CN202978894U - Multi-radio frequency feedback channel frequency synthesizer - Google Patents
Multi-radio frequency feedback channel frequency synthesizer Download PDFInfo
- Publication number
- CN202978894U CN202978894U CN 201220737497 CN201220737497U CN202978894U CN 202978894 U CN202978894 U CN 202978894U CN 201220737497 CN201220737497 CN 201220737497 CN 201220737497 U CN201220737497 U CN 201220737497U CN 202978894 U CN202978894 U CN 202978894U
- Authority
- CN
- China
- Prior art keywords
- frequency
- frequency divider
- input
- output
- controlled oscillator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
The utility model discloses a multi-radio frequency feedback channel frequency synthesizer. The multi-radio frequency feedback channel frequency synthesizer includes a sideband mixer, a phase discriminator, a loop filter, bandpass filters, a voltage-controlled oscillator and frequency dividers; an input end of the phase discriminator is connected with a reference signal source, and an output end of the phase discriminator is connected with an input end of a loop filter; an output end of the loop filter is connected with an input end of the voltage-controlled oscillator; the frequency dividers comprise a main frequency divider and an auxiliary frequency divider; an input end of the main frequency divider is connected with an output end of the voltage-controlled oscillator, and an output end of the main frequency divider is connected with an input end of the sideband mixer through one bandpass filter; an input end of the auxiliary frequency divider is connected with an output end of the voltage-controlled oscillator, and an output end of the auxiliary frequency divider is connected with an input end of the sideband mixer through one bandpass filter; and an output end of the sideband mixer is connected with an input end of the phase discriminator. The multi-radio frequency feedback channel frequency synthesizer of the utility model has the following advantages that: small frequency stepping and low phase noise can be realized at the same time; the complexity in the implementation of the frequency synthesizer can be reduced; and the requirements of a high-performance frequency synthesizer can be satisfied.
Description
Technical field
The utility model relates to the technical field that realizes of frequency synthesizer, is applicable to little stepping, the low frequency synthesizer realization of making an uproar mutually, is widely used in the fields such as radar, communication, electronic countermeasures.
Background technology
In modern microwave equipment, frequency synthesizer as the microwave equipment by signal source, is " heart " of microwave equipment, and its performance has determined the performance of microwave equipment.
Existing frequency synthesizer generally adopts phase-locked loop manner to realize, common phase-locked loop theory diagram as shown in Figure 1, wherein frequency divider has multiple implementation, and pluses and minuses are respectively arranged.The first frequency divider is integral frequency divisioil, and its advantage is that the divider noise background is low, can realize the Low Phase Noise Signal source; Its shortcoming is that output frequency is the integral multiple of reference frequency, has the contradiction of low phase noise and small frequency stepping.The second frequency divider is decimal frequency divider, its advantage is for realizing the small frequency stepping when adopting high reference signal to realize low phase noise, its shortcoming is that the decimal frequency divider output signal exists phase jitter, cause clutter generation in some frequency has larger band, affect the application of frequency source.The third frequency divider is for adopting the DDS device to realize decimal frequency divider, and its advantage is identical with the second frequency divider; Its shortcoming is that the phase of output signal Noise Background is high than other frequency dividers, and can there be larger noise signal in DDS when the output high-frequency signal, causes some frequency that clutter generation in larger band is arranged, and affects the application of frequency source.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of implementation complexity that can reduce frequency synthesizer, satisfies many radio-frequency (RF) FEEDBACK channel frequence synthesizer that the high performance frequency synthesizer requires.
For solving the problems of the technologies described above, technical solution adopted in the utility model is: a kind of many radio-frequency (RF) FEEDBACK channel frequence synthesizer comprises sideband frequency mixer, phase discriminator, loop filter, band pass filter, voltage controlled oscillator and frequency divider; The input of described phase discriminator is connected with derived reference signal, and its output is connected with the input of loop filter; The output of described loop filter is connected with the input of voltage controlled oscillator; The output of described voltage controlled oscillator is connected with the input of frequency divider; Described frequency divider comprises main frequency divider and auxiliary frequency divider; The input of described main frequency divider is connected with the output of voltage controlled oscillator, and its output is connected by the input of band pass filter with the sideband frequency mixer; The input of described auxiliary frequency divider is connected with the output of voltage controlled oscillator, and its output is connected by the input of band pass filter with the sideband frequency mixer; The output of described sideband frequency mixer is connected with the input of phase discriminator.
