CN203896336U - Low-phase-noise frequency synthesizer - Google Patents
Low-phase-noise frequency synthesizer Download PDFInfo
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- CN203896336U CN203896336U CN201420335988.2U CN201420335988U CN203896336U CN 203896336 U CN203896336 U CN 203896336U CN 201420335988 U CN201420335988 U CN 201420335988U CN 203896336 U CN203896336 U CN 203896336U
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Abstract
The utility model discloses a low-phase-noise frequency synthesizer, which comprises a low-phase-noise reference source, a phase discriminator, a loop filter, a high-frequency low-phase-noise oscillator, a power divider, a frequency multiplier, an amplifier and a filter, wherein the input end of the phase discriminator is connected with the output end of the low-phase-noise reference source, and the phase discriminator is provided with a radio frequency input end; the input end of the loop filter is connected with the output end of the phase discriminator; the input end of the high-frequency low-phase-noise oscillator is connected with the output end of the loop filter; the input end of the power divider is connected with the output end of the high-frequency low-phase-noise oscillator, and the power divider is provided with two output ends; the input end of the frequency multiplier is connected with one of the output ends of the power divider; the input end of the amplifier is connected with the output end of the frequency multiplier; the input end of the filter is connected with the output end of the amplifier; the other output end of the power divider is connected with the radio frequency input end of the phase discriminator; and the low-phase-noise reference source, the phase discriminator, the loop filter and the high-frequency low-phase-noise oscillator form a single-loop phase-locked loop. The low-phase-noise frequency synthesizer disclosed by the utility model is reasonable in design and simple in implementation scheme, not only simplifies frequency synthesis of low phase noises, but also can ensure the purity of frequency spectrum.
Description
Technical field
The utility model relates to a kind of frequency synthesizer, and what be specifically related to is a kind of Frequency Synthesizer with Low Phase Noise.
Background technology
Frequency synthesis technique originates from the thirties in last century, and at present, frequency synthesizer has become " heart " of radio frequency microwave system, in the fields such as dual-use communication, navigation, radar and instrument and meter, is all widely used.Along with the development of modern technologies, people are more and more higher to the requirement of frequency synthesizer, and the critical index of frequency synthesizer has often determined the performance of radio frequency microwave system.The particularly phase noise of frequency synthesizer, has directly determined the communication error rate, the detection sensitivity of radar system etc. of communication system therefore, to require frequency synthesizer to have low phase noise characteristic.
At present, conventional frequency synthesis mode has: directly frequency synthesis, frequency synthesis and Direct Digital (DDS) frequency synthesis based on phase-locked loop (PLL).Directly frequency synthesis phase noise characteristic is best, but its scheme complexity, power consumption is large, cost is high; Direct Digital (DDS) frequency synthesizer phase noise is better, but its spuious more and bad elimination; Although it is simpler that conventional phase-locked loop frequency synthetic schemes has scheme, spuious more manageable feature, its phase noise is relatively poor.
Based on this, the patent No. 201320399079.0 and application number 201210058937.5 disclose respectively two kinds of Frequency Synthesizer with Low Phase Noises, the first frequency synthesizer is mixing phase-locking type, the second frequency synthesizer is many ring phase-locking types, and two technical schemes have all been improved the phase noise of frequency synthesizer.But, these two kinds of frequency synthesizers are that the mixing mode phase-locked with multifrequency carried out the low frequency synthesis of making an uproar mutually due to what adopt respectively, thereby implementation is still comparatively complicated, cost drops into larger, and the structural design of the two make its in improving phase noise due to the repeatedly cause of frequency division of phase discriminator, also cause the generation of spurious signal, caused spectral purity to reduce.
Utility model content
The purpose of this utility model is to provide a kind of Frequency Synthesizer with Low Phase Noise, mainly solves existing Frequency Synthesizer with Low Phase Noise and has implementation complexity, problem that spectral purity is low.
To achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of Frequency Synthesizer with Low Phase Noise, comprise the low a reference source of making an uproar mutually, and input is connected with this low a reference source output of making an uproar mutually, and there is the phase discriminator of rf inputs, also comprise the loop filter that input is connected with phase discriminator output, the low oscillator of making an uproar mutually of high frequency that input is connected with this loop filter output, input is connected with the low oscillator output end of making an uproar mutually of this high frequency, and there is the power splitter of two outputs, the frequency multiplier that input is connected with one of them output of this power splitter, the amplifier that input is connected with this frequency multiplier output, and the filter that is connected with this amplifier out of input, another output of described power splitter is connected with the rf inputs of phase discriminator, the described low a reference source of making an uproar mutually forms single loop phase locked loop with the low oscillator of making an uproar mutually of phase discriminator, loop filter and high frequency.
Further, the described low a reference source of making an uproar is mutually constant-temperature crystal oscillator, and its frequency is less than or equal to 100MHz.
Again further, the low oscillator of making an uproar mutually of described high frequency is constant temperature sound table oscillator, and its operating frequency is more than or equal to 1GHz.
Compared with prior art, the utlity model has following beneficial effect:
(1) the utility model is reasonable in design, and its structure is phase-locked phase-locked more simple in structure with mixing than existing multifrequency.
(2) the utility model is provided with the low oscillator of making an uproar mutually of high frequency, it has formed single loop phase locked loop with low a reference source and phase discriminator, the loop filter of making an uproar mutually, the semaphore lock of single loop phase locked loop output is made an uproar on oscillator output frequency mutually in high frequency is low, it is the first order high-frequency signal that phase-locked output has the low characteristic of making an uproar mutually, then by power splitter, low phase noise high-frequency signal is incorporated in phase discriminator and carries out phase-contrast with follow-up low canonical reference signal source of making an uproar mutually a reference source output, thereby reduced due to phase demodulation and the repeatedly deterioration of frequency division to signal noise; And the utility model adopts frequency multiplier to carry out frequency multiplication to the low high-frequency signal of making an uproar mutually of single loop phase locked loop output, can reduce high power frequency number, reduce again the deterioration of frequency multiplication to phase noise, finally again by amplifier and filter process, eliminate spurious signal, make the utility model in carrying out the low frequency synthesis of making an uproar mutually, ensured spectral purity.The utility model is by rational design, realize well the frequency synthesis of low phase noise, it is compared, and existing mixing is phase-locked to be compared with many rings phase-lock mode, the frequency synthesis scheme of not only having simplified low phase noise, has reduced cost and power consumption, and has improved equally phase noise, and produce hardly spurious signal, ensured spectral purity, therefore, it has significantly optimized the performance of frequency synthesizer.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail, and execution mode of the present utility model includes but not limited to the following example.
Embodiment
As shown in Figure 1, the utility model comprises low oscillator, power splitter, frequency multiplier, amplifier and the filter of making an uproar mutually of the low a reference source of making an uproar mutually, phase discriminator, loop filter, high frequency that input/output terminal connects successively.Described phase discriminator also has rf inputs, and described power splitter has two outputs, and except above-mentioned output is connected with frequency multiplier input, another output of this power splitter is connected with the rf inputs of phase discriminator.
Operation principle of the present utility model is as follows:
In the utility model, the low a reference source of making an uproar mutually forms single loop phase locked loop with the low oscillator of making an uproar mutually of phase discriminator, loop filter and high frequency, the signal of single loop phase locked loop output is locked in that high frequency is low makes an uproar on oscillator mutually, and obtain the low characteristic of making an uproar mutually of high-frequency generator output signal, then to the low phase noise cancellation signal of power splitter (also can adopt coupler) output high frequency, in the present embodiment, single loop phase locked loop output frequency is not less than the high frequency Low Phase Noise Signal of 1GHz.
Power splitter receives after signal, be divided into two-way output, one tunnel outputs in phase discriminator, carry out phase-contrast with low canonical reference signal of making an uproar mutually a reference source output, reduce follow-up frequency division number of times, as preferably, in the present embodiment, the low a reference source of making an uproar is mutually selected constant-temperature crystal oscillator, and its frequency is less than or equal to 100MHz.
