that the utility model star combines source frequently.As shown in Figure 1, the utility model one embodiment provides a kind of star and frequently combines source, and it comprises: crystal oscillator 1, its fundamental frequency signal Fr for exporting; Frequency synthesis unit 2, it for exporting the frequency of required X-band after frequency multiplication, frequency division, mixing; Wherein, described frequency synthesis unit 2 specifically comprises:
First power splitter 3, described fundamental frequency signal is divided into first via signal and the second road signal by it;
Described first via signal inputs 7 frequency multiplier 10, first filter 11, first amplifier 12,5 frequency dividers 13 successively and exports 7 × Fr ÷ 5 signal;
Described second road signal inputs 8 frequency multiplier 4, second filter 5, second amplifiers 6 successively and exports Fr × 8 signal;
Second power splitter, described 8 × Fr signal is divided into the 3rd road signal and the 4th road signal by it;
Obtain down-conversion signal with input converter 9 while of described 7 × Fr ÷ 5 signal after described 3rd road signal input the 3rd filter 8 filtering, described down-conversion signal inputs the 4th filter 14 again and exports Fr × 8-7 × Fr ÷ 5 signal; 4th road signal inputs 5 frequency multipliers 18 successively, the 5th filter 19,4 frequency multiplier 20, the 6th filter 21, the 3rd amplifier 22 export Fr × 8 × 5 × 4 signal;
Described Fr × 8-7 × Fr ÷ 5 signal that described low-converter 9 exports and described Fr × 8 × 5 × 4 signal input upconverter 15 more successively, the 7th filter 16, the 4th amplifier 17 export required frequency signal Fr × 8-7 × Fr ÷ 5+Fr × 8 × 5 × 4;
Described 8 × Fr signal merit divides 7 two-way, and down-conversion 9 is carried out with 7 × Fr ÷ 5 signal in a road after filtering 8, then exports Fr × 8-7 × Fr ÷ 5 signal through filter 14;
Another Fr × 8, road signal exports Fr × 8 × 5 × 4 signals through 5 frequencys multiplication 18, filtering 19,4 frequency multiplication 20 filtering 21, amplification 22; Fr × 8-7 × Fr ÷ 5 signal and Fr × 8 × 5 × 4 signal that down-conversion 9 exports through up-conversion 15, filtering 16, amplifies 17 and exports frequency signal Fr × 8-7 × Fr ÷ 5+Fr × 8 × 5 × 4 needed for the comprehensive source of frequency;
Wherein, as get described 8 frequency multipliers 4 of harmonic wave, described 7 frequency multipliers 10, described 5 frequency multipliers 18, described 4 frequency multipliers 20 output be directly connected with the input of described second filter 5, described first filter 11, described 5th filter 19, described 6th filter 21 respectively.
Described crystal oscillator adopts the constant temperature crystal filter of Low phase noise, and its phase noise performance is better than-153dBc/Hz@1kHz ,-162dBc/Hz@10kHz.SMA66-3 and SMA4012 of M/A COM Inc. selected by the described amplifier for getting harmonic wave, and all the other amplifiers are the SMA amplifier chain of M/A COM Inc.; Described frequency is combined in source the amplifier out being used as to get harmonic wave and is directly connected filter, between the two without other components and parts.Described frequency combines the frequency mixer by the equal Ceramics level Hermetic Package of frequency mixer of frequency conversion in source; The described frequency divider realizing 5 division function is have lower phase noise floor performance frequency divider.
It is arrowband LC filter, narrowband dielectric filter and arrowband cavity body filter that described frequency combines in source the filter after being connected on frequency multiplication.
It is self-control level Hermetic Package module that described frequency combines the bare chip amplifier selected in source, and amplification chip is HMC565.
Described frequency is combined radio frequency output interface design impedance in source and is 50 Ω, and front and back are every straight input and output; Power interface serial connection decoupling network.
