CN109104187A - A kind of full-digital broadband frequency synthesizer - Google Patents
A kind of full-digital broadband frequency synthesizer Download PDFInfo
- Publication number
- CN109104187A CN109104187A CN201811075900.7A CN201811075900A CN109104187A CN 109104187 A CN109104187 A CN 109104187A CN 201811075900 A CN201811075900 A CN 201811075900A CN 109104187 A CN109104187 A CN 109104187A
- Authority
- CN
- China
- Prior art keywords
- frequency
- phase
- digital
- loop filter
- frequency synthesizer
- 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.)
- Granted
Links
- 239000013078 crystal Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 230000006978 adaptation Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000003786 synthesis reaction Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- H03L7/1803—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 the counter or frequency divider being connected to a cycle or pulse swallowing circuit
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The present invention is provided with programmable logic controller (PLC) in the circuit of frequency synthesizer, can be according to the real input signal situation of frequency synthesizer come the parameter of adjustment loop filter, and then enriches the function and adaptation range of traditional frequency synthesizer.Secondly, the present invention is also provided with the judgement that phase/frequency decision device to carry out input signal phase and frequency, the complexity and power consumption of circuit can be effectively reduced to avoid arithmetic operator and code conversion.
Description
Technical field
The present invention relates to a kind of frequency synthesizers, more particularly to a kind of digital wideband frequency synthesizer.
Background technique
Bandwidth is the mark that ULTRA-WIDEBAND RADAR is different from Narrow-band Radar, and ULTRA-WIDEBAND RADAR is capable of providing relative to Narrow-band Radar
More target informations also just can be carried out more effective target identification.With the progress of Radar Signal Processing Technology, can handle
The bandwidth of video signal is more and more wider, so that the original working frequency of radar frequency synthesizer and bandwidth are no longer satisfied ultra wide band
The technical requirements of Connectors for Active Phased Array Radar.
Frequency synthesizer is Modern Communication System, radar, the Primary Component in test equipment, it may be possible to provide high-precision, high
The frequency of stability.Since the concept for being put forward for the first time frequency synthesis from the 1930s, 3 kinds of basic frequencies have been formd
Synthetic method: (1) Direct frequency synthesizer；(2) Phase locking frequency synthesis；(3) direct digital synthesis technique (DDS).The frequency of early stage
Synthesizer uses Direct frequency synthesizer mode, their structures are simple, are easily achieved, but volume is big, at high cost.
A kind of frequency synthesizer is proposed in patent document CN201320570307.6.Frequency hopping of the invention is swashed using DDS
The method of PLL is encouraged to realize the scheme of frequency synthesis, Frequency uses the direct producing method of DDS, fully demonstrates software wireless
The flexibility of electricity and portability, frequency synthesizer possesses cracking locking time, and guarantees lesser spuious, accurate frequency
Rate precision, a low noise of making an uproar, the excellent purity of frequency spectrum and wide frequency hopping range, have reached higher technical indicator.However the hair
In bright equipment, circuit structure regular and rigid, flexibility is inadequate, and scalability is inadequate, can not according to different actual needs into
Row adjustment.
Summary of the invention
The purpose of the present invention is overcoming above-mentioned the deficiencies in the prior art, a kind of structure novel is provided, is skillfully constructed frequency
Synthesizer, can be by universal logic module and phase judging module come flexible setting frequency synthesizer as needed
Every attribute, and then the function and adaptation range of traditional frequency synthesizer are enriched, greatly promote the flexibility of frequency synthesizer
And tracking performance.
The present invention is realized by scheme below:
A kind of full-digital broadband frequency synthesizer, specifically includes: digital frequency phase detector, loop filter, number pressure
Control oscillator, digital frequency divider, loop parameter controller, phase/frequency decision device, programmable logic controller (PLC)；Digital frequency discrimination
The output of phase discriminator is connected with phase/frequency decision device, phase/frequency decision device respectively with loop filter and programmable logic
Controller is connected, and loop filter is connected with digital vco, and the output of voltage-controlled vibrator is connected with frequency divider, frequency divider
All the way input signal of the output as digital frequency phase detector；The digital programmable logic controller and loop parameter simultaneously
Controller is connected, and loop parameter controller is connected with loop filter.
