CN105429641A - Lock protection type high-performance broadband microwave frequency synthesizer - Google Patents
Lock protection type high-performance broadband microwave frequency synthesizer Download PDFInfo
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- CN105429641A CN105429641A CN201510943260.7A CN201510943260A CN105429641A CN 105429641 A CN105429641 A CN 105429641A CN 201510943260 A CN201510943260 A CN 201510943260A CN 105429641 A CN105429641 A CN 105429641A
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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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Abstract
The invention discloses a lock protection type high-performance broadband microwave frequency synthesizer. The lock protection type high-performance broadband microwave frequency synthesizer comprises a constant-temperature crystal oscillator, a power divider, an analogue frequency doubling circuit, a DDS, a phase discriminator and a broadband VCO connected sequentially; the power divider is also connected to a comb spectrum generator and a broadband double-balance frequency mixer sequentially; the broadband VCO is connected to a second directional coupler, a second microwave amplifier, the broadband double-balance frequency mixer and a low-pass filter sequentially; the low-pass filter is connected to the phase discriminator, such that a closed ring is formed; the phase discriminator is connected to a second loop filter; the second loop filter is connected to the second branch of a single-pole double-throw switch; an FPGA is respectively connected with the DDS and the single-pole double-throw switch; the circuit forms a frequency synthesis circuit; and a phase-locked loop lock protection circuit is connected to the synthesis circuit. According to the invention, the DDS is used as a broadband phase-locked loop reference signal; the comb spectrum generator is used as a offset source; and thus, the frequency synthesizer, which is low in circuit complex degree, wide in frequency band, high in frequency resolution, low in phase noise and low in spurious suppression, can be realized.
Description
Technical field
The invention belongs to frequency synthesizer, be specifically related to a kind of error lock prevention high performance wideband Microwave Frequency Synthesizer.
Background technology
Realize high performance wide-band microwave frequency synthesizer, need the comprehensive multi-frequency synthesis mode that adopts to realize.Wide-band microwave frequency synthesizer in the past is is always accepted or rejected between the key indexs such as output bandwidth, frequency resolution, spurious reduction, phase noise, complexity in circuits, is difficult to take into account all indexs comprehensively.In addition, broadband high resolution frequency combiner circuit generally all needs phase-locked loop Lock protection circuit.Traditional phase-locked loop Lock protection circuit is the method adopting preset voltage, its implementation is the voltage-frequency characteristic according to VCO, utilizing digital to analog converter to export the voltage-controlled end of corresponding preset voltage to VCO, by VCO traction to needing near locking frequency, reaching the object preventing phase-locked loop mistake lock.There is following defect in this Lock protection circuit: first, because the voltage-controlled sensitivity of broadband VCO is very high, be generally about 500MHz/V, VCO output frequency is very responsive to tuning voltage, and the voltage-frequency characteristic between same model VCO exists individual difference, adopt the mode of this open loop of preset voltage to draw VCO frequency, its precision is not high, consistency is poor, sometimes even can not realize the object of error lock prevention; Secondly, realizing the analog to digital converter that preset voltage exports is digital device, due to digital device work time, easily higher to electromagnetic environment requirements phase-locked loop circuit causes interference, the spectral purity that impact outputs signal.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of error lock prevention high performance wideband Microwave Frequency Synthesizer, stability and good reliability, and Electro Magnetic Compatibility is better, to solve prior art Problems existing.
The technical scheme that the present invention takes is: a kind of error lock prevention high performance wideband Microwave Frequency Synthesizer, comprise the constant-temperature crystal oscillator connected successively, power splitter, simulation frequency multiplier circuit, DDS, phase discriminator and width VCO, power splitter branch road two is also connected to comb spectrum generator and broadband double balanced mixer successively, broadband VCO output connects directional coupler two successively, microwave amplifier two and broadband double balanced mixer, double balanced mixer medium frequency output end is connected to low pass filter, low pass filter output is connected to phase discriminator radio-frequency (RF) signal input end, phase detector error voltage output end is connected to the input of loop filter two, loop filter two is connected to the branch road two of single-pole double-throw switch (SPDT), FPGA control signal wire is connected with DDS control end, the output signal of FPGA control circuit is connected to the control end of single-pole double-throw switch (SPDT), this circuit forms frequency synthesizer circuit, frequency synthesizer circuit is connected with phase-locked loop Lock protection circuit.
