CN108933597A - A kind of thin step frequency synthesizer of broadband Low phase noise and frequency combining method - Google Patents
A kind of thin step frequency synthesizer of broadband Low phase noise and frequency combining method Download PDFInfo
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- CN108933597A CN108933597A CN201810857663.3A CN201810857663A CN108933597A CN 108933597 A CN108933597 A CN 108933597A CN 201810857663 A CN201810857663 A CN 201810857663A CN 108933597 A CN108933597 A CN 108933597A
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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
- 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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Abstract
The invention discloses a kind of thin step frequency synthesizer of broadband Low phase noise and synthetic method, device includes controller, analog-digital converter, integrated phase discriminator, analog switch, broadband VCO, coupler, broad band amplifier, frequency mixer, the first low-pass filter, the second low-pass filter, radio frequency amplifier, comb spectrum generator and crystal oscillator；The thin step frequency synthesizer of broadband Low phase noise and frequency combining method combine comb spectrum generator and PLL, utilize the selecting frequency characteristic and division function of PLL, not only it had realized broadband but also can accomplish ultralow phase noise, it realizes thin stepping ability again in the case where not using DDS simultaneously, can realize the thin stepping of broadband Low phase noise and small in size low in energy consumption simultaneously.
Description
Technical field
The present invention relates to frequency microwave frequency source technical field more particularly to a kind of thin step frequency synthesis of broadband Low phase noise
Device and frequency combining method.
Background technique
Frequency synthesizer is one of the critical component of microwave radio frequency conversion component, is widely used in radar, detects receipts, wireless prison
In survey and communication system.It is higher and higher to receiver sensitivity, resolution requirement recently as the deterioration of electromagnetic environment,
And frequency synthesizer directly affects the index, therefore modern communications are to the performance such as phase noise, frequency of frequency synthesizer
Rate stepping etc., it was also proposed that higher requirement.Broadband frequency synthesizer relies primarily on mixing at present or frequency multiplication mode expands band
Width, this method, which usually requires a large amount of filter, leads to that volume is big, power consumption is high；The realization of conventional thin stepping relies primarily on DDS, and
DDS is limited by device, and usual output frequency is not high, and bandwidth is not wide, and the frequency source of Low phase noise generallys use simulation direct synthesis technique such as
Comb spectrum generator, PDRO etc. usually can not thin stepping, and thin stepping is wanted then to need to combine DDS, it is conventional to realize the thin Step Frequency in broadband
Rate synthesizer is at bulky, power consumption height.
Summary of the invention
The object of the invention is that providing a kind of thin step frequency synthesis of broadband Low phase noise to solve the above-mentioned problems
Device and frequency combining method.
The present invention through the following technical solutions to achieve the above objectives:
A kind of thin step frequency synthesizer of broadband Low phase noise, including controller, analog-digital converter, integrated phase discriminator, simulation
Switch, the amplification of broadband VCO, coupler, broad band amplifier, frequency mixer, the first low-pass filter, the second low-pass filter, radio frequency
Device, comb spectrum generator and crystal oscillator；
The preset voltage output end of the digital analog converter is electrically connected with the input terminal of the analog switch, and the simulation is opened
The output end of pass is electrically connected with the input terminal of the broadband VCO, and the output end of the broadband VCO is after coupler coupling
The output end of the synthesizer；
Local oscillation signal input terminal of the coupled end of the coupler after broad band amplifier amplification with the frequency mixer
Electrical connection, the intermediate-freuqncy signal output end of the frequency mixer by second low-pass filter and the radio frequency amplifier with it is described
The reference input electrical connection of integrated phase discriminator；
The input with the VCO feedback end of the integrated phase discriminator and the comb spectrum generator respectively of the output end of the crystal oscillator
The output end of end electrical connection, the comb spectrum generator is electrically connected with the reference signal end of the frequency mixer；
The input that the voltage output end of the integrated phase discriminator passes through first low-pass filter and the analog switch
End electrical connection；
The controller respectively with the digital analog converter, the analog switch, the crystal oscillator, the integrated phase discriminator and
The control terminal electrical connection of the comb spectrum generator.
A kind of frequency combining method based on said frequencies synthesizer, comprising the following steps:
S1, controller require the frequency of output according to instruction, calculate the preset voltage of digital analog converter output；
Initial voltage of the voltage that S2, controller control analog switch select digital analog converter to export as broadband VCO, it is wide
Band VCO exports initial oscillation Fout0；
The initial oscillation of S3, broadband VCO output is used as output signal F after coupler couplesout, the coupling of coupler
It closes end and exports local oscillation signal through broad band amplifier；
S4, crystal oscillator export reference frequency F0, comb spectrum generator output signal nF under crystal oscillator excitation0, and passed through with local oscillation signal
Intermediate-freuqncy signal F is exported after crossing frequency mixer frequency conversionIF=Fout-nF0；
S5, intermediate-freuqncy signal are input to integrated phase discriminator after the second low-pass filter and radio frequency amplifier filter and amplification
Reference input, crystal oscillator export reference frequency F0To the VCO feedback end of integrated phase discriminator, integrates phase discriminator and two paths of signals is carried out
Phase demodulation exports DC voltage, and filters out high frequency section by the first low-pass filter and export phase demodulation voltage；
S6, controller control analog switch select phase demodulation voltage as the tuning voltage of broadband VCO, and close analog-to-digital conversion
The output of device；
S7, locking system, the frequency of oscillation that broadband VCO is exported areN is the frequency dividing of integrated phase discriminator
Value, n is natural number.
