CN102013890A - Low-noise broadband frequency-hopping synthesizer - Google Patents
Low-noise broadband frequency-hopping synthesizer Download PDFInfo
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- CN102013890A CN102013890A CN2010102123065A CN201010212306A CN102013890A CN 102013890 A CN102013890 A CN 102013890A CN 2010102123065 A CN2010102123065 A CN 2010102123065A CN 201010212306 A CN201010212306 A CN 201010212306A CN 102013890 A CN102013890 A CN 102013890A
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Abstract
The invention discloses a low-noise broadband frequency-hopping synthesizer, which adopts an interpolating frequency-mixing phase lock loop to reduce a frequency dividing ratio. The interpolating frequency-mixing phase lock loop divides reference source signals into two paths by a power divider to be respectively provided for a phase detection discriminator A and a phase detection discriminator B; the phase detection discriminator B, a low pass filter N, a voltage-controlled oscillator Q and a frequency divider constitute an interpolating local oscillator PLL; the interpolating local oscillator PLL provides point-frequency local-oscillation signals to perform down-conversion with the output of the frequency synthesizer; and the down-conversion performs output feedback to reduce the frequency dividing ratio and phase noise through the phase detection discriminator A. The low-noise broadband frequency-hopping synthesizer has the advantages of low noise, wide frequency range, high frequency-hopping speed, simple debugging and low cost.
Description
Technical field
The present invention relates to the frequency synthesizer in a kind of wireless communication system, be specially adapted to the low noise wide interval frequency hopping frequency synthesizer in the microwave high-speed frequency-hopping communication.
Background technology
Frequency synthesizer is extensively applied to fields such as communication, remote sensing, national defence.Along with further developing of technology, more and more higher to frequency hopping speed, the frequency hopping bandwidth requirement of frequency synthesizer.And in the requirement of satisfying frequency hopping speed, frequency hopping bandwidth, be difficult to take into account simultaneously the phase noise of frequency synthesizer.
In order to realize 1GHz frequency hopping bandwidth, 10MHz stepped-frequency interval, and fast frequency-hopped in order to satisfy simultaneously, the ratio broad that loop bandwidth need be done, so one adopts the integral frequency divisioil phase-locked loop circuit of 10MHz phase demodulation, theory diagram is as shown in Figure 1.So, the phase noise of frequency synthesizer output will worsen 20*log10 (N) dB than reference signal, and wherein N is the phase-locked loop feedback frequency dividing ration.When output frequency higher, as when being 9-10GHz, N=900-1000, phase noise is the poorest will to worsen 60dB.The requirement of the communication system of low-noise performance and such noise penalty can't meet the demands.
Summary of the invention
Technical problem to be solved by this invention be to provide that a kind of low noise, cost are low, wide frequency range, fast, the simple low noise wide interval frequency hopping frequency synthesizer of debugging of frequency hopping speed.
In order to solve above technical problem, the invention provides a kind of low noise wide interval frequency hopping frequency synthesizer, adopt interpolation mixing phase-locked loop to reduce frequency dividing ratio.
Described interpolation mixing phase-locked loop, be that reference source signal is divided into two-way through power splitter, offer phase frequency detector A and phase frequency detector B respectively, phase frequency detector B and low pass filter N, voltage controlled oscillator Q and frequency divider constitute interpolation local oscillator PLL, the interpolation local oscillator PLL provide the spot-frequency local oscillation signal, carry out down-conversion with the output of frequency synthesizer, down-conversion output feedback reaches the purpose that reduces frequency dividing ratio and reduce phase noise through phase frequency detector A.
Superior effect of the present invention is:
1) the present invention does not reduce under the condition of frequency hopping speed not changing output frequency hopping bandwidth, stepped-frequency interval simultaneously, reduces the frequency dividing ratio N in the phase-locked loop;
2) the present invention have that noise is low, wide frequency range, frequency hopping speed is fast, debugging is simple, cost is low advantage.
Description of drawings
Fig. 1 is the functional-block diagram of conventional frequency synthesizer;
Fig. 2 is a functional-block diagram of the present invention;
The number in the figure explanation
The 1-reference source; The 2-power splitter;
3-phase frequency detector A; 4-low pass filter M;
5-voltage controlled oscillator P; The 6-frequency mixer;
The 7-filter; 8-phase frequency detector B;
9-low pass filter N; 10-voltage controlled oscillator Q;
The 11-frequency divider.
Embodiment
See also shown in the accompanying drawing, the invention will be further described.
As described in Figure 2, the invention provides a kind of low noise wide interval frequency hopping frequency synthesizer, adopt interpolation mixing phase-locked loop to reduce frequency dividing ratio.
Described interpolation mixing phase-locked loop, be that reference source 1 signal is divided into two-way through power splitter 2, offer phase frequency detector A3 and phase frequency detector B8 respectively, phase frequency detector B8 and low pass filter N9, voltage controlled oscillator Q10 and frequency divider 11 constitute interpolation local oscillator PLL, the interpolation local oscillator PLL provide the spot-frequency local oscillation signal, carry out down-conversion with the output of frequency synthesizer, down-conversion output feedback reaches the purpose that reduces frequency dividing ratio and reduce phase noise through phase frequency detector A3.
The output f1 of voltage controlled oscillator Q10 provides local oscillator for frequency mixer 6.The output f2 of voltage controlled oscillator 5P and the output f1 of voltage controlled oscillator 10Q carry out down-frequency conversion by frequency mixer 6, by filter 7, filter out unnecessary mixed product after, give phase frequency detector 3A.After phase frequency detector 3A carries out frequency division in inside, carry out bit comparison mutually with reference signal, by charge pump output pulse current, pulse current discharges and recharges and filtering through low pass filter 4M, provides pure direct-current control voltage to voltage controlled oscillator 5P.The broadband local oscillation signal that the output f2 of voltage controlled oscillator 5P produces for this frequency synthesizer.
When output frequency is the 9-10GHz signal, adopt circuit theory of the present invention, interpolation local oscillator PLL output frequency is 8GHz, feedback frequency dividing ration N=100-200, then frequency synthesizer output phase noise is the poorest will worsen 20*log10 (200)=46dB.Have clear improvement than conventional frequency synthesizer, more can satisfy of the requirement of low noise communication system phase noise.
Claims (2)
1. low noise wide interval frequency hopping frequency synthesizer is characterized in that:
Adopt interpolation mixing phase-locked loop to reduce frequency dividing ratio.
2. by the described low noise wide interval frequency hopping frequency synthesizer of claim 1, it is characterized in that:
Described interpolation mixing phase-locked loop, be that reference source signal is divided into two-way through power splitter, offer phase frequency detector A and phase frequency detector B respectively, phase frequency detector B and low pass filter N, voltage controlled oscillator Q and frequency divider constitute interpolation local oscillator PLL, the interpolation local oscillator PLL provide the spot-frequency local oscillation signal, carry out down-conversion with the output of frequency synthesizer, down-conversion output feedback reaches the purpose that reduces frequency dividing ratio and reduce phase noise through phase frequency detector A.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102123065A CN102013890A (en) | 2010-06-29 | 2010-06-29 | Low-noise broadband frequency-hopping synthesizer |
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| CN2010102123065A CN102013890A (en) | 2010-06-29 | 2010-06-29 | Low-noise broadband frequency-hopping synthesizer |
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| CN102013890A true CN102013890A (en) | 2011-04-13 |
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| CN2010102123065A Pending CN102013890A (en) | 2010-06-29 | 2010-06-29 | Low-noise broadband frequency-hopping synthesizer |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324929A (en) * | 2011-04-22 | 2012-01-18 | 中国科学院上海微***与信息技术研究所 | Hopping frequency synthesizer for front end of millimeter wave holographic imaging system |
| CN103532586A (en) * | 2013-07-26 | 2014-01-22 | 熊猫电子集团有限公司 | Four-channel short wave receiving and sending unit based on Ethernet bus |
| CN104052947A (en) * | 2013-03-13 | 2014-09-17 | 硅实验室公司 | Multi-tuner using interpolative dividers |
| CN104601170A (en) * | 2014-11-28 | 2015-05-06 | 中国电子科技集团公司第二十九研究所 | Fast phase locked loop circuit |
| 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 |
| CN108988857A (en) * | 2018-10-19 | 2018-12-11 | 贵州航天计量测试技术研究所 | A kind of broadband low phase noise frequency synthesizer and method based on optical-electronic oscillator |
| CN112152610A (en) * | 2020-09-22 | 2020-12-29 | 西安交通大学 | Phase-locked loop with broadband rapid frequency hopping function |
| US11606106B2 (en) | 2018-12-19 | 2023-03-14 | Silicon Laboratories Inc. | System, apparatus and method for concurrent reception of multiple channels spaced physically in radio frequency spectrum |
-
2010
- 2010-06-29 CN CN2010102123065A patent/CN102013890A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324929A (en) * | 2011-04-22 | 2012-01-18 | 中国科学院上海微***与信息技术研究所 | Hopping frequency synthesizer for front end of millimeter wave holographic imaging system |
| CN104052947A (en) * | 2013-03-13 | 2014-09-17 | 硅实验室公司 | Multi-tuner using interpolative dividers |
| CN104052947B (en) * | 2013-03-13 | 2017-08-01 | 硅实验室公司 | Use the multi-tuner of interpolation frequency divider |
| CN103532586A (en) * | 2013-07-26 | 2014-01-22 | 熊猫电子集团有限公司 | Four-channel short wave receiving and sending unit based on Ethernet bus |
| CN104601170A (en) * | 2014-11-28 | 2015-05-06 | 中国电子科技集团公司第二十九研究所 | Fast phase locked loop circuit |
| 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 |
| CN108988857A (en) * | 2018-10-19 | 2018-12-11 | 贵州航天计量测试技术研究所 | A kind of broadband low phase noise frequency synthesizer and method based on optical-electronic oscillator |
| CN108988857B (en) * | 2018-10-19 | 2023-07-07 | 贵州航天计量测试技术研究所 | Broadband low-phase-noise frequency synthesizer and method based on photoelectric oscillator |
| US11606106B2 (en) | 2018-12-19 | 2023-03-14 | Silicon Laboratories Inc. | System, apparatus and method for concurrent reception of multiple channels spaced physically in radio frequency spectrum |
| CN112152610A (en) * | 2020-09-22 | 2020-12-29 | 西安交通大学 | Phase-locked loop with broadband rapid frequency hopping function |
| CN112152610B (en) * | 2020-09-22 | 2023-06-16 | 西安交通大学 | Phase-locked loop with broadband rapid frequency hopping function |
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Application publication date: 20110413 |