Preferably, above-mentioned phase-locked loop Lock protection circuit comprises the Zhong Zhen connected successively, fractional frequency division phase discriminator, loop filter one, the branch road one of single-pole double-throw switch (SPDT), broadband VCO, directional coupler one and microwave amplifier one, microwave amplifier one backspace is connected to little tree frequency division phase discriminator and forms closed loop, the control end of fractional frequency division phase discriminator is connected to FPGA control circuit output signal end, fractional-N PLL circuit is realized the Novel error-proofing lock circuit of closed loop error lock prevention, this novel phase-locked loop Lock protection circuit is due to its closed loop characteristic, the impact of same model broadband VCO voltage-frequency characteristic individual difference can not be subject to, frequency pulling precision can be realized high, excellent properties is waited to output signal spectrum impurities affect is little.
Beneficial effect of the present invention: compared with prior art, the present invention adopts DDS as broadband phase-looked loop reference signal and the comb spectrum generator mode as offset source, by the high frequency resolution characteristic of DDS, the low phase noise characteristic of comb spectrum generator and the narrow-band filtering characteristic of phase-locked loop circuit combine, achieve complexity in circuits low, broadband, high frequency resolution, low phase noise, the frequency synthesizer that low spurious suppresses, in addition, adopt this new paragon of Lock protection circuit of closed loop, solve existing open loop Lock protection circuit Electro Magnetic Compatibility poor, the problems such as frequency pulling precision is not high.
Accompanying drawing explanation
Fig. 1 is that circuit theory of the present invention connects block diagram.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, invention is described further.
Embodiment 1: as shown in Figure 1, a kind of error lock prevention high performance wideband Microwave Frequency Synthesizer, comprise constant-temperature crystal oscillator 18, the output 31 of constant-temperature crystal oscillator 18 is connected to the conjunction terminal of power splitter 17, the output branch road 1 of power splitter 17 is connected to the input of direct modeling frequency multiplier circuit 15, the output of direct modeling frequency multiplier circuit 15 is connected to the reference input of DDS14, the output signal of DDS14 is connected to the reference signal input of phase discriminator 12, the output branch road 2 35 of power splitter 17 is connected to the input of comb spectrum generator 16, the output of comb spectrum generator 16 is connected to the rf inputs of broadband double balanced mixer 10, the signal of broadband VCO5 after directional coupler 28 and microwave amplifier 29 amplify is connected to the local oscillator input of broadband double balanced mixer 10, the medium frequency output end of broadband double balanced mixer 10 is connected to the input of low pass filter 11, the output of low pass filter 11 is connected to the radio-frequency (RF) signal input end of phase discriminator 12, the error voltage output of phase discriminator 12 is connected to the input of loop filter two, the output of loop filter 2 13 is connected to the branch road two of single-pole double-throw switch (SPDT) 4, the control signal wire of FPGA control circuit 19 is connected with the control end of DDS14, form high performance wideband microwave synthesizer circuit, frequency synthesizer circuit is connected with phase-locked loop Lock protection circuit, the output signal of FPGA control circuit 19 is connected to the control end of single-pole double-throw switch (SPDT).
Embodiment 2: in embodiment 1, phase-locked loop Lock protection circuit comprises clock and shakes 1, clock shake 1 output be connected to the reference edge of fractional frequency division phase discriminator 2, the output signal of broadband VCO5 is by being connected to the radio-frequency (RF) signal input end of fractional frequency division phase discriminator 2 after directional coupler 1 and microwave amplifier 1, the charge pump of fractional frequency division phase discriminator 2 exports the branch road one by being connected to single-pole double-throw switch (SPDT) 4 after loop filter 1, single-pole double-throw switch (SPDT) main road is connected to the voltage tuning end of broadband VCO5, the output signal of FPGA control circuit 19 is connected to the control end of fractional frequency division phase discriminator.
