CN110138383A - Frequency generating circuit - Google Patents
Frequency generating circuit Download PDFInfo
- Publication number
- CN110138383A CN110138383A CN201810139065.2A CN201810139065A CN110138383A CN 110138383 A CN110138383 A CN 110138383A CN 201810139065 A CN201810139065 A CN 201810139065A CN 110138383 A CN110138383 A CN 110138383A
- Authority
- CN
- China
- Prior art keywords
- circuit
- gating
- gating circuit
- voltage
- 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.)
- Granted
Links
- 230000008878 coupling Effects 0.000 claims description 27
- 238000010168 coupling process Methods 0.000 claims description 27
- 238000005859 coupling reaction Methods 0.000 claims description 27
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 10
- 230000006641 stabilisation Effects 0.000 claims description 8
- 238000011105 stabilization Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000010365 information processing Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003786 synthesis reaction 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
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
- H03L7/113—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using frequency discriminator
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a kind of frequency generating circuit, which includes: phase discriminator, the first gating circuit, the second gating circuit, the first resonance circuit, amplifier, voltage controlled oscillator and feed circuit；First gating circuit and the second gating circuit are used for when second source exports the first level, and the second input terminal for controlling the first gating circuit and the second gating circuit respectively is connected to fixing end, with the voltage of preset voltage controlled oscillator；First gating circuit and the second gating circuit are used to control the first gating circuit respectively when second source exports second electrical level and the second gating circuit first input end is connected to fixing end, to adjust the frequency of voltage controlled oscillator output.The frequency generating circuit shortens the time of Frequency Locking, realizes the function of quick lock in and output frequency.
Description
Technical field
The present invention relates to fields of communication technology, more particularly to a kind of frequency generating circuit.
Background technique
Frequency generating units are particularly significant in Modern Communication System and information processing system.It is as communication system transmitting
When the clock source of the local oscillations source of receiver and digital information processing system, the performance of the direct decision systems of its performance indicator
Index.
Currently, the locking time of frequency generating units increasingly becomes the pass of design with the raising of data transmission bauds
One of key index.Locking time is shorter, and the speed of frequency conversion is faster, then the speed of data transmission is also faster.It obtains high-precision
The frequency of degree, low phase noise, the method for generalling use Phase locking frequency synthesis, but required locking time is longer.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of frequency generating circuit, which shortens frequency
The time of rate locking, realize the function of quick lock in and output frequency.
In order to solve the above technical problems, first technical solution that the present invention uses is: a kind of frequency generating circuit is provided,
The frequency generating circuit includes: phase discriminator, the first gating circuit, the second gating circuit, the first resonance circuit, amplifier, pressure
Control oscillator and feed circuit；The signal input part and signal source of the phase discriminator couple, the signal output of the phase discriminator
End and the first input end of first gating circuit couple, the second input terminal of first gating circuit and the first power supply coupling
It connects, the control terminal of first gating circuit couples external second source, the fixing end of first gating circuit and described the
The first input end of two gating circuits couples, the fixing end of second gating circuit and the input terminal coupling of the voltage controlled oscillator
It connects；The external second source of the control terminal of second gating circuit；The output end coupling of the voltage controlled oscillator is described anti-
The input terminal of current feed circuit；The output end of the feed circuit couples the signal input part of the phase discriminator；The letter of the phase discriminator
Number output end is also coupled with the cathode of one end of first resonance circuit and the amplifier, first resonance circuit
The output end of the fixing end and the amplifier of the other end and first gating circuit couples, the positive coupling of the amplifier
Third power supply is connect, the output end of the amplifier couples the second input terminal of second gating circuit；The first gating electricity
Road and second gating circuit are used to control first gating circuit respectively when the second source exports the first level
It is connected to the second input terminal of second gating circuit with fixing end, with the voltage of the preset voltage controlled oscillator；Described
One gating circuit and second gating circuit are used to control described first respectively when the second source exports second electrical level
Gating circuit and the second gating circuit first input end are connected to fixing end, according to the preset electricity of the voltage controlled oscillator
The feedback frequency of pressure and the voltage controlled oscillator adjusts the voltage of the voltage controlled oscillator, when the voltage of the voltage controlled oscillator
After stabilization, the voltage controlled oscillator exports frequency corresponding with the voltage.
The beneficial effects of the present invention are: frequency generating circuit of the invention passes through control using closed-loop adaptation control mode
The conducting for making the corresponding channel of the first gating circuit and the second gating circuit, according to the voltage of the preset each node of locking frequency, then
The latch voltage of each node is accurately adjusted according to locking frequency, so that voltage controlled oscillator exports accurate frequency according to its latch voltage
Rate shortens the time of Frequency Locking, realizes the function of quick lock in and output frequency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of frequency generating circuit of the present invention；
Fig. 2 is the structural schematic diagram of another embodiment of frequency generating circuit of the present invention.
Specific embodiment
The present invention provides a kind of frequency generating circuit, to keep the purpose of the present invention, technical solution and technical effect brighter
Really, clear, the present invention is described in more detail below, it should be understood that specific implementation regulations described herein are only used for explaining
The present invention is not intended to limit the present invention.
The frequency generating circuit of present embodiment includes: phase discriminator, the first gating circuit, the second gating circuit, first humorous
Shake circuit, amplifier, voltage controlled oscillator and feed circuit.
Wherein, the signal input part of phase discriminator and signal source couple, the signal output end of phase discriminator and the first gating circuit
First input end coupling, the second input terminal and the first supply coupling of the first gating circuit, the control terminal of the first gating circuit
Couple external second source, the first input end coupling of the fixing end of the first gating circuit and the second gating circuit, the second gating
The fixing end of circuit and the input terminal of voltage controlled oscillator couple；The external second source of the control terminal of second gating circuit；Voltage-controlled vibration
Swing the input terminal of the output end coupling feed circuit of device；The signal input part of the output end coupling phase discriminator of feed circuit.
The signal output end of phase discriminator is also coupled with the cathode of one end of the first resonance circuit and amplifier, the first resonance
The output end of the fixing end and amplifier of the other end of circuit and the first gating circuit couples, the anode coupling third of amplifier
Power supply, the output end of amplifier couple the second input terminal of the second gating circuit.
First gating circuit and the second gating circuit are used to control the first choosing respectively when second source exports the first level
Second input terminal of circuit passband and the second gating circuit is connected to fixing end, with the voltage of preset voltage controlled oscillator；First gating
Circuit and the second gating circuit are used to control the first gating circuit and the second gating respectively when second source exports second electrical level
The first input end of circuit is connected to fixing end, according to the feedback of the preset voltage of voltage controlled oscillator and voltage controlled oscillator frequency
Rate adjusts the voltage of voltage controlled oscillator, after the voltage stabilization of voltage controlled oscillator, voltage controlled oscillator output and the voltage after stabilization
Corresponding frequency.
In order to clearly illustrate the frequency generating circuit of above embodiment, specifically refering to fig. 1, Fig. 1 is frequency of the invention
The structural schematic diagram of one embodiment of rate generation circuit.
The frequency generating circuit 10 of present embodiment includes signal source 101, phase discriminator 102, the first gating circuit 103, the
One resonance circuit 104, amplifier 105, feed circuit 106, the second gating circuit 107 and voltage controlled oscillator 108.
Wherein, the signal input part of phase discriminator 102 and signal source 101 couple, the signal output end of phase discriminator 102 and first
The first input end of gating circuit 103 couples, and the second input terminal of the first gating circuit 103 and the first power supply V1 are coupled, and first
The control terminal of gating circuit 103 couples external second source V2, the fixing end and the second gating circuit of the first gating circuit 103
107 first input end coupling, the fixing end of the second gating circuit 107 and the input terminal of voltage controlled oscillator 108 couple；Second choosing
The external second source V2 of the control terminal of circuit passband 107；The input terminal of the output end coupling feed circuit 106 of voltage controlled oscillator 108；
The signal input part of the output end coupling phase discriminator 102 of feed circuit 106.
Cathode coupling of the signal output end of phase discriminator 102 also with one end of the first resonance circuit 104 and amplifier 105
It connects, the output end coupling of the fixing end and amplifier 105 of the other end of the first resonance circuit 104 and the first gating circuit 103,
The anode coupling third power supply V3 of amplifier 105, the output end of amplifier 105 couple the second input of the second gating circuit 107
End.
First gating circuit 103 and the second gating circuit 107 are used to control respectively when second source V2 exports the first level
The second input terminal for making the first gating circuit 103 and the second gating circuit 107 is connected to fixing end, with preset voltage controlled oscillator
108 voltage；First gating circuit 103 and the second gating circuit 107 are used for when second source V2 exports second electrical level, respectively
The first input end for controlling the first gating circuit 103 and the second gating circuit 107 is connected to fixing end, according to voltage controlled oscillator
108 preset voltage and the feedback frequency of voltage controlled oscillator 108 adjust the voltage of voltage controlled oscillator 108, work as voltage controlled oscillator
After 108 voltage stabilization, the output of voltage controlled oscillator 108 frequency corresponding with the voltage after stabilization.
In another embodiment, frequency generating circuit 10 further includes the second resonance circuit, and the one of the second resonance circuit
End is coupled with the fixing end of the first gating circuit 103, and the first of the other end of the second resonance circuit and the second gating circuit 107 is defeated
Enter end coupling.In the present embodiment, in order to inhibit the far-end noise of resonance circuit pole, frequency generating circuit 10 is also wrapped
Filter circuit is included, one end of one end of the filter circuit and the second resonance circuit couples, the other end of the filter circuit and second
The first input end of gating circuit 107 couples.
In order to clearly illustrate any of the above-described embodiment frequency generating circuit circuit layout and working principle.Please
Referring to Fig.2, Fig. 2 is the electrical block diagram of another embodiment of frequency generating circuit of the present invention.
The frequency generating circuit 20 of present embodiment includes signal source 201, phase discriminator 202, the first gating circuit 203, the
One resonance circuit 204, amplifier 205, feed circuit 206, the second gating circuit 207, voltage controlled oscillator 208, the second resonance electricity
Road 209 and filter circuit 210.
Wherein, signal source 201 is signal generator, for generating stable reference frequency.
Wherein, phase discriminator 202 is the device that can identify the difference of input signal, be input signal, feedback signal it
Between phase difference and its output voltage have the circuit of determining relationship.
Wherein, the first gating circuit 203 and the second gating circuit 207 be single-pole double-throw switch (SPDT), double-point double-throw switch or
The combination of at least two single-pole single-throw switch (SPST)s.For example, at least twin-channel gating IC.
Wherein, amplifier 205 is operational amplifier, and feed circuit 206 is frequency divider.
Voltage controlled oscillator 208 refers to that output frequency and input control voltage have the oscillating circuit (VCO) of corresponding relationship, vibrates
Control of the component parameters of the working condition of device or oscillation circuit by input control voltage.The type of voltage controlled oscillator 208 has LC
Voltage controlled oscillator, RC voltage controlled oscillator and phase noise.
Specