CN107976653B - L-band 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
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
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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
- G01S7/40—Means for monitoring or calibrating
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses an L-band low-phase-noise frequency source, which comprises a reference source module, a clock signal module, a local oscillator signal module and a control circuit module, wherein the reference source module is connected with the clock signal module; the reference source module generates an 80MHz reference source signal which is respectively output to the clock signal module, the local oscillator signal module and the control circuit module; the clock signal module is used for realizing the four frequency division of a reference source signal and generating a 20MHz clock signal and a power detection signal of the radar system; the control circuit module mainly comprises an FPGA control circuit and is used for controlling the local oscillation signal module to output a frequency signal, receiving a reference source signal and a power detection signal and judging system fault information. The invention adopts a frequency synthesis mode combining direct analog synthesis and direct digital synthesis, so that the frequency source has lower phase noise, higher output frequency spectrum purity, short frequency hopping time interval, good parasitic inhibition performance and higher frequency resolution.
Description
Technical Field
The invention relates to the field of radar systems, in particular to an L-band low-phase-noise frequency source.
Background
In order to obtain the processing gain, the strong clutter suppression capability and the anti-interference capability of the coherent signal, the L-band low-altitude radar realizes the effective detection of a low-altitude small target under a clutter background and has higher requirements on the performances of phase noise, spectrum purity, frequency hopping conversion time and the like of a frequency source. The radar system is required to be designed by adopting a reasonable frequency synthesis mode, and the main frequency synthesis modes at present are a direct analog synthesis technology, a direct digital synthesis technology and an indirect frequency synthesis technology.
The direct analog synthesis technology (DAS) is to use the frequency generated by a stable oscillator as a reference, and generate various required frequencies through frequency division, frequency multiplication, frequency mixing and filtering, and has the advantages of low phase noise, short frequency conversion time and the like, and has the defects of complex system design, low frequency spectrum purity, excessive spurious components and the like.
The Direct Digital Synthesis (DDS) technology directly performs digital sampling on a reference clock, and generates a high-resolution frequency signal in real time by digital processing technology through digital-to-analog conversion and continuous phase conversion, and has the advantages of high frequency resolution, fast frequency conversion time, continuous output phase, flexible structure and the like, but the application range is limited due to higher phase noise, low upper limit of output frequency and the like.
The indirect frequency synthesis (PLL) uses the frequency generated by a stable oscillator as a reference, and generates the required frequency by utilizing the characteristic of a phase-locked loop or phase-locked frequency multiplication, and has the advantages of extremely wide frequency range, good spurious suppression performance, high output spectrum purity, small volume and the like, but has the defects of long frequency conversion time, limited frequency resolution and the like.
The above frequency source synthesis method cannot fully meet the use requirement of the L-band low-altitude radar system, so that it is highly desirable to provide a novel L-band low-phase noise frequency source to solve the above problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing an L-band low-phase-noise frequency source with low phase noise, good spurious suppression and short frequency hopping time interval.
In order to solve the technical problems, the invention adopts a technical scheme that: the L-band low-phase noise frequency source mainly comprises a reference source module, a clock signal module, a local oscillator signal module and a control circuit module;
the reference source module generates an 80MHz reference source signal which is respectively output to the clock signal module, the local oscillator signal module and the control circuit module;
the clock signal module mainly comprises a four-frequency dividing circuit, a filter circuit, a coupling circuit and a power detection circuit which are connected in sequence, and is used for realizing four-frequency division of a reference source signal and generating a 20MHz clock signal and a power detection signal of a radar system;
the local oscillation signal module comprises a local oscillation signal module and two local oscillation signal modules; the local oscillator signal module mainly comprises a fine frequency standard module circuit, a coarse frequency standard module circuit, a mixing amplifying circuit and a post-processing circuit, wherein the coarse frequency standard module circuit outputs a sampling clock signal to the fine frequency standard module circuit and a coarse frequency standard signal to the mixing amplifying circuit; the two local oscillation signal module generates two local oscillation signals and a power detection signal through frequency mixing, frequency dividing and frequency doubling of a reference source signal and a clock signal;
the control circuit module mainly comprises an FPGA control circuit and is used for controlling the local oscillation signal module to output a frequency signal, receiving a reference source signal and a power detection signal and judging system fault information.