Frequency synthesizer controls principle: according to the frequency of required output, be the output frequency that fractional frequency division phase discriminator arranges corresponding frequency dividing ratio and corresponding DDS by FPGA control circuit, during beginning, by FPGA control circuit, single-pole double-throw switch (SPDT) is connected branch road one, the N making broadband VCO lock onto Zhong Zhen doubly goes up (N also can be integer for decimal), according to the setting of FPGA, now broadband VCO output frequency and expection output frequency are closely, after FPGA detects fractional frequency division phase discriminator lock indication signal, by switch connection branch road two, now, by comb spectrum generator as the phase-locked loop of offset source by quick lock in required frequency, achieve the function of error lock prevention.Adopt DDS as the reference signal of broadband phase-looked loop circuit, due to the high frequency resolution characteristic of DDS, the broadband signal of output can be made to have very high frequency resolution, all the other frequency synthesizer circuits except broadband phase-looked loop all adopt direct modeling frequency synthesis mode, the advantage of direct modeling frequency synthesis mode is that the phase noise outputed signal is very low, like this, output broadband signal can be made to obtain excellent phase noise performance, the frequency multiplication number of times of DDS in phase-locked loop is 1, utilize the narrow-band filtering effect of cycle of phase-locked loop filter, excellent spurious reduction index can be obtained, comb spectrum generator is outputed signal the frequency synthesis mode of phase demodulation after mixing as offset source and broadband VCO, broad band performance can be realized.
The above; be only the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace; all should be encompassed within protection scope of the present invention, therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (2)
1. an error lock prevention high performance wideband Microwave Frequency Synthesizer, it is characterized in that: comprise the constant-temperature crystal oscillator connected successively, power splitter, simulation frequency multiplier circuit, DDS, phase discriminator and width VCO, power splitter branch road two is also connected to comb spectrum generator and broadband double balanced mixer successively, broadband VCO output connects directional coupler two successively, microwave amplifier two and broadband double balanced mixer, double balanced mixer medium frequency output end is connected to low pass filter, low pass filter output is connected to phase discriminator radio-frequency (RF) signal input end, phase detector error voltage output end is connected to the input of loop filter two, loop filter two is connected to the branch road two of single-pole double-throw switch (SPDT), FPGA control signal wire is connected with DDS control end, the output signal of FPGA control circuit is connected to the control end of single-pole double-throw switch (SPDT), this circuit forms frequency synthesizer circuit, combiner circuit is connected with phase-locked loop Lock protection circuit.
2. a kind of error lock prevention high performance wideband Microwave Frequency Synthesizer according to claim 1, it is characterized in that: phase-locked loop Lock protection circuit comprises the Zhong Zhen, fractional frequency division phase discriminator, loop filter one, the branch road one of single-pole double-throw switch (SPDT), broadband VCO, directional coupler one and the microwave amplifier one that connect successively, microwave amplifier one backspace is connected to little tree frequency division phase discriminator and forms closed loop, and the control end of fractional frequency division phase discriminator is connected to FPGA control circuit output signal end.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106067815A (en) * | 2016-07-13 | 2016-11-02 | 贵州航天计量测试技术研究所 | A kind of based on DDS with the frequency synthesizer of fractional frequency-division phase-locked loop |
| CN106209096A (en) * | 2016-07-26 | 2016-12-07 | 中国电子科技集团公司第二十九研究所 | A kind of Low phase noise bandwidth frequency synthetic method based on dicyclo mixing and system |
| CN106656049A (en) * | 2016-11-24 | 2017-05-10 | 成都西科微波通讯有限公司 | High performance frequency synthesizer |
| CN106656050A (en) * | 2016-11-24 | 2017-05-10 | 安徽四创电子股份有限公司 | S-waveband octave high-performance frequency synthesizer |
| CN108712171A (en) * | 2018-08-13 | 2018-10-26 | 成都能通科技有限公司 | A kind of frequency synthesizer circuit and its implementation of multiple interpolation hybrid |
