CN110166048B - Novel ultra-wideband low-phase noise frequency source - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L2207/00—Indexing scheme relating to automatic control of frequency or phase and to synchronisation
- H03L2207/12—Indirect frequency synthesis using a mixer in the phase-locked loop
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Abstract
The invention discloses a novel ultra-wideband low-phase noise frequency source, which relates to the technical field of microwave communication, and the frequency source realizes ultra-small stepping and narrow-band low spurious performance by using a high-speed DDS technology, generates a small stepping, low-phase noise and low spurious frequency hopping low local oscillation signal by using the latest low-noise PLL technology, generates a low-phase noise high local oscillation signal by using a low-noise comb spectrum frequency multiplication technology, effectively reduces broadband spurious by using a switch filtering technology, and supplements the generation of low-frequency band signals by using a numerical control frequency division technology.
Description
Technical Field
The invention relates to the technical field of microwave communication, in particular to a novel ultra-wideband low-phase noise frequency source.
Background
The frequency source is a signal generating source of the radar system for providing local oscillation signals and transmitting excitation signals for the radar, and is known as the heart of the radar system. Through many years of research and development, china has a major breakthrough in frequency synthesis technology, but how to make the bandwidth of a frequency source wider, smaller and the index better and better is still the key point of the frequency source research.
Disclosure of Invention
The inventor provides a novel ultra-wideband low-phase-noise frequency source aiming at the problems and the technical requirements, and the frequency source has the characteristics of ultra-wideband, low phase noise, low spurious, small steps, small size and low cost, and is suitable for being applied to any system with high performance requirements as a generalized module.
The technical scheme of the invention is as follows:
a novel ultra-wideband low phase noise frequency source, the novel ultra-wideband low phase noise frequency source comprising: the reference signal generated by the crystal oscillator is divided into two paths by the first power divider, one path is used as a first reference excitation and provided for the phase-locked loop, the other path is provided for the first low-noise frequency doubling circuit to carry out frequency doubling filtering, and the phase-locked loop generates a frequency hopping low local oscillation signal under the action of the first reference excitation and is connected to the first mixer; the output signal of the first low-noise frequency doubling circuit is divided into two paths through the second power divider, one path is used as second reference excitation to be provided for the low-noise comb spectrum frequency doubling device, the other path is provided for the second low-noise frequency doubling circuit to carry out frequency doubling filtering, the low-noise comb spectrum frequency doubling device generates harmonic signals under the action of the second reference excitation, the harmonic signals generate high local oscillation signals through the first switch filter bank and are connected to the second mixer, the second low-noise frequency doubling circuit carries out frequency doubling filtering on the reference signals subjected to frequency doubling filtering of the first low-noise frequency doubling circuit again to generate 3.6GHz output signals, the 3.6GHz output signal of the second low-noise frequency doubling circuit is divided into two paths through the third power divider, one path is used as third reference excitation to be provided for the DDS, and the other path is used as frequency standard signals to be connected to the third mixer;
The DDS generates an intermediate frequency signal under the action of a third reference excitation of 3.6GHz and is connected to the first mixer, the first mixer mixes the intermediate frequency signal and the frequency hopping low local oscillator signal and then is connected to the second mixer through the second switch filter bank, the second mixer mixes the signal output by the second switch filter bank and the high local oscillator signal and then is input to the input end of the fourth switch filter bank through the third switch filter bank, one channel of the fourth switch filter bank is directly connected to the output end, the other channel of the fourth switch filter bank is connected to the third mixer to mix with the frequency standard signal of 3.6GHz, the output end of the third mixer is communicated to the output end of the fourth switch filter bank through the fifth switch filter bank, and the output end of the fourth switch filter bank is connected with the numerical control frequency divider to output.