Described main frequency divider is integer frequency divider, and described auxiliary frequency divider is integer frequency divider or DDS class decimal frequency divider.
Described sideband frequency mixer can adopt quadrature modulator to realize.Described sideband frequency mixer can also adopt frequency mixer to add sideband filter and realize.Described sideband frequency mixer can also adopt the combination of above-mentioned dual mode to realize.
Feedback path of the present utility model adopts two frequency dividers, be respectively main frequency divider and auxiliary frequency divider, the output signal of every road frequency divider enters the sideband frequency mixer after the processing of band pass filter, the upper sideband of sideband frequency mixer output or lower sideband signal enters phase discriminator and reference signal is carried out phase demodulation realizes that phase-locked loop locks.
Adopt the beneficial effect that technique scheme produces to be: by voltage controlled oscillator mixing after the feedback path employing multi-channel frequency division of phase discriminator is realized feedback signal, realize low phase noise when realizing the small frequency stepping, reduce the implementation complexity of frequency synthesizer, satisfy the requirement of high performance frequency synthesizer.
Description of drawings
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the theory diagram of prior art medium frequency synthesizer;
Fig. 2 is the theory diagram of many radio-frequency (RF) FEEDBACK channel frequence synthesizer described in the utility model.
Embodiment
Embodiment as shown in Figure 2 as can be known, many radio-frequency (RF) FEEDBACK channel frequence synthesizer described in the utility model comprises sideband frequency mixer, phase discriminator, loop filter, band pass filter, voltage controlled oscillator and frequency divider; The input of described phase discriminator is connected with derived reference signal, and its output is connected with the input of loop filter; The output of described loop filter is connected with the input of voltage controlled oscillator; The output of described voltage controlled oscillator is connected with the input of frequency divider; Described frequency divider comprises main frequency divider and auxiliary frequency divider; The input of described main frequency divider is connected with the output of voltage controlled oscillator, and its output is connected by the input of band pass filter with the sideband frequency mixer; The input of described auxiliary frequency divider is connected with the output of voltage controlled oscillator, and its output is connected by the input of band pass filter with the sideband frequency mixer; The output of described sideband frequency mixer is connected with the input of phase discriminator.
Above-mentioned main frequency divider is integer frequency divider, and described auxiliary frequency divider is integer frequency divider or DDS class decimal frequency divider.Main frequency divider is realized large step frequency control, and auxiliary frequency divider is realized small frequency stepping control; For guaranteeing the phase of output signal noise, main frequency divider adopts integer frequency divider, and selects the main frequency divider divider ratio much smaller than auxiliary frequency divider divider ratio.When auxiliary frequency divider was selected to adopt integer frequency divider, the locking output signal frequency was discontinuity point; When auxiliary frequency divider selected to adopt DDS class decimal frequency divider, the stepping of locking output signal frequency was little, realizes that substantially signal frequency is continuous.
Above-mentioned sideband mixer output signal both can select upper sideband also can select lower sideband, selected according to signal characteristic.
Claims (2)
1. the synthesizer of radio-frequency (RF) FEEDBACK channel frequence more than a kind, is characterized in that, comprises sideband frequency mixer, phase discriminator, loop filter, band pass filter, voltage controlled oscillator and frequency divider; The input of described phase discriminator is connected with derived reference signal, and its output is connected with the input of loop filter; The output of described loop filter is connected with the input of voltage controlled oscillator; The output of described voltage controlled oscillator is connected with the input of frequency divider; Described frequency divider comprises main frequency divider and auxiliary frequency divider; The input of described main frequency divider is connected with the output of voltage controlled oscillator, and its output is connected by the input of band pass filter with the sideband frequency mixer; The input of described auxiliary frequency divider is connected with the output of voltage controlled oscillator, and its output is connected by the input of band pass filter with the sideband frequency mixer; The output of described sideband frequency mixer is connected with the input of phase discriminator.