| CN108933597A (en) * | 2018-07-31 | 2018-12-04 | 四川众为创通科技有限公司 | A kind of thin step frequency synthesizer of broadband Low phase noise and frequency combining method |
| CN110729996A (en) * | 2019-11-12 | 2020-01-24 | 中电科仪器仪表有限公司 | Phase-locked loop circuit and method for miniaturization double phase locking |
| CN110912555A (en) * | 2019-12-13 | 2020-03-24 | 贵州航天计量测试技术研究所 | Phase-locked loop circuit structure adopting high-speed D/A preset technology |
| CN110995255A (en) * | 2019-12-13 | 2020-04-10 | 贵州航天计量测试技术研究所 | Broadband low-phase-noise phase-locked loop with quick locking function |
| CN111769830A (en) * | 2020-08-06 | 2020-10-13 | 成都凌德科技有限公司 | Broadband local oscillation circuit and local oscillation signal generating method |
| CN113452456A (en) * | 2021-06-10 | 2021-09-28 | 成都华芯天微科技有限公司 | Portable plane near-field test system, method and terminal |
| CN115276832A (en) * | 2021-04-29 | 2022-11-01 | 核工业西南物理研究院 | Multi-point bandwidth frequency band microwave diagnosis system based on double comb-shaped frequencies |
| CN116781070A (en) * | 2023-08-18 | 2023-09-19 | 成都世源频控技术股份有限公司 | Miniaturized point frequency source of high-quality frequency spectrum |
| CN117411478A (en) * | 2023-12-12 | 2024-01-16 | 成都世源频控技术股份有限公司 | Low-phase-noise mixing phase-locked circuit with error-locking prevention function |
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Cited By (21)
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| CN106067815A (en) * | 2016-07-13 | 2016-11-02 | 贵州航天计量测试技术研究所 | A kind of based on DDS with the frequency synthesizer of fractional frequency-division phase-locked loop |
| CN106067815B (en) * | 2016-07-13 | 2023-04-07 | 贵州航天计量测试技术研究所 | Frequency synthesizer based on DDS and fractional frequency division phase-locked loop |
| CN106209096A (en) * | 2016-07-26 | 2016-12-07 | 中国电子科技集团公司第二十九研究所 | A kind of Low phase noise bandwidth frequency synthetic method based on dicyclo mixing and system |
| CN106656049A (en) * | 2016-11-24 | 2017-05-10 | 成都西科微波通讯有限公司 | High performance frequency synthesizer |
| CN106656050A (en) * | 2016-11-24 | 2017-05-10 | 安徽四创电子股份有限公司 | S-waveband octave high-performance frequency synthesizer |
| CN106656050B (en) * | 2016-11-24 | 2023-05-12 | 安徽四创电子股份有限公司 | S-band octave high-performance frequency synthesizer |
| CN108933597A (en) * | 2018-07-31 | 2018-12-04 | 四川众为创通科技有限公司 | A kind of thin step frequency synthesizer of broadband Low phase noise and frequency combining method |
| CN108712171A (en) * | 2018-08-13 | 2018-10-26 | 成都能通科技有限公司 | A kind of frequency synthesizer circuit and its implementation of multiple interpolation hybrid |
| CN108712171B (en) * | 2018-08-13 | 2024-02-02 | 成都能通科技股份有限公司 | Frequency synthesis circuit for repeatedly interpolating mixing rings and implementation method thereof |
| CN110729996A (en) * | 2019-11-12 | 2020-01-24 | 中电科仪器仪表有限公司 | Phase-locked loop circuit and method for miniaturization double phase locking |
| CN110995255A (en) * | 2019-12-13 | 2020-04-10 | 贵州航天计量测试技术研究所 | Broadband low-phase-noise phase-locked loop with quick locking function |
| CN110912555A (en) * | 2019-12-13 | 2020-03-24 | 贵州航天计量测试技术研究所 | Phase-locked loop circuit structure adopting high-speed D/A preset technology |
| CN110995255B (en) * | 2019-12-13 | 2024-01-23 | 贵州航天计量测试技术研究所 | Broadband low-phase-noise phase-locked loop with quick locking function |
| CN111769830A (en) * | 2020-08-06 | 2020-10-13 | 成都凌德科技有限公司 | Broadband local oscillation circuit and local oscillation signal generating method |
| CN115276832A (en) * | 2021-04-29 | 2022-11-01 | 核工业西南物理研究院 | Multi-point bandwidth frequency band microwave diagnosis system based on double comb-shaped frequencies |
| CN115276832B (en) * | 2021-04-29 | 2024-02-09 | 核工业西南物理研究院 | Multi-point frequency broadband microwave diagnosis system based on double comb frequencies |
| CN113452456A (en) * | 2021-06-10 | 2021-09-28 | 成都华芯天微科技有限公司 | Portable plane near-field test system, method and terminal |
| CN116781070B (en) * | 2023-08-18 | 2023-11-07 | 成都世源频控技术股份有限公司 | Miniaturized point frequency source of high-quality frequency spectrum |
| CN116781070A (en) * | 2023-08-18 | 2023-09-19 | 成都世源频控技术股份有限公司 | Miniaturized point frequency source of high-quality frequency spectrum |
| CN117411478A (en) * | 2023-12-12 | 2024-01-16 | 成都世源频控技术股份有限公司 | Low-phase-noise mixing phase-locked circuit with error-locking prevention function |
| CN117411478B (en) * | 2023-12-12 | 2024-04-23 | 成都世源频控技术股份有限公司 | Low-phase-noise mixing phase-locked circuit with error-locking prevention function |
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