The first switch filter bank and the second switch filter bank are respectively one-out-of-three switch filter banks, and the third switch filter bank, the fourth switch filter bank and the fifth switch filter bank are respectively one-out-of-two switch filter banks; the phase-locked loop generates a frequency hopping low local oscillation signal of 2.1-3.1 GHz and 20MHz step by step under the action of the first reference excitation of 100MHz by a reference signal of 100MHz generated by the crystal oscillator; the first low-noise frequency doubling circuit generates a 1.2GHz signal after frequency doubling filtering of a reference signal of 100 MHz; the low-noise comb spectrum frequency multiplier generates a 1.2GHz harmonic signal under the action of a 1.2GHz second reference excitation and generates high local oscillator signals of 10.8GHz, 12GHz and 13.2GHz after passing through the first switch filter bank; the second low-noise frequency doubling circuit generates a 3.6GHz signal after frequency doubling filtering of the 1.2GHz signal;
Under the action of a third reference excitation of 3.6GHz, the DDS generates an intermediate frequency signal of 500+/-10 MHz with the minimum Step being Step which is smaller than 1Hz, the first mixer mixes the intermediate frequency signal with a frequency hopping low local oscillator signal of 2.1-3.1 GHz with the Step being 20MHz, and the signal output by the first mixer generates a signal of 2.4-3.6 GHz with the minimum Step being Step after passing through a second switch filter bank; the second mixer mixes the 2.4-3.6 GHz signals output by the second switch filter bank with the high local oscillator signals, then generates 13.2-16.8 GHz signals through the third switch filter bank, outputs the signals to the fourth switch filter bank, one channel of the fourth switch filter bank is directly connected with the third mixer to generate 13.2-16.8 GHz signals, the other channel is connected with the third mixer to mix with 3.6GHz frequency standard signals and generates two channels of 10-13.2 GHz signals and 16.8-20 GHz signals through the fifth switch filter bank, and three channels of signals generated by the fourth switch filter bank form 10-20 GHz broadband signals and obtain 0.625-20 GHz ultra-wideband signals which are stepped into Step by a digital control frequency divider.
The beneficial technical effects of the invention are as follows:
The application discloses a novel ultra-wideband low-phase noise frequency source, which realizes ultra-small stepping and narrow-band low spurious performance by using a high-speed DDS technology, generates a small stepping, low-phase noise and low spurious frequency hopping low local oscillator signal by using the latest low-noise PLL technology, generates a low-phase noise high local oscillator signal by using a low-noise comb spectrum frequency multiplication technology, effectively reduces broadband spurious frequency by using a switch filtering technology, and supplements low-frequency band signal generation by using a numerical control frequency division technology.
Drawings
FIG. 1 is a schematic diagram of a frequency synthesis scheme of the novel ultra-wideband low phase noise frequency source disclosed by the application.
Fig. 2 is a frequency synthesis scheme diagram with an optimal technical index of the novel ultra-wideband low-phase noise frequency source disclosed by the application.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
The application discloses a novel ultra-wideband low-phase-noise frequency source, please refer to fig. 1, which comprises: the reference signal generated by the crystal oscillator is divided into two paths by the first power divider, wherein one path is used as a first reference excitation and provided for a phase-locked loop (PLL), and the other path is provided for a first low-noise frequency doubling circuit for frequency doubling filtering. The PLL generates a frequency-hopped low local oscillator signal under the influence of the first reference excitation and is connected to the first mixer V1. The output signal of the first low-noise frequency doubling circuit is divided into two paths by the second power divider, one path is used as second reference excitation and provided for the low-noise comb spectrum frequency doubling device, and the other path is provided for the second low-noise frequency doubling circuit to carry out frequency doubling filtering. The low-noise comb spectrum frequency multiplier generates harmonic signals under the action of second reference excitation, and the harmonic signals generate high local oscillation signals through the first switch filter bank and are connected to the second mixer V2. The second low-noise frequency doubling circuit performs frequency doubling filtering on the reference signal subjected to frequency doubling filtering by the first low-noise frequency doubling circuit again to generate a 3.6GHz output signal, the 3.6GHz output signal generated by the second low-noise frequency doubling circuit is divided into two paths through a third power divider, one path serves as a third reference excitation and is provided for a DDS (DDS), and the other path serves as a frequency standard signal and is connected to a third mixer V3. Wherein the first low noise frequency multiplier circuit and the second low noise frequency multiplier circuit may be respectively constructed of a frequency multiplier and a filter.