Another road of power splitter outputs in frequency multiplier, and carries out the frequency multiplication of low number of times according to the size of output signal, obtains low phase noise cancellation signal, finally after amplifier and filter elimination spurious signal, exports again.
And in order to obtain better the low phase noise characteristic of the low oscillator of making an uproar mutually of high frequency, and reducing frequency multiplication number of times, in the present embodiment, the low oscillator of making an uproar mutually of high frequency is selected constant temperature sound table oscillator, and its operating frequency is more than or equal to 1GHz.
The utility model has adopted the ripe control appliance of existing application, and combines by reasonable manner, thereby makes frequency synthesizer have the well low characteristic of making an uproar mutually, has significantly optimized the performance of frequency synthesizer.
Above-described embodiment is only preferably one of implementation of the utility model; should not be used for limiting protection range of the present utility model; all changes of having no essential meaning of making under body design thought of the present utility model and spirit or the technical scheme of polishing; the technical problem of its solution is consistent with the utility model in fact, all should be within protection range of the present utility model.
Claims (3)
1. a Frequency Synthesizer with Low Phase Noise, comprise the low a reference source of making an uproar mutually, and input is connected with this low a reference source output of making an uproar mutually, and there is the phase discriminator of rf inputs, it is characterized in that: also comprise the loop filter that input is connected with phase discriminator output, the low oscillator of making an uproar mutually of high frequency that input is connected with this loop filter output, input is connected with the low oscillator output end of making an uproar mutually of this high frequency, and there is the power splitter of two outputs, the frequency multiplier that input is connected with one of them output of this power splitter, the amplifier that input is connected with this frequency multiplier output, and the filter that is connected with this amplifier out of input, another output of described power splitter is connected with the rf inputs of phase discriminator, the described low a reference source of making an uproar mutually forms single loop phase locked loop with the low oscillator of making an uproar mutually of phase discriminator, loop filter and high frequency.
2. a kind of Frequency Synthesizer with Low Phase Noise according to claim 1, is characterized in that: the described low a reference source of making an uproar is mutually constant-temperature crystal oscillator, and its frequency is less than or equal to 100MHz.
3. a kind of Frequency Synthesizer with Low Phase Noise according to claim 2, is characterized in that: the low oscillator of making an uproar mutually of described high frequency is constant temperature sound table oscillator, and its operating frequency is more than or equal to 1GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201420335988.2U CN203896336U (en) | 2014-06-23 | 2014-06-23 | Low-phase-noise frequency synthesizer |
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| CN201420335988.2U CN203896336U (en) | 2014-06-23 | 2014-06-23 | Low-phase-noise frequency synthesizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106209089A (en) * | 2016-08-02 | 2016-12-07 | 中国电子科技集团公司第三十八研究所 | A kind of single loop frequency division type broadband frequency synthesizer of phase locking |
-
2014
- 2014-06-23 CN CN201420335988.2U patent/CN203896336U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106209089A (en) * | 2016-08-02 | 2016-12-07 | 中国电子科技集团公司第三十八研究所 | A kind of single loop frequency division type broadband frequency synthesizer of phase locking |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 610000, Sichuan, Wuhou District Province, four Xing Road, No. 7, building 2, 166, 1, 4, 5, 2, 3, 4, 5, 6,, 7 Patentee after: Chengdu Shiyuan frequency control technology Limited by Share Ltd Address before: 610000, B, unit 3, 5, 6, 7, No. 166, No. four, Wu Xing Road, 7, Sichuan, Chengdu, Wuhou District, China Patentee before: CHENGDU SHIYUAN FREQUENCY CONTROL TECHNOLOGY CO., LTD. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A kind of Frequency Synthesizer with Low Phase Noise Effective date of registration: 20170527 Granted publication date: 20141022 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: Chengdu Shiyuan frequency control technology Limited by Share Ltd Registration number: 2017510000028 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220209 Granted publication date: 20141022 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: CHENGDU SHIYUAN FREQUENCY CONTROL TECHNOLOGY CO.,LTD. Registration number: 2017510000028 |