Fig. 2 is the noise pattern that the utility model star combines source frequency synthesis frequently, as shown in Figure 2, star of the present utility model is adopted frequently to combine source, gather three frequencies, e.g. ,-94.7516dBc/Hz@100Hz ,-106.8824dBc/Hz@1kHz,-122.5676dBc/Hz@10kHz. as can be seen here, adopt one chip amplifier to realize active frequency multiplication, reduce the deterioration of link additional noise to signal phase noise, effectively improve auxiliary products phase noise performance.
As a preferred embodiment, described amplifier 8 frequency multiplier 4,7 frequency multiplier 10,5 frequency multiplier 18,4 frequency multiplier 20 being used as double frequency function is welded in double-deck printed board by attachment process, then be fixed in aluminum enclosure with screw by circuit board; Described amplifier 4 frequency multiplier 20 being used as double frequency function, first printed board is welded on oxygen-free copper substrate by attachment process because the comparatively large (>=0.3W) processing step of power consumption changes to, again components and parts are welded on the circuit board with substrate by attachment process, to increase the radiating surface bottom components and parts; The all independent coelosis of mounting groove of described second filter 5, described first filter 11, described 5th filter 19, described 6th filter 21, avoids the filtering performance because of microwave signal space cross talk effects filter.
Described frequency is combined the cooling measure adopted for guarantee product high reliability in source and is comprised: the material (Arlon-CLTE-XT, conductive coefficient is better than 0.55) that printed board selects thermal conductivity high; Printed Circuit Board Design is double sided board, and front is circuit, and back side large area covers copper ground connection; Increase the ground connection via hole of some; Increase the density of installing hole between printed board and casing.
Described frequency is combined the mechanical measure adopted for guarantee product high reliability in source and is comprised: the described frequency cavity body structure combined in source is integral structure, from one block of whole aluminium, carry out rational configuration and layout, form many microwave cavities through being machined to, this mechanical structure more module assembled structure has better rigidity.
Below preferred implementation of the present utility model is described by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in above-mentioned execution mode; within the scope of technical conceive of the present utility model; can carry out multiple equivalents to the technical solution of the utility model, these equivalents all belong to protection range of the present utility model.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the utility model illustrates no longer separately to various possible compound mode.

Claims (6)

1. star is with frequently combining a source, it is characterized in that: it comprises:
Crystal oscillator (1), its fundamental frequency signal Fr for exporting;
Frequency synthesis unit (2), it for exporting the frequency of required X-band after frequency multiplication, frequency division, mixing;
Wherein, described frequency synthesis unit (2) specifically comprises:
First power splitter (3), described fundamental frequency signal is divided into first via signal and the second road signal by it;
Described first via signal inputs 7 frequency multipliers (10), the first filter (11), the first amplifier (12), 5 frequency dividers (13) output, 7 × Fr ÷ 5 signal successively;
Described second road signal inputs 8 frequency multipliers (4), the second filter (5), the second amplifier (6) output Fr × 8 signal successively;
Second power splitter, described Fr × 8 signal is divided into the 3rd road signal and the 4th road signal by it;
Input low-converter (9) with described 7 × Fr ÷ 5 signal after described 3rd road signal input the 3rd filter (8) filtering simultaneously and obtain down-conversion signal, described down-conversion signal inputs the 4th filter (14) again and exports Fr × 8-7 × Fr ÷ 5 signal;
4th road signal inputs 5 frequency multipliers (18), the 5th filter (19), 4 frequency multipliers (20), the 6th filter (21), the 3rd amplifier (22) output Fr × 8 × 5 × 4 signal successively;
Described Fr × 8-7 that described low-converter (9) exports × Fr ÷ 5 signal and described Fr × 8 × 5 × 4 signal input upconverter (15) more successively, the 7th filter (16), the 4th amplifier (17) export required frequency signal Fr × 8-7 × Fr ÷ 5+Fr × 8 × 5 × 4;
Described 8 × Fr signal merit divides (7) two-way, and down-conversion is carried out with 7 × Fr ÷ 5 signal in a road after described 3rd filter (8) filtering, then exports Fr × 8-7 × Fr ÷ 5 signal through filter (14); Another Fr × 8, road signal amplifies output Fr × 8 × 5 × 4 signal through described 5 frequency multiplier (18) 5 frequencys multiplication, described 5th filter (19) filtering, described 4 frequency multiplier 4 frequencys multiplication, described 6th filter (21) filtering, the 3rd amplifier (22); Fr × 8-7 × Fr ÷ 5 signal that down-conversion exports and Fr × 8 × 5 × 4 signal export frequently combine frequency signal Fr × 8-7 × Fr ÷ 5+Fr × 8 × 5 × 4 needed for source through up-conversion, filtering, amplifications;
Wherein, as get described 8 frequency multipliers (4) of harmonic wave, described 7 frequency multipliers (10), described 5 frequency multipliers (18), described 4 frequency multipliers (20) output be directly connected with the input of described second filter (5), described first filter (11), described 5th filter (19), described 6th filter (21) respectively.