In a preferred embodiment of the present invention, the reference source module mainly includes a crystal oscillator signal source and a power divider connected to the crystal oscillator signal source, where the crystal oscillator signal source generates an 80MHz reference source signal and implements four paths of power division through the power divider.
Furthermore, the crystal oscillator signal source adopts an anti-vibration low-phase-noise constant-temperature crystal oscillator OXK581D with 80MHz, has ultra-low phase noise and can be reduced to-165 dBc@1KHz.
In a preferred embodiment of the present invention, the coarse frequency module circuit mainly includes a comb frequency multiplication circuit, and a first switch filter circuit connected to the comb frequency multiplication circuit, where the first switch filter circuit outputs three coarse frequency signals of 1520MHz, 1600MHz and 1680MHz and a DDS sampling clock signal of 960 MHz. The comb frequency doubling circuit carries out high-efficiency frequency doubling on the reference source signal to generate a series of frequency spectrums, and the four signals are selected through the first switch filter circuit group.
In a preferred embodiment of the present invention, the fine frequency scale module circuit mainly includes a frequency direct synthesis circuit, and a second switch filter circuit connected to the frequency direct synthesis circuit, wherein an input end of the frequency direct synthesis circuit is input with an 80MHz reference source signal and a 960MHz DDS sampling clock signal, and the second switch filter circuit outputs a 250-325 MHz fine frequency scale signal.
Further, the frequency direct synthesis circuit adopts a direct digital frequency synthesizer DDS. The frequency of the DDS output signal is controlled by an FPGA control circuit.
In a preferred embodiment of the present invention, the mixer amplifier circuit mainly includes a mixer and an amplifier connected to each other. The frequency mixing amplifying circuit mixes and amplifies three input 1520MHz, 1600MHz and 1680MHz coarse frequency standard signals and 250-325 MHz fine frequency standard signals, and sends the signals to the post-processing circuit for processing the mixed signals.
In a preferred embodiment of the present invention, the post-processing circuit mainly includes a power detection circuit, a third switch filter circuit, a coupling circuit, and a power amplifying circuit, which are sequentially connected, and an output end of the coupling circuit is connected to the power detection circuit. The post-processing circuit filters and amplifies the input mixed signals and outputs a local oscillation signal of 1775 MHz-1975 MHz to the radar system. In addition, the filtered mixed signal outputs a path of signal to the power detection circuit through the coupling circuit, and outputs a detection signal to the FPGA control circuit through the power detection.
In a preferred embodiment of the present invention, the two local oscillator signal modules mainly include a divide-by-four circuit, a divide-by-five circuit, a first mixer circuit, a second mixer circuit, a third mixer circuit, a fourth mixer circuit, a filter amplifier circuit, a coupling circuit, and a power detection circuit;
the first frequency mixing circuit inputs an 80MHz reference source signal and a 20MHz clock signal, and outputs a 100MHz first frequency mixing signal to the second frequency mixing circuit and the third frequency mixing circuit;
the second frequency mixing circuit inputs the 80MHz reference source signal and the 100MHz first frequency mixing signal, outputs the 180MHz second frequency mixing signal to the four frequency dividing circuit, and the four frequency dividing circuit outputs the 45MHz frequency dividing signal;
the third mixing circuit inputs the 100MHz first mixing signal, the 45MHz frequency division signal and the 145MHz third mixing signal;
the five-time frequency circuit inputs an 80MHz reference source signal and outputs a 400MHz frequency multiplication signal to the fourth frequency mixing circuit, the output signal of the fourth frequency mixing circuit outputs a two local oscillation signal with the frequency of 545MHz after passing through the filtering amplifying circuit and the coupling circuit, and the coupling circuit outputs one path of two local oscillation signals to the power detection circuit for signal power detection.