2. many radio-frequency (RF) FEEDBACK channel frequence synthesizer according to claim 1 is characterized in that described main frequency divider is integer frequency divider, and described auxiliary frequency divider is integer frequency divider or DDS class decimal frequency divider.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220737497 CN202978894U (en) | 2012-12-28 | 2012-12-28 | Multi-radio frequency feedback channel frequency synthesizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220737497 CN202978894U (en) | 2012-12-28 | 2012-12-28 | Multi-radio frequency feedback channel frequency synthesizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202978894U true CN202978894U (en) | 2013-06-05 |
Family
ID=48519911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220737497 Expired - Lifetime CN202978894U (en) | 2012-12-28 | 2012-12-28 | Multi-radio frequency feedback channel frequency synthesizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202978894U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106899293A (en) * | 2017-03-13 | 2017-06-27 | 广州海格通信集团股份有限公司 | Frequency synthesizer |
| CN109245831A (en) * | 2018-08-29 | 2019-01-18 | 成都天大仪器股份有限公司 | low frequency-radio frequency network analyzer |
-
2012
- 2012-12-28 CN CN 201220737497 patent/CN202978894U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106899293A (en) * | 2017-03-13 | 2017-06-27 | 广州海格通信集团股份有限公司 | Frequency synthesizer |
| CN109245831A (en) * | 2018-08-29 | 2019-01-18 | 成都天大仪器股份有限公司 | low frequency-radio frequency network analyzer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI528725B (en) | Wideband frequency synthesizer and frequency synthesizing method thereof | |
| CN205584178U (en) | Realize frequency agility's broadband microwave frequency synthesizer | |
| CN204180052U (en) | The phase-locked frequency hopping synthesizer of a kind of X-band shift frequency | |
| CN105187060A (en) | Phase-locked loop circuit with low-phase noise and implementation method thereof | |
| CN202949409U (en) | Dual VCO-based ultra-wide band frequency synthesizer | |
| TWI501559B (en) | Frequency synthesizer and frequency synthesizing method thereof | |
| CN108988857A (en) | A kind of broadband low phase noise frequency synthesizer and method based on optical-electronic oscillator | |
| CN108055035A (en) | A kind of wideband frequency expanding unit of optical-electronic oscillator | |
| CN105375922A (en) | Microwave signal source used for miniature atomic clock | |
| CN103684445A (en) | Multiphase high-resolution phase locked loop | |
| CN104836581A (en) | High-performance broadband frequency source generation circuit employing multi-harmonic reference, and generation method | |
| CN202978894U (en) | Multi-radio frequency feedback channel frequency synthesizer | |
| CN205320060U (en) | High -speed frequency hopping frequency synthesizer in broadband | |
| CN104300977A (en) | Low-phase-noise high-speed frequency synthesizing system | |
| CN202978895U (en) | Low phase noise frequency synthesizer | |
| CN201571017U (en) | Dislocation locking prevention mixing circuit of mixing phase-locked loop | |
| CN202978899U (en) | Variable reference frequency synthesizer | |
| CN201479116U (en) | Combined frequency hopping synthesizer | |
| CN117081583A (en) | Frequency source for improving phase noise | |
| CN105553475A (en) | High frequency point frequency source synthetic circuit based on digital frequency division and harmonic frequency mixing | |
| CN208445546U (en) | A kind of broadband low phase noise frequency synthesizer based on optical-electronic oscillator | |
| CN204103898U (en) | A kind of frequency synthesizer | |
| CN205647494U (en) | Ultra wide band low phase noise hangs down stray frequency synthesizer | |
| CN101834620A (en) | Broadband receiver with phase-locked loop local oscillation circuit | |
| CN204180050U (en) | A kind of X-band low noise benchmark local frequency source of secondary |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130605 |