Further, the digital frequency phase detector carries out frequency and phase to the output of input reference signal and frequency divider
Compare, then obtains the signal that one represents phase/frequency error and give phase/frequency decision device；Phase/frequency decision device according to
Error signal is adjudicated into property, obtains the court verdict of phase and frequency, and be sent respectively to loop filter and programmable logic
Controller；Programmable logic controller (PLC) carries out the parameter tune of loop filter according to the court verdict of phase/frequency decision device
It is whole, and the result of adjustment is sent to loop parameter controller, loop parameter controller carries out loop filter according to result
Control.
Further, tunable resistance is provided in the loop filter, the loop parameter controller is by adjusting ring
Tunable resistance in path filter adjusts the performance of loop filter.
Further, the digital frequency phase detector includes the pre- frequency division module of clock, multi-bit counter module, multi-bit register
Module, Edge check module, while the pre- frequency division module of clock receives the clock signal of fixed crystal oscillator clock input, then by even
Number, odd number, half-integer cascaded divider export reference clock signal, then export reference clock signal and give Edge check module
With multi-bit counter module, Edge check receives feedback clock signal, then detects reference clock signal and feedback clock signal
Edge, the signal of the phase/frequency error is obtained according to the edge situation of the two.
Further, four nor gates and two D flip-flops are specifically included in the circuit of phase/frequency decision device.
Further, the phase/frequency decision device include two logic circuits, described two logic circuits include two or
Not circuit, wherein nor gate a input terminal receives the positive negative error signal of digital frequency phase detector output, another
Input terminal receives the judgement period that a judgement clock is used to determine phase/frequency judgement；The output end of the logic circuit is made
For the input terminal of D flip-flop, another input terminal connection judgement clock signal of D flip-flop, D flip-flop output height
Low level obtains the signal after tracing compensation.
Further, the programmable logic controller (PLC) can be siemens PLC or mitsubishi FX2N or ABB
AC500。
Further, the frequency synthesizer can be applied to airborne radar, trailer-mounted radar, aircraft radar and satellite radar.
Further, the digital frequency divider can be even number divider, odd divider, decimal frequency divider.
Compared with prior art, the present invention the beneficial effect is that:
Firstly, the present invention is provided with programmable logic controller (PLC) in the circuit of frequency synthesizer, it can be comprehensive according to frequency
The real input signal situation of clutch carrys out the parameter of adjustment loop filter, so enrich traditional frequency synthesizer function and
Adaptation range.
Secondly, the present invention is also provided with the judgement that phase/frequency decision device to carry out input signal phase and frequency, it can
To avoid arithmetic operator and code conversion, the complexity and power consumption of circuit are effectively reduced.
Finally, frequency synthesizer flexible structure provided by the invention, complexity is low, low in energy consumption, full digital processing, has wide
Wealthy application advantage and economic prospect.
Detailed description of the invention
Fig. 1 is the circuit structure diagram of frequency synthesizer of the present invention.
Fig. 2 is the circuit structure diagram of the digital frequency phase detector in frequency synthesizer of the present invention.
Fig. 3 is the circuit structure diagram of the phase/frequency decision device in frequency synthesizer of the present invention.
Specific embodiment
The following further describes the present invention with reference to the drawings.These attached drawings are simplified schematic diagram, only with the side of signal
Formula illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
With the continuous development of communication, DTV, satellite positioning, aerospace and remote control and telemetering technique, to frequency source
Frequency stability, the purity of frequency spectrum, the requirement of frequency range and output frequency number it is higher and higher.In order to improve frequency stabilization
Degree, through solving frequently with the methods of crystal oscillator, but it is not able to satisfy the requirement more than frequency number, therefore, a large amount of at present
Using frequency synthesis technique.It, can be from the mark of a high stability and high accuracy by add to frequency, subtract, multiplication and division operation
Quasi- frequency source generates different frequency largely with same stability and accuracy.Frequency synthesizer is from one or more
The device of multi-frequency is generated in reference frequency.It is the essential Key Circuit of modern communication systems, is widely used in counting
The fields such as word communication, satellite communication, radar, navigation, aerospace, remote-control romote-sensing and high-speed equipment instrument.To communicate as generation
The information industry of watch is the most fast industry of contemporary development, and therefore, frequency synthesizer has also obtained very fast development, is formd perfect
Series of products, the market demand are also especially big.
The technology complexity of frequency synthesizer is very high, have passed through and directly synthesizes analog frequency synthesizer, phase-lock frequency
Three synthesizer, Direct Digital frequency synthesizer developing stage.And wherein phase-lock frequency synthesizer and Direct Digital frequency
Rate synthesizer is paid close attention to by all circles, and is grown rapidly.