The beneficial effects of the invention are as follows:
(1) The invention adopts a frequency synthesis mode combining direct analog synthesis and direct digital synthesis, combines the advantages of the two modes, and ensures that the frequency source has the advantages of lower phase noise, higher output frequency spectrum purity, short frequency hopping time interval, good spurious suppression performance, higher frequency resolution and the like, provides signals with low phase noise for the radar, improves the improvement factor of a radar system and improves the low-altitude small target detection capability of the radar;
(2) The invention adopts a modularized design, the system structure is relatively simple, and the system reliability is improved;
(3) The invention adopts the signal self-detection technology, can realize the monitoring of the output clock and the local oscillation signal power through the FPGA control circuit, effectively judges the fault information of the system and reduces the maintenance difficulty of the system.
Drawings
FIG. 1 is a schematic block diagram of a preferred embodiment of an L-band low phase noise frequency source of the present invention;
fig. 2 is a block diagram of the structure of the L-band low phase noise frequency source.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Referring to fig. 1 and 2, an embodiment of the present invention includes:
an L-band low-phase noise frequency source mainly comprises a reference source module, a clock signal module, a local oscillator signal module and a control circuit module.
The reference source module mainly comprises a crystal oscillator signal source and a power divider, wherein the crystal oscillator signal source generates an 80MHz reference source signal, four paths of power division are realized through the power divider, and the 80MHz reference source signal is respectively output to the clock signal module, the local oscillator signal module and the control circuit module to generate a 20MHz clock signal of the radar system, the local oscillator signal and a sampling clock of the control module.
Preferably, the crystal oscillator signal source adopts an anti-vibration low-phase-noise constant-temperature crystal oscillator OXK581D with 80MHz, has ultra-low phase noise and can be reduced to-165 dBc@1KHz.
The clock signal module mainly comprises a four-frequency dividing circuit, a filter circuit, a coupling circuit and a power detection circuit, wherein a reference source signal is subjected to four-frequency division through the four-frequency dividing circuit to output two paths of signals, one path of signals is a 20MHz clock signal and is output to the two local oscillation signal module, the other path of four-frequency dividing signals is subjected to filtering through the filter circuit and then is subjected to coupling circuit to generate two paths of signals, one path of signals is subjected to power detection through the power detection circuit to output the power detection signal, and the other path of signals is subjected to 20MHz clock signal of the radar system.
The local oscillation signal module comprises a local oscillation signal module and two local oscillation signal modules.
The local oscillator signal module mainly comprises a fine frequency standard module circuit, a coarse frequency standard module circuit, a mixing amplifying circuit and a post-processing circuit, wherein the coarse frequency standard module circuit outputs one path of sampling clock signals to the fine frequency standard module circuit and one path of coarse frequency standard signals to the mixing amplifying circuit, the output end of the fine frequency standard module circuit is connected with the input end of the mixing amplifying circuit, the output end of the mixing amplifying circuit is connected with the post-processing circuit, and the post-processing circuit outputs a local oscillator signal and a power detection signal. The local oscillator signal module generates a fine frequency standard signal and a coarse frequency standard signal respectively through direct digital synthesis and direct analog synthesis, mixes and amplifies the fine frequency standard signal and the coarse frequency standard signal through a mixing amplifying circuit, filters, couples and amplifies power through a post-processing module, outputs the local oscillator signal to a radar system, provides a local oscillator signal for up-down frequency conversion of a transmitting and receiving channel of the radar, and outputs a power detection signal to a control circuit module.
The circuit structure and principle of the local oscillator signal module are described in detail below.