The DDS generates an intermediate frequency signal under the action of the third reference excitation of 3.6GHz and is connected to the first mixer V1, and the first mixer V1 mixes the intermediate frequency signal with the frequency hopping low local oscillator signal. The signal mixed by the first mixer V1 passes through the second switch filter bank and then is connected to the second mixer V2, and the second mixer V2 mixes the signal output by the second switch filter bank with the high local oscillation signal. The signal mixed by the two mixers V2 is input to the input end of the fourth switching filter bank through the third switching filter bank, one channel of the fourth switching filter bank is directly connected to the output end of the fourth switching filter bank, the other channel is connected to the third mixer V3, and the third mixer V3 mixes the signal with the frequency standard signal of 3.6 GHz. The signals mixed by the third mixer are communicated to the output end of the fourth switch filter bank after passing through the fifth switch filter bank. The output end of the fourth switch filter bank is connected with the numerical control frequency divider for output.
The application uses the latest high-speed DDS technology to realize ultra-small stepping less than 1Hz and narrow-band low spurious performance, uses the latest low-noise PLL technology to generate small stepping, low phase noise and low spurious frequency hopping low local oscillation signals, uses the low-noise comb spectrum frequency multiplication technology to generate low phase noise high local oscillation signals, uses the switch filtering technology to effectively reduce broadband spurious, and uses the numerical control frequency division technology to complement the generation of low-frequency band signals to finally realize ultra-broadband frequency coverage, so that the frequency source can realize ultra-broadband, low phase noise, low spurious, small stepping, small size and low cost, and is very suitable for being applied to any system with higher performance requirements as a generalized module. Meanwhile, the application further carefully designs the frequency synthesis scheme involved in the frequency source to ensure that the performance and index of the whole frequency source reach the optimal effect, and can finally realize ultra-wideband frequency coverage of 0.625-20 GHz, and specifically, please refer to fig. 2:
The first switch filter bank and the second switch filter bank are three-choice switch filter banks which respectively comprise an input single-pole three-throw switch, a three-way filter and an output single-pole three-throw switch, the fixed end of the input single-pole three-throw switch is used as the input end of the three-choice switch filter bank, the fixed end of the output single-pole three-throw switch is used as the output end of the three-choice switch filter bank, the input ends of the three-way filter are respectively connected with the three movable ends of the input single-pole three-throw switch, and the output ends of the three-way filter are respectively connected with the three movable ends of the output single-pole three-throw switch to form three-way filter channels. The third switch filter bank and the fifth switch filter bank are two-way switch filter banks and respectively comprise an input single-pole double-throw switch, two-way filters and an output single-pole double-throw switch, the fixed end of the input single-pole double-throw switch is used as the input end of the two-way switch filter bank, the fixed end of the output single-pole double-throw switch is used as the output end of the three-way switch filter bank, the input ends of the two-way filters are respectively connected with two movable ends including the input single-pole double-throw switch, and the output ends of the two-way filters are respectively connected with the two movable ends of the output single-pole double-throw switch to form two-way filter paths. The fourth switch filter bank is also a switch filter bank which is two-way or one-way and comprises an input single-pole double-throw switch and an output single-pole double-throw switch, wherein the fixed end of the input single-pole double-throw switch is used as the input end of the fourth switch filter bank, the fixed end of the output single-pole double-throw switch is used as the output end of the fourth switch filter bank, one movable end of the input single-pole double-throw switch and one movable end of the output single-pole double-throw switch are directly connected to form a channel which is directly connected, and a filter is not needed to be arranged on the channel because the signals of the channel do not pass through frequency mixing, the other movable end of the input single-pole double-throw switch is connected to a third frequency mixer V3, the third frequency mixer V3 is connected to the input end of the fifth switch filter bank, and the output end of the fifth switch filter bank is connected to the other movable end of the output single-pole double-throw switch to form another frequency mixing filter channel.