Further, when needs update output frequency of oscillation FnewWhen:
If Fnew-Fout< F0, the configuration of the frequency division value N of the integrated phase discriminator of controller update；
If Fnew-Fout> nF0, controller recalculates the output of digital analog converter, and repeats step S1-S7.
The beneficial effects of the present invention are:
A kind of thin step frequency synthesizer of broadband Low phase noise of the present invention and frequency combining method will comb spectrum generator and PLL phase
In conjunction with not only having realized broadband but also can accomplish ultralow phase noise, while not had using the selecting frequency characteristic and division function of PLL
Having in the case where using DDS realizes thin stepping ability again, can realize the thin stepping of broadband Low phase noise and small in size low in energy consumption simultaneously.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of the thin step frequency synthesizer of broadband Low phase noise of the present invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings:
As shown in Figure 1, a kind of thin step frequency synthesizer of broadband Low phase noise of the present invention, including controller 1, analog-digital converter
2, phase discriminator 4, analog switch 6, broadband VCO7, coupler 8, broad band amplifier 9, frequency mixer 10, the first low-pass filter are integrated
5, the second low-pass filter 11, radio frequency amplifier 12, comb spectrum generator 3 and crystal oscillator 7；
The preset voltage output end of digital analog converter is electrically connected with the input terminal of analog switch 6, the output end of analog switch 6
It is electrically connected with the input terminal of broadband VCO7, the output end of broadband VCO7 is the output end of synthesizer after the coupling of coupler 8；
The coupled end of coupler 8 is electrically connected after the amplification of broad band amplifier 9 with the local oscillation signal input terminal of frequency mixer 10, is mixed
The intermediate-freuqncy signal output end of frequency device 10 is defeated by the second low-pass filter 11 and radio frequency amplifier 12 and the reference of integrated phase discriminator 4
Enter 14 electrical connection of end；
Input terminal of the output end of crystal oscillator 7 respectively with the VCO feedback end 15 of integrated phase discriminator 4 and comb spectrum generator 3 is electrically connected
It connects, the output end of comb spectrum generator 3 is electrically connected with the reference signal end of frequency mixer 10；
The voltage output end of integrated phase discriminator 4 is electrically connected by the first low-pass filter 5 with the input terminal of analog switch 6；
The control with digital analog converter, analog switch 6, crystal oscillator 7, integrated phase discriminator 4 and comb spectrum generator 3 respectively of controller 1
End electrical connection processed, controller 1 can be single-chip microcontroller and be also possible to FPGA or other existing control chips.
The frequency combining method realized by said frequencies synthesizer, comprising the following steps:
(1) pre-output
Controller 1 requires the frequency of output according to instruction, calculates the preset voltage of digital analog converter output；
Controller 1 controls analog switch 6 and selects initial voltage of the voltage of digital analog converter output as broadband VCO7, wide
Band VCO7 exports initial oscillation Fout0；
(2) integrated phase discriminator 4 is configured
The initial oscillation of broadband VCO7 output is used as output signal F after the coupling of coupler 8out, the coupling of coupler 8
It closes end and exports local oscillation signal through broad band amplifier 9；
Crystal oscillator 7 exports reference frequency F0, comb spectrum generator 3 output signal nF under the excitation of crystal oscillator 70, and passed through with local oscillation signal
Intermediate-freuqncy signal F is exported after crossing 10 frequency conversion of frequency mixerIF=Fout-nF0, n is natural number；
Intermediate-freuqncy signal is input to integrated phase discriminator 4 after 12 filter and amplification of the second low-pass filter 11 and radio frequency amplifier
Reference input 14, crystal oscillator 7 export reference frequency F0To the VCO feedback end 15 of integrated phase discriminator 4, phase discriminator 4 is integrated to two
Road signal carries out phase demodulation, exports DC voltage, and filter out high frequency section by the first low-pass filter 5 and export phase demodulation voltage；
(3) switch voltage input source
Controller 1 controls analog switch 6 and selects phase demodulation voltage as the tuning voltage of broadband VCO7, and closes analog-to-digital conversion
The output of device 2；
Locking system, the frequency of oscillation that broadband VCO7 is exported areIt is able to achievePole
Small stepping, N are the frequency division value of integrated phase discriminator 4；
(4) output frequency is updated
Frequency of oscillation F is exported when needing to updatenewWhen:
If Fnew-Fout< F0, the configuration of the frequency division value N of the integrated phase discriminator 4 of the update of controller 1；
If Fnew-Fout> nF0, controller 1 recalculates the output of digital analog converter, and repeats the above steps.
The present invention combines the advantages of comb spectrum generator 3 and phaselocked loop to realize broadband Low phase noise in the case where no DDS
Thin step frequency synthesizer, while volume and power consumption are reduced, a large amount of bandpass filter is not needed in the present invention, is made full use of
The filtering characteristic of phaselocked loop itself is completed to spuious control, in combination with the excellent noiseproof feature of comb spectrum generator 3, so that this
The relatively traditional mode of invention has better performance and lower cost and reliability, can further decrease the ruler of equipment
It is very little, thus the present invention have the advantages that it is small in size.Biography is reduced since the present invention is mixed by comb spectrum generator 3 with broadband VCO7
The frequency multiplication number of system PLL, therefore there is very high phase noise level.
The present invention is different from traditional PLL, it is characterised in that the present invention is by 15 mouthfuls traditional of VCO feedback end and reference input
14 mouthfuls of end is exchanged, i.e., by traditional 14 mouthfuls of connection VCO feed back inputs of reference input, by traditional VCO feed back input port
It is connected to reference-input signal, so that traditional phaselocked loop is cleverly become frequency divider, is realizedThin Step Frequency
Rate.
The limitation that technical solution of the present invention is not limited to the above specific embodiments, it is all to do according to the technique and scheme of the present invention
Technology deformation out, falls within the scope of protection of the present invention.
Claims (3)
1. a kind of thin step frequency synthesizer of broadband Low phase noise, it is characterised in that: including controller, analog-digital converter, integrated mirror
Phase device, analog switch, broadband VCO, coupler, broad band amplifier, frequency mixer, the first low-pass filter, the second low-pass filter,
Radio frequency amplifier, comb spectrum generator and crystal oscillator；
The preset voltage output end of the digital analog converter is electrically connected with the input terminal of the analog switch, the analog switch
Output end is electrically connected with the input terminal of the broadband VCO, and the output end of the broadband VCO is described after coupler coupling
The output end of synthesizer；
The coupled end of the coupler is electrically connected after broad band amplifier amplification with the local oscillation signal input terminal of the frequency mixer
It connects, the intermediate-freuqncy signal output end of the frequency mixer is integrated by second low-pass filter and the radio frequency amplifier with described
The reference input of phase discriminator is electrically connected；
The output end of the crystal oscillator is electric with the input terminal of the VCO feedback end of the integrated phase discriminator and the comb spectrum generator respectively
The output end of connection, the comb spectrum generator is electrically connected with the reference signal end of the frequency mixer；
The voltage output end of the integrated phase discriminator passes through the input terminal of first low-pass filter and analog switch electricity
Connection；
The controller respectively with the digital analog converter, the analog switch, the crystal oscillator, the integrated phase discriminator and described
The control terminal electrical connection of comb spectrum generator.
2. a kind of frequency combining method based on said frequencies synthesizer, it is characterised in that: the following steps are included:
S1, controller require the frequency of output according to instruction, calculate the preset voltage of digital analog converter output；
Initial voltage of the voltage that S2, controller control analog switch select digital analog converter to export as broadband VCO, broadband
VCO exports initial oscillation Fout0；
The initial oscillation of S3, broadband VCO output is used as output signal F after coupler couplesout, the coupled end of coupler
Local oscillation signal is exported through broad band amplifier；
S4, crystal oscillator export reference frequency F0, comb spectrum generator output signal nF under crystal oscillator excitation0, and with local oscillation signal through overmulling
Intermediate-freuqncy signal F is exported after frequency device frequency conversionIF=Fout-nF0；
S5, intermediate-freuqncy signal are input to the reference of integrated phase discriminator after the second low-pass filter and radio frequency amplifier filter and amplification
Input terminal, crystal oscillator export reference frequency F0To the VCO feedback end of integrated phase discriminator, integrated phase discriminator reflects to two paths of signals
Phase exports DC voltage, and filters out high frequency section by the first low-pass filter and export phase demodulation voltage；
S6, controller control analog switch select phase demodulation voltage as the tuning voltage of broadband VCO, and close analog-digital converter
Output；
S7, locking system, the frequency of oscillation that broadband VCO is exported areN is the frequency division value of integrated phase discriminator, n
For natural number.
3. a kind of frequency combining method based on said frequencies synthesizer according to claim 2, it is characterised in that: when need
Update output frequency of oscillation FnewWhen:
If Fnew-Fout< F0, the configuration of the frequency division value N of the integrated phase discriminator of controller update；
If Fnew-Fout> nF0, controller recalculates the output of digital analog converter, and repeats step S1-S7.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110289858A (en) * | 2019-06-27 | 2019-09-27 | 四川众为创通科技有限公司 | A kind of thin stepping frequency agility collaboration system in broadband |
| 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 |
| CN114070308A (en) * | 2022-01-17 | 2022-02-18 | 中国电子科技集团公司第二十九研究所 | Broadband low-phase noise frequency synthesis circuit |
| 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 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289858A (en) * | 2019-06-27 | 2019-09-27 | 四川众为创通科技有限公司 | A kind of thin stepping frequency agility collaboration system in broadband |
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| 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 |
| 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 |
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Application publication date: 20181204 |