The present invention is based on current development trends and technology to need, and proposes the frequency that a kind of structure is simple, feature-rich
Synthesizer.Below with reference to specific embodiment, the present invention will be described.
Embodiment one:
The circuit structure diagram of frequency synthesizer of the invention as shown in figure 1, specifically: digital frequency phase detector, loop
Filter, digital vco, digital frequency divider, loop parameter controller, phase/frequency decision device, programmable logic control
Device processed；The output of digital frequency phase detector is connected with phase/frequency decision device, phase/frequency decision device respectively with loop filtering
Device is connected with programmable logic controller (PLC), and loop filter is connected with digital vco, the output of voltage-controlled vibrator with point
Frequency device is connected, all the way input signal of the output of frequency divider as digital frequency phase detector；Digital programmable logic control simultaneously
Device is connected with loop parameter controller, and loop parameter controller is connected with loop filter.
In the present invention, relevant digital frequency phase detector, digital vco, digital frequency divider all have high-resolution
The characteristics of rate, High Linear, high complexity, with the process performance and precision of promotion signal, and increasing phase/frequency decision device can be with
Arithmetic operator and code conversion are avoided, the complexity and power consumption of circuit structure are significantly reduced.
Further, digital frequency phase detector carries out the ratio of frequency and phase to the output of input reference signal and frequency divider
Compared with then obtaining the signal that one represents phase/frequency error and give phase/frequency decision device；Phase/frequency decision device is according to accidentally
Difference signal is adjudicated into property, obtains the court verdict of phase and frequency, and be sent respectively to loop filter and programmable logic control
Device processed；Programmable logic controller (PLC) carries out the parameter adjustment of loop filter according to the court verdict of phase/frequency decision device,
And the result of adjustment is sent to loop parameter controller, loop parameter controller controls loop filter according to result
System.
Further, tunable resistance is provided in loop filter, loop parameter controller is by adjusting loop filter
In tunable resistance adjust the performance of loop filter.
For different signals to be processed, the coverage area of bandwidth may be very big, comprehensive for traditional frequency
For clutch, manageable bandwidth range suffers from the performance limitation of annular filter, and simple expansion ring-type is filtered
On the one hand the process range of wave device will increase the cost of annular filter, can also reduce the processing accuracy of annular filter, and originally
By increasing programmable logic controller in circuit in invention, programmable logic controller (PLC) is by receiving loop filter
Input signal is in real time adjusted annular filter according to signal to be processed, can expand the place of annular filter in this way
Bandwidth range is managed, the flexibility of synthesis filter is improved.
Fig. 2 shows the circuit structures of digital frequency phase detector used in the present invention, specifically include clock and divide in advance
Module, multi-bit counter module, multi-bit register module, Edge check module, while the pre- frequency division module of clock receives fixed crystalline substance
The clock signal that the clock that shakes inputs, then exports reference clock signal by even number, odd number, half-integer cascaded divider, then
Reference clock signal is exported to Edge check module and multi-bit counter module, Edge check receives feedback clock signal, so
The edge for detecting reference clock signal and feedback clock signal afterwards, obtains phase/frequency error according to the edge situation of the two
Signal.
For digital frequency phase detector, the selection of the clock signal of reference is particularly significant, in number mirror of the invention
In frequency phase discriminator, using even frequency division, the cascade of equal duty ratio frequency division by odd integers and half integer frequency divider is realized to fixed clock
Frequency dividing obtain fixed duty cycle multidigit counting clock input.Control precision is improved in this way, while reducing realization difficulty.
In digital frequency phase detector of the invention simultaneously, Edge check module is also provided with to detect reference clock and feedback
The edge of clock counts frequency difference when frequency is unlocked, exports frequency difference digital quantity；When Frequency Locking, to differ into
Row counts, and completes the update to linear difference digital quantity in the rising edge of each reference clock.
Fig. 3 shows the circuit structure of phase/frequency decision device used in the present invention, and four are specifically included in circuit
Nor gate and two D flip-flops.
Further, phase/frequency decision device includes two logic circuits 1 and logic circuit 2, and two logic circuits include two
A OR-NOT circuit, wherein nor gate a input terminal receives the positive negative error signal of digital frequency phase detector output, in addition
One input terminal receives the judgement period that a judgement clock is used to determine phase/frequency judgement；The output end of logic circuit is made
For the input terminal of D flip-flop, another input terminal connection judgement clock signal of D flip-flop, D flip-flop output height
Low level obtains the signal after tracing compensation.