2. frequently combine source according to a kind of star according to claim 1, it is characterized in that: input signal is input to described second filter (5) respectively after described 8 frequency multipliers (4), described 7 frequency multipliers (10), described 5 frequency multipliers (18), described 4 frequency multipliers (20) saturation amplification, required harmonic component got by described first filter (11), described 5th filter (19), described 6th filter (21).
3. frequently combine source according to a kind of star described in claim 1 or 2, it is characterized in that: selected by get described 8 frequency multipliers (4) of harmonic wave, one chip amplifier that described 7 frequency multipliers (10), described 5 frequency multipliers (18), described 4 frequency multipliers (20) are high-gain, small area analysis.
4. frequently combine source according to a kind of star according to claim 1, it is characterized in that: described second filter (5) be connected to after described first filter (11) after described 7 frequency multipliers (10), described 8 frequency multipliers (4) is arrowband LC filter.
5. frequently combine source according to a kind of star according to claim 1, it is characterized in that: being connected to described 5th filter (19) after described 5 frequency multipliers (18) is dielectric filter.
6. frequently combine source according to a kind of star according to claim 1, it is characterized in that: being connected to described 6th filter (21) after described 4 frequency multipliers (20) is cavity body filter.
CN201420302194.6U 2014-06-06 2014-06-06 A kind of star is with frequently combining source Expired - Lifetime CN204231328U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104065381A (en) * 2014-06-06 2014-09-24 中国电子科技集团公司第五十五研究所 Frequency synthesizer for satellites and frequency synthesis method of frequency synthesizer
CN109270375A (en) * 2018-09-29 2019-01-25 中国科学院紫金山天文台 Frequency discrimination type KIDs detector phase noise measurement circuit system and measurement method
CN109470936A (en) * 2018-09-29 2019-03-15 中国科学院紫金山天文台 KIDs noise of detector test circuit and test method based on active orthogonal frequency mixer
CN109508477A (en) * 2018-10-09 2019-03-22 南京沁智电子科技有限公司 It mutually makes an uproar under a kind of vibration environment and deteriorates low clock distribution block

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104065381A (en) * 2014-06-06 2014-09-24 中国电子科技集团公司第五十五研究所 Frequency synthesizer for satellites and frequency synthesis method of frequency synthesizer
CN109270375A (en) * 2018-09-29 2019-01-25 中国科学院紫金山天文台 Frequency discrimination type KIDs detector phase noise measurement circuit system and measurement method
CN109470936A (en) * 2018-09-29 2019-03-15 中国科学院紫金山天文台 KIDs noise of detector test circuit and test method based on active orthogonal frequency mixer
CN109270375B (en) * 2018-09-29 2020-09-15 中国科学院紫金山天文台 Circuit system and method for measuring phase noise of frequency discrimination type KIDs detector
CN109470936B (en) * 2018-09-29 2020-11-03 中国科学院紫金山天文台 KIDs detector noise test circuit and test method based on active quadrature mixer
CN109508477A (en) * 2018-10-09 2019-03-22 南京沁智电子科技有限公司 It mutually makes an uproar under a kind of vibration environment and deteriorates low clock distribution block
CN109508477B (en) * 2018-10-09 2023-08-18 南京沁智电子科技有限公司 Clock distribution module with low phase noise degradation in vibration environment

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Granted publication date: 20150325