The crystal oscillator generates a reference signal of 100M, and one path of the reference signal of 100M is used as a first reference excitation to the PLL after being subjected to power division by the first power divider, and the other path of the reference signal is used as a first reference excitation to the first low-noise frequency doubling circuit. The PLL generates a frequency hopping low local oscillator signal of 2.1 to 3.1GHz stepped to 20MHz to the first mixer V1 under the action of a first reference stimulus of 100M. The first low-noise frequency doubling circuit performs frequency doubling filtering on the 100M signal to generate a 1.2GHz signal, and one path of the 1.2GGHz signal is used as a second reference excitation to the low-noise comb spectrum frequency multiplier after being subjected to power division by the second power divider, and the other path of the 1.2GGHz signal is used as a second reference excitation to the second low-noise frequency doubling circuit. The low-noise comb spectrum frequency multiplier generates a 1.2GHz harmonic signal under the action of a 1.2GHz second reference excitation, and generates high local oscillation signals of 10.8GHz, 12GHz and 13.2GHz to the second mixer V2 after passing through the first switch filter bank of the three choices. The second low-noise frequency multiplication circuit performs frequency multiplication filtering on the 1.2GHz signal to generate a 3.6GHz signal, and one path of the 3.6GHz signal is used as a third reference excitation to the DDS after being subjected to power division by the third power divider, and the other path of the 3.6GHz signal is used as a frequency standard signal to the third mixer V3.
The DDS generates an intermediate frequency signal of 500+/-10 MHz with a minimum Step of Step < 1Hz under the action of the third reference excitation of 3.6GHz, and the minimum Step is about 0.84Hz according to practical calculation. The first mixer V1 mixes the intermediate frequency signal of 500+/-10 MHz and the frequency hopping low local oscillation signal of 2.1-3.1 GHz, and the mixed signal generates a signal with 2.4-3.6 GHz and the minimum Step of Step after passing through the second switch filter bank of one of three. The second mixer V2 mixes the high local oscillation signals of 2.4-3.6 GHz and 10.8GHz, 12GHz and 13.2GHz output by the second switch filter bank, and the mixed signals generate signals of 13.2-16.8 GHz after passing through the second switch filter bank, and the signals are output to the fourth switch filter bank. One channel of the second-choice fourth switch filter bank is directly connected to generate 13.2-16.8 GHz signals, the other channel is connected to the third mixer V3 to mix with 3.6GHz frequency standard signals, and the mixed signals pass through the second-choice fifth switch filter bank to generate 10-13.2 GHz signals and 16.8-20 GHz signals. And the three signals generated by the fourth switch filter bank are combined together to form a 10-20 GHz broadband signal. Finally, the broadband signal of 10-20 GHz is processed by a numerical control frequency divider (N= 1/2/3/4/8/16) to obtain the ultra-broadband signal of 0.625-20 GHz, which is stepped to Step.
The parameters of each part in the frequency synthesis scheme are determined by the applicant after careful design and debugging, the parameters of each part are matched with each other, the bandwidth, phase noise and spurious of the frequency source can be in a better state through the matching of the parameters, the number of filters in the frequency source can be minimized, the size of the frequency source is minimized, and the cost is minimized. The following key points exist in the parameter design:
a) The minimum frequency step must be realized by the DDS, and in order to ensure the optimal design of the narrow band spurious, the bandwidth of the DDS signal should not be too wide, preferably 20 MHz.