Specifically, two logic circuits can all be resetted after each judgement by judgement clock signal to guarantee each
Stable output is carried out when clock cycle starts, does not have dropping signal when next time update cycle, then logic circuit 1 is kept
High level, and when adjudicating clock signal arrival rising edge, the decision circuit high level that then output frequency/phase rises；And such as
Fruit only has dropping signal within time update cycle, then the high level of decision circuit final output frequency/phase decline.
If necessary to change the update cycle of decision circuit, then the frequency dividing ratio for only needing to change circuit can modify update
Period.This design can effectively reduce the complexity of circuit and can work within any update cycle, convenient, spirit
It is living, accurate, efficient.
Meanwhile specifically, the considerations of overall cost, quality, three aspect of performance, programmable logic controller (PLC) can be from west gate
It is chosen in tri- models of AC500 of sub- S7-200 or mitsubishi FX2N or ABB.
Further, frequency synthesizer can be applied to airborne radar, trailer-mounted radar, aircraft radar and satellite radar.
Further, digital frequency divider can be even number divider, odd divider, decimal frequency divider.
The above describes the embodiments of the present invention, it should be appreciated to those skilled in the art that this is merely illustrative of,
Those skilled in the art without departing from the principle and essence of the present invention, can make numerous variations to embodiment
Or modification, but these change and modification each fall within protection scope of the present invention.
Claims (9)
1. a kind of full-digital broadband frequency synthesizer, characterized by comprising: digital frequency phase detector, loop filter, number
Voltage controlled oscillator, digital frequency divider, loop parameter controller, phase/frequency decision device, programmable logic controller (PLC)；Number mirror
The output of frequency phase discriminator is connected with phase/frequency decision device, phase/frequency decision device respectively with loop filter and programmable patrol
It collects controller to be connected, loop filter is connected with digital vco, and the output of voltage-controlled vibrator is connected with frequency divider, frequency dividing
All the way input signal of the output of device as digital frequency phase detector；The digital programmable logic controller and loop are joined simultaneously
Number controller is connected, and loop parameter controller is connected with loop filter.
2. frequency synthesizer according to claim 1, it is characterised in that: the digital frequency phase detector is to input with reference to letter
Number and frequency divider output carry out frequency and phase comparison, then obtain one and represent the signal of phase/frequency error to phase
Position/frequency decision device；Phase/frequency decision device is adjudicated according to error signal into property, and the court verdict of phase and frequency is obtained, and
It is sent respectively to loop filter and programmable logic controller (PLC)；Programmable logic controller (PLC) is according to phase/frequency decision device
Court verdict, carries out the parameter adjustment of loop filter, and the result of adjustment is sent to loop parameter controller, loop parameter
Controller controls loop filter according to result.
3. frequency synthesizer according to claim 2, it is characterised in that: be provided with tunable electricity in the loop filter
Resistance, the loop parameter controller adjust the performance of loop filter by adjusting the tunable resistance in loop filter.
4. frequency synthesizer according to claim 1, it is characterised in that: the digital frequency phase detector includes that clock divides in advance
Frequency module, multi-bit counter module, multi-bit register module, Edge check module, while the pre- frequency division module of clock is received and is fixed
The clock signal of crystal oscillator clock input, then exports reference clock signal by even number, odd number, half-integer cascaded divider, so
Reference clock signal is exported to Edge check module and multi-bit counter module afterwards, Edge check receives feedback clock signal,
Then the edge for detecting reference clock signal and feedback clock signal, obtains the phase/frequency according to the edge situation of the two
The signal of error.
5. frequency synthesizer according to claim 1, it is characterised in that: have in the circuit of the phase/frequency decision device
Body includes four nor gates and two D flip-flops.
6. frequency synthesizer according to claim 5, it is characterised in that: the phase/frequency decision device includes two and patrols
Circuit is collected, described two logic circuits include two OR-NOT circuits, and wherein nor gate a input terminal receives digital frequency discrimination
The positive negative error signal of phase discriminator output, another input terminal receive a judgement clock and are used to determine that phase/frequency is adjudicated
The judgement period；Input terminal of the output end of the logic circuit as D flip-flop, another input of D flip-flop
End connection judgement clock signal, D flip-flop export low and high level to obtain the signal after tracing compensation.