The coarse frequency scale module circuit mainly comprises a comb frequency multiplication circuit and a first switch filter circuit connected with the comb frequency multiplication circuit. The first switch filter circuit outputs three coarse frequency standard signals of 1520MHz, 1600MHz and 1680MHz to the mixer amplifier circuit and a DDS sampling clock signal of 960MHz to the DDS. The comb frequency doubling circuit carries out high-efficiency frequency doubling on a reference source signal by adopting a step diode to generate a series of frequency spectrums, and the four signals are selected by a first switch filter circuit group.
The fine frequency standard module circuit mainly comprises a frequency direct synthesis circuit and a second switch filter circuit connected with the frequency direct synthesis circuit. The frequency direct synthesis circuit inputs an 80MHz reference source signal and a 960MHz DDS sampling clock signal, controls the frequency direct synthesis circuit to generate a fine frequency standard signal with corresponding frequency according to the signal output by the FPGA control circuit, and outputs a 250-325 MHz fine frequency standard signal after passing through the second switch filter circuit.
Furthermore, the frequency direct synthesis circuit adopts a direct digital frequency synthesizer DDS, specifically adopts a DDS with the model of AD9912, is a 14-bit direct digital frequency synthesizer, has the output frequency of up to 400MHz, supports 48bit frequency words, has the frequency resolution of up to 4 mu Hz, has the characteristics of high precision, low phase noise and the like, and has the phase noise superior to-133 dBc@1KHz for outputting a 275MHz frequency signal.
The frequency mixing amplifying circuit mainly comprises a frequency mixer and an amplifier which are connected with each other. The frequency mixing amplifying circuit mixes and amplifies three input coarse frequency standard signals of 1520MHz, 1600MHz and 1680MHz and fine frequency standard signals of 250-325 MHz, and sends the signals to the post-processing circuit for processing the signals after mixing.
The post-processing circuit mainly comprises a power detection circuit, a third switch filter circuit, a coupling circuit and a power amplification circuit which are connected in sequence, wherein the output end of the coupling circuit is connected with the power detection circuit. The post-processing circuit filters and amplifies the input mixed signals and outputs a local oscillation signal of 1775 MHz-1975 MHz to the radar system. In addition, the filtered mixed signal outputs a path of signal to the power detection circuit through the coupling circuit, and outputs a detection signal to the FPGA control circuit through the power detection.
Through the analysis, the maximum frequency multiplication frequency of the coarse frequency standard signal is 1680MHz/80 MHz=21, the noise of the reference source signal is about 20log 21=26.5 dB, and the additional noise of the link is about 5dB, so that the phase noise of the coarse frequency standard signal is about-133.5 dBc@1KHz; the phase noise of the fine frequency standard signal is about-133 dBc@1KHz; the coarse frequency standard signal and the fine frequency standard signal are mixed to form a local oscillation signal, the mixing is synthesized into superposition of the two signals, and the additional noise (about 5 dB) of the circuit is considered, so that the phase noise of the local oscillation signal is output to be smaller than-125 dBc@1KHz.
The two local oscillation signal module generates two local oscillation signals through frequency mixing, frequency dividing and frequency doubling of a reference source signal and a clock signal, and outputs a power detection signal through a coupling circuit and a power detection circuit.
Specifically, the two local oscillator signal modules mainly comprise a four-frequency dividing circuit, a five-frequency dividing circuit, a first frequency mixing circuit, a second frequency mixing circuit, a third frequency mixing circuit, a fourth frequency mixing circuit and a filtering amplifying circuit. The first frequency mixing circuit inputs an 80MHz reference source signal and a 20MHz clock signal, and outputs a 100MHz first frequency mixing signal to the second frequency mixing circuit and the third frequency mixing circuit; the second frequency mixing circuit inputs the 80MHz reference source signal and the 100MHz first frequency mixing signal, outputs the 180MHz second frequency mixing signal to the four frequency dividing circuit, and the four frequency dividing circuit outputs the 45MHz frequency dividing signal; the third mixing circuit inputs the 100MHz first mixing signal, the 45MHz frequency division signal and the 145MHz third mixing signal; the frequency-quintupling circuit inputs an 80MHz reference source signal, outputs a 400MHz frequency-doubling signal to the fourth mixing circuit, outputs a two-local-oscillator signal with 545MHz to the radar system after the output signal of the fourth mixing circuit is subjected to signal filtering and power amplification by the filtering amplifying circuit, provides the local-oscillator signal for up-down frequency conversion of a transmitting and receiving channel of the radar, and simultaneously outputs one two-local-oscillator signal to the power detecting circuit for signal power detection.