B) The PLL generates a frequency hopping low local oscillator signal with the step of 20MHz, which can remarkably simplify the circuit and save the cost and reduce the size, but because of the limitation of the phase noise of the PLL, HMC703 is selected as a phase discriminator, 20MHz is adopted as the phase discrimination frequency, an integer HiK mode is started, and after calculation and verification, the 3.1GHz phase noise can reach-110 dBc/Hz, and the higher the frequency, the worse (higher) the phase noise, the higher the frequency of the frequency hopping low local oscillator signal is, which is not suitable.
C) The spurious optimization is required, the intermodulation component calculation of the mixer is accurate, the low-order component is prevented from falling into the passband as much as possible, so that the frequency of the frequency hopping low local oscillation signal is not easy to be lowered to 1.9GHz, and the 2.8GHz (2 LO-2 IF) is prevented from falling into the passband.
D) To generate the ultra-wideband of 0.625-20 GHz, only 10-20 GHz is needed to be generated due to the existence of the numerical control frequency divider.
E) To reduce the number of filters in the frequency source, and to save space and cost, the sum (lo+if) and difference (LO-IF) frequencies generated by the mixing must be fully utilized. Because 10 GHz-20 GHz is 10GHz bandwidth, and the frequency standard signal of 3.6GHz exists, only the intermediate frequency band of 13.2-16.8 GHz is needed to be generated, and the circuit can be greatly simplified.
The frequency source can finally reach the following technical indexes through the matching among the parameters:
the above is only a preferred embodiment of the present application, and the present application is not limited to the above examples. It is to be understood that other modifications and variations which may be directly derived or contemplated by those skilled in the art without departing from the spirit and concepts of the present application are deemed to be included within the scope of the present application.
Claims (1)
1. The utility model provides a novel ultra wide band low phase noise frequency source which characterized in that, novel ultra wide band low phase noise frequency source includes: the reference signal generated by the crystal oscillator is divided into two paths by a first power divider, one path is used as a first reference excitation and provided for a phase-locked loop, the other path is provided for a first low-noise frequency doubling circuit to carry out frequency doubling filtering, and the phase-locked loop generates a frequency hopping low local oscillation signal under the action of the first reference excitation and is connected to a first mixer; the output signal of the first low-noise frequency doubling circuit is divided into two paths by a second power divider, one path is used as second reference excitation and is provided for a low-noise comb spectrum frequency multiplier, the other path is provided for a second low-noise frequency doubling circuit to carry out frequency doubling filtering, the low-noise comb spectrum frequency multiplier generates harmonic signals under the action of the second reference excitation, the harmonic signals generate high local oscillation signals through a first switch filter bank and are connected to a second mixer, the second low-noise frequency doubling circuit carries out frequency doubling filtering on the reference signals subjected to frequency doubling filtering of the first low-noise frequency doubling circuit again to generate 3.6GHz output signals, the 3.6GHz output signal of the second low-noise frequency doubling circuit is divided into two paths by a third power divider, one path is used as third reference excitation and is provided for DDS, and the other path is used as a frequency standard signal and is connected to the third mixer;
The DDS generates an intermediate frequency signal under the action of the third reference excitation of 3.6GHz and is connected to the first mixer, the first mixer mixes the intermediate frequency signal and the frequency hopping low local oscillator signal and then is connected to the second mixer through a second switch filter bank, the second mixer mixes the signal output by the second switch filter bank and the high local oscillator signal and then is input to the input end of a fourth switch filter bank through the third switch filter bank, one channel of the fourth switch filter bank is directly connected to the output end, the other channel of the fourth switch filter bank is connected to the third mixer and is mixed with the frequency standard signal of 3.6GHz, the output end of the third mixer is communicated to the output end of the fourth switch filter bank through a fifth switch filter bank, and the output end of the fourth switch filter bank is connected with a frequency divider for output;
The first switch filter bank and the second switch filter bank are respectively one-out-of-three switch filter banks, and the third switch filter bank, the fourth switch filter bank and the fifth switch filter bank are respectively one-out-of-two switch filter banks; the phase-locked loop generates the frequency hopping low local oscillation signal with the frequency hopping of 2.1-3.1 GHz and the step of 20MHz under the action of the first reference excitation of 100MHz by the reference signal of 100MHz generated by the crystal oscillator; the first low-noise frequency doubling circuit generates a 1.2GHz signal after frequency doubling filtering of a reference signal of 100 MHz; the low-noise comb spectrum frequency multiplier generates a 1.2GHz harmonic signal under the action of the second reference excitation of 1.2GHz and generates the Gao Benzhen signals of 10.8GHz, 12GHz and 13.2GHz after passing through the first switch filter bank; the second low-noise frequency multiplication circuit generates a signal of 3.6GHz after frequency multiplication filtering of the signal of 1.2 GHz;
The DDS generates the intermediate frequency signal with the minimum Step of 500+/-10 MHz under the action of the third reference excitation of 3.6GHz, the Step is less than 1Hz, the first mixer mixes the intermediate frequency signal with the frequency hopping low local oscillation signal with the Step of 2.1-3.1 GHz and the Step of 20MHz, and the signal output by the first mixer generates the signal with the minimum Step of 2.4-3.6 GHz after passing through the second switch filter bank; the second mixer mixes the 2.4-3.6 GHz signals output by the second switch filter bank with the high local oscillator signals, 13.2-16.8 GHz signals are generated by the third switch filter bank and are transmitted to the fourth switch filter bank, one channel of the fourth switch filter bank directly generates 13.2-16.8 GHz signals, the other channel is connected to the third mixer, mixes with the 3.6GHz frequency standard signals and generates 10-13.2 GHz signals and 16.8-20 GHz signals by the fifth switch filter bank, and three channels of signals generated by the fourth switch filter bank form 10-20 GHz broadband signals and obtain 0.625-20 GHz ultra-wideband signals which are stepped into Step by the numerical control frequency divider.
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| CN113452410B (en) * | 2020-03-25 | 2022-06-14 | 北京振兴计量测试研究所 | Frequency hopping broadband channel frequency synthesizer and frequency synthesis method |
| CN112087230A (en) * | 2020-09-17 | 2020-12-15 | 中国科学院空天信息创新研究院 | Broadband linear frequency modulation signal generating device and method |
| CN113541687B (en) * | 2021-08-20 | 2024-06-21 | 成都西蒙电子技术有限公司 | Low phase noise narrowband frequency synthesizer |
| CN114070308B (en) * | 2022-01-17 | 2022-11-22 | 中国电子科技集团公司第二十九研究所 | Broadband low-phase-noise frequency synthesis circuit |
| CN114553221A (en) * | 2022-02-25 | 2022-05-27 | 重庆西南集成电路设计有限责任公司 | Frequency source and method for generating the same |
| CN114944865A (en) * | 2022-05-16 | 2022-08-26 | 河北东森电子科技有限公司 | Design and application method of ultra-wideband Ka-band satellite radio frequency unit |
| CN116155275B (en) * | 2023-04-19 | 2023-07-28 | 成都世源频控技术股份有限公司 | Broadband fine stepping phase-locked source with repeatable phase |
| CN116318130B (en) * | 2023-05-22 | 2023-08-04 | 英诺微(成都)电子有限公司 | High dynamic high linearity source circuit |
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| DE102011008350A1 (en) * | 2011-01-12 | 2012-07-26 | Rohde & Schwarz Gmbh & Co. Kg | High frequency generator with low phase noise |
| CN105553469A (en) * | 2015-12-11 | 2016-05-04 | 北京无线电计量测试研究所 | Low-phase noise frequency source |
| CN205232198U (en) * | 2015-12-16 | 2016-05-11 | 贵州航天计量测试技术研究所 | Mistake proofing lock high performance broadband microwave frequency synthesizer |
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