7. frequency synthesizer according to claim 1, it is characterised in that: the programmable logic controller (PLC) can be west gate
The AC500 of sub- S7-200 or mitsubishi FX2N or ABB.
8. frequency synthesizer according to claim 1, it is characterised in that: the frequency synthesizer can be applied to airborne thunder
It reaches, trailer-mounted radar, aircraft radar and satellite radar.
9. frequency synthesizer according to claim 1, it is characterised in that: the digital frequency divider can be even frequency division
Device, odd divider, decimal frequency divider.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811075900.7A CN109104187B (en) | 2018-09-14 | 2018-09-14 | Full-digital broadband frequency synthesizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811075900.7A CN109104187B (en) | 2018-09-14 | 2018-09-14 | Full-digital broadband frequency synthesizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109104187A true CN109104187A (en) | 2018-12-28 |
| CN109104187B CN109104187B (en) | 2022-09-06 |
Family
ID=64866474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811075900.7A Active CN109104187B (en) | 2018-09-14 | 2018-09-14 | Full-digital broadband frequency synthesizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109104187B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380725A (en) * | 2019-05-30 | 2019-10-25 | 芯创智（北京）微电子有限公司 | A kind of gain control system and method for frequency and phase discrimination module |
| CN111208727A (en) * | 2020-01-17 | 2020-05-29 | 深圳市风云实业有限公司 | High-precision satellite pulse-per-second synchronous time keeping device and method |
| CN111642140A (en) * | 2019-01-02 | 2020-09-08 | 京东方科技集团股份有限公司 | Measuring device and measuring method |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6353647B1 (en) * | 1995-10-20 | 2002-03-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Phase locked loop |
| US6650187B1 (en) * | 2002-08-29 | 2003-11-18 | Qualcomm, Incorporated | Decision directed suppressed carrier symbol-rate PLL with programmable phase discriminator and chip-rate phase extrapolation |
| US20040087293A1 (en) * | 2002-11-04 | 2004-05-06 | Rolf Jaehne | Automatic center frequency tuning of a voltage controlled oscillator |
| CN1770633A (en) * | 2004-10-26 | 2006-05-10 | 大唐移动通信设备有限公司 | Clock phase-locked loop and clock phase-locking control method |
| CN101257304A (en) * | 2008-04-03 | 2008-09-03 | 北京大学 | Double-loop circuit frequency synthesizer and method for tuning gross adjustment loop circuit |
| EP2161590A1 (en) * | 2008-09-05 | 2010-03-10 | Thales | Synthetizer for radar transmitter/receiver |
| CN102073032A (en) * | 2010-11-02 | 2011-05-25 | 中国兵器工业第二○六研究所 | Modular generation method for multi-waveform radar signal |
| CN103439690A (en) * | 2013-08-28 | 2013-12-11 | 上海航天测控通信研究所 | Ultra wide band radar frequency synthesizer device |
| CN203457138U (en) * | 2013-09-13 | 2014-02-26 | 贵州航天天马机电科技有限公司 | Frequency synthesizer |
| CN103986464A (en) * | 2014-05-22 | 2014-08-13 | 无锡中科微电子工业技术研究院有限责任公司 | Self-calibration device and method for loop parameters of phase-locked loop |
| CN104333377A (en) * | 2013-07-08 | 2015-02-04 | 美国亚德诺半导体公司 | Digital phase detector |
-
2018
- 2018-09-14 CN CN201811075900.7A patent/CN109104187B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6353647B1 (en) * | 1995-10-20 | 2002-03-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Phase locked loop |
| US6650187B1 (en) * | 2002-08-29 | 2003-11-18 | Qualcomm, Incorporated | Decision directed suppressed carrier symbol-rate PLL with programmable phase discriminator and chip-rate phase extrapolation |
| US20040087293A1 (en) * | 2002-11-04 | 2004-05-06 | Rolf Jaehne | Automatic center frequency tuning of a voltage controlled oscillator |
| CN1770633A (en) * | 2004-10-26 | 2006-05-10 | 大唐移动通信设备有限公司 | Clock phase-locked loop and clock phase-locking control method |
| CN101257304A (en) * | 2008-04-03 | 2008-09-03 | 北京大学 | Double-loop circuit frequency synthesizer and method for tuning gross adjustment loop circuit |
| EP2161590A1 (en) * | 2008-09-05 | 2010-03-10 | Thales | Synthetizer for radar transmitter/receiver |