The control circuit module mainly comprises an FPGA control circuit, a sampling clock of the FPGA control circuit is 80MHz, and receives frequency control and agile control signals from a radar terminal display control, so that the DDS is controlled to generate fine frequency standard signals with corresponding frequencies, meanwhile, the communication interface is used for receiving power detection signals of the clock signal module and the local oscillator module, so that fault information of the system can be effectively judged, and switch control signals are output to the first switch filter circuit, the second switch filter circuit and the third switch filter to control frequency selection output of the switch filter.
The above circuits are all conventional circuits, and the specific circuit structure is not described again.
The radar waveform generator outputs an intermediate frequency signal with the frequency of 30MHz, mixes the intermediate frequency signal with two local oscillation signals generated by the L-band low-phase noise frequency source to 575MHz, and mixes the intermediate frequency signal with a local oscillation signal of 1775 MHz-1975 MHz to generate an L-band radar radio frequency signal of 1200 MHz-1400 MHz.
The L-band low-phase noise frequency source of the invention has the following technical indexes:
and (3) local oscillation signals: l band 1775 MHz-1975 MHz;
two local oscillation signals: 545MHz;
clock signal: 20MHz;
frequency interval: 41;
frequency hopping time interval: 2 mus;
phase noise: better than-125 dBc@1KHz;
spurious suppression: more than or equal to 70dBc;
harmonic suppression: and (5) the total power is more than or equal to 50dBc.
The invention adopts a frequency synthesis mode combining direct analog synthesis and direct digital synthesis, combines the advantages of the two modes, and ensures that the frequency source has the advantages of lower phase noise, higher output frequency spectrum purity, short frequency hopping time interval, good spurious suppression performance, higher frequency resolution and the like, provides signals with low phase noise for the radar, improves the improvement factor of a radar system and improves the low-altitude small target detection capability of the radar; the modularized design is adopted, the system structure is relatively simple, and the reliability of the system is improved; in addition, the invention adopts a signal self-detection technology, and can realize the monitoring of the output clock and the local oscillation signal through the FPGA control circuit, thereby effectively judging the fault of the system and reducing the maintenance difficulty of the system.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (7)
1. The L-band low-phase-noise frequency source is characterized by mainly comprising a reference source module, a clock signal module, a local oscillator signal module and a control circuit module;
the reference source module generates an 80MHz reference source signal which is respectively output to the clock signal module, the local oscillator signal module and the control circuit module;
the clock signal module mainly comprises a four-frequency dividing circuit, a filter circuit, a coupling circuit and a power detection circuit which are connected in sequence, and is used for realizing four-frequency division of a reference source signal and generating a 20MHz clock signal and a power detection signal of a radar system;
the local oscillation signal module comprises a local oscillation signal module and two local oscillation signal modules; the local oscillator signal module mainly comprises a fine frequency standard module circuit, a coarse frequency standard module circuit, a mixing amplifying circuit and a post-processing circuit, wherein the coarse frequency standard module circuit outputs a sampling clock signal to the fine frequency standard module circuit and a coarse frequency standard signal to the mixing amplifying circuit; the two local oscillation signal module generates two local oscillation signals and a power detection signal through frequency mixing, frequency dividing and frequency doubling of a reference source signal and a clock signal;
the coarse frequency scale module circuit mainly comprises a comb frequency multiplication circuit and a first switch filter circuit connected with the comb frequency multiplication circuit, wherein the first switch filter circuit outputs three coarse frequency scale signals of 1520MHz, 1600MHz and 1680MHz to the mixing amplification circuit and a DDS sampling clock signal of 960MHz to the DDS;
the fine frequency standard module circuit mainly comprises a frequency direct synthesis circuit and a second switch filter circuit connected with the frequency direct synthesis circuit, wherein the frequency direct synthesis circuit inputs an 80MHz reference source signal and a 960MHz DDS sampling clock signal, controls the frequency direct synthesis circuit to generate a fine frequency standard signal with corresponding frequency according to a signal output by the FPGA control circuit, and outputs a 250-325 MHz fine frequency standard signal after passing through the second switch filter circuit;
the control circuit module mainly comprises an FPGA control circuit and is used for controlling the local oscillation signal module to output a frequency signal, receiving a reference source signal and a power detection signal and judging system fault information.
2. The L-band low-phase noise frequency source of claim 1, wherein the reference source module mainly comprises a crystal oscillator signal source and a power divider connected with the crystal oscillator signal source, and the crystal oscillator signal source generates an 80MHz reference source signal and realizes four paths of power division through the power divider.
3. The L-band low phase noise frequency source of claim 2, wherein said crystal oscillator signal source is an anti-vibration low phase noise thermostatic crystal oscillator OXK581D of 80 MHz.
4. The L-band low phase noise frequency source of claim 1, wherein said frequency direct synthesis circuit employs a direct digital frequency synthesizer DDS.
5. The L-band low phase noise frequency source of claim 1, wherein said mixer amplifier circuit comprises primarily a mixer, an amplifier, connected to each other.
6. The L-band low-phase noise frequency source according to claim 1, wherein the post-processing circuit mainly comprises a power detection circuit, a third switch filter circuit, a coupling circuit and a power amplification circuit which are sequentially connected, and an output end of the coupling circuit is connected with the power detection circuit.
7. The L-band low phase noise frequency source of claim 1, wherein said two local oscillator signal modules mainly comprise four-frequency divider circuit, five-time frequency divider circuit, first mixer circuit, second mixer circuit, third mixer circuit, fourth mixer circuit, filter amplifier circuit, coupling circuit, power detection circuit;
the first frequency mixing circuit inputs an 80MHz reference source signal and a 20MHz clock signal, and outputs a 100MHz first frequency mixing signal to the second frequency mixing circuit and the third frequency mixing circuit;
the second frequency mixing circuit inputs the 80MHz reference source signal and the 100MHz first frequency mixing signal, outputs the 180MHz second frequency mixing signal to the four frequency dividing circuit, and the four frequency dividing circuit outputs the 45MHz frequency dividing signal;
the third mixing circuit inputs the 100MHz first mixing signal, the 45MHz frequency division signal and the 145MHz third mixing signal;
the five-time frequency circuit inputs an 80MHz reference source signal and outputs a 400MHz frequency multiplication signal to a fourth frequency mixing circuit, the output signal of the fourth frequency mixing circuit outputs a two local oscillation signal with 545MHz frequency after passing through a filtering amplifying circuit and a coupling circuit, and the coupling circuit outputs one path of two local oscillation signals to the power detection circuit for signal detection.
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| CN110391811A (en) * | 2019-07-29 | 2019-10-29 | 北京无线电测量研究所 | A kind of star frequency source component |
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| CN111130472B (en) * | 2019-12-31 | 2023-08-04 | 西安茂德通讯科技有限公司 | Radar microwave assembly |
| CN112187182B (en) * | 2020-10-22 | 2023-05-23 | 上海航天电子通讯设备研究所 | Space-borne X-frequency-band miniaturized high-order frequency doubling device |
| CN112422123A (en) * | 2020-11-24 | 2021-02-26 | 武汉滨湖电子有限责任公司 | Low-phase noise frequency synthesizer and local oscillator implementation method |
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