| CN102073032A (en) * | 2010-11-02 | 2011-05-25 | 中国兵器工业第二○六研究所 | Modular generation method for multi-waveform radar signal |
| CN104333377A (en) * | 2013-07-08 | 2015-02-04 | 美国亚德诺半导体公司 | Digital phase detector |
| CN103439690A (en) * | 2013-08-28 | 2013-12-11 | 上海航天测控通信研究所 | Ultra wide band radar frequency synthesizer device |
| CN203457138U (en) * | 2013-09-13 | 2014-02-26 | 贵州航天天马机电科技有限公司 | Frequency synthesizer |
| CN103986464A (en) * | 2014-05-22 | 2014-08-13 | 无锡中科微电子工业技术研究院有限责任公司 | Self-calibration device and method for loop parameters of phase-locked loop |
Non-Patent Citations (1)
| Title |
|---|
| 唐茜: "DVI接收端模拟部分电路研究与实现", 《中国硕士学位论文全文数据库信息科技辑》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111642140A (en) * | 2019-01-02 | 2020-09-08 | 京东方科技集团股份有限公司 | Measuring device and measuring method |
| CN111642140B (en) * | 2019-01-02 | 2023-12-01 | 京东方科技集团股份有限公司 | Measuring device and measuring method |
| CN110380725A (en) * | 2019-05-30 | 2019-10-25 | 芯创智（北京）微电子有限公司 | A kind of gain control system and method for frequency and phase discrimination module |
| CN110380725B (en) * | 2019-05-30 | 2023-06-20 | 芯创智创新设计服务中心(宁波)有限公司 | Gain control system and method of frequency and phase discrimination module |
| CN111208727A (en) * | 2020-01-17 | 2020-05-29 | 深圳市风云实业有限公司 | High-precision satellite pulse-per-second synchronous time keeping device and method |
| CN111208727B (en) * | 2020-01-17 | 2021-03-30 | 深圳市风云实业有限公司 | High-precision satellite pulse-per-second synchronous time keeping device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109104187B (en) | 2022-09-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109104187A (en) | A kind of full-digital broadband frequency synthesizer | |
| CN107634761B (en) | Digital phase-locked loop frequency synthesis device | |
| CN102045062B (en) | Digital phase-locked loop based on Cordic algorithm | |
| CN106341122A (en) | Phase-locked loop having a multi-band oscillator and method for calibrating same | |
| CN104320137B (en) | A kind of phase-locked loop frequency synthesizer | |
| CN102723931B (en) | The pulse wave generation method that a kind of wide dynamic high precision edge time is adjustable | |
| CN204131498U (en) | A kind of phase-locked loop frequency synthesizer | |
| CN106067815B (en) | Frequency synthesizer based on DDS and fractional frequency division phase-locked loop | |
| CN110535465B (en) | Reference oscillator with variable duty cycle, frequency synthesizer and receiver therefor | |
| CN103178838A (en) | Device and method for frequency synthesis of phase-locked loop or phase-locked ring | |
| US20120268215A1 (en) | Circuit arrangement for generation of radio frequency output signals which form a broadband frequency ramp | |
| CN101714875B (en) | Phase-locked loop circuit | |
| CN103647553A (en) | Direct current frequency modulation reference source circuit of broadband ultra low phase noise | |
| CN105223555A (en) | A kind of wideband low noise frequency modulation signal source | |
| CN203708219U (en) | 3.4G digital phase-locking frequency multiplier for CPT clock | |
| CN107565956B (en) | VCO (voltage controlled oscillator) frequency band switching circuit applied to double-loop clock data recovery circuit and loop switching method thereof | |
| CN211830747U (en) | Link structure of ultralow phase noise and low stray stepping frequency source | |
| CN110289858B (en) | Broadband fine stepping agile frequency conversion combination system | |
| CN113726334B (en) | S-band low-phase-noise low-stray fine stepping frequency source assembly and use method | |
| CN103326718B (en) | A kind of rf chain of rubidium frequency standard | |
| CN204836137U (en) | Frequency synthesizer | |
| CN104467817B (en) | One kind finely tuning algorithm applied to the loop of automatic frequency control system (AFC) | |
| CN208226994U (en) | A kind of thin stepping low noise frequency source in broadband | |
| CN202026299U (en) | Frequency synthesizing device | |
| CN104702279A (en) | Frequency synthesizer of phase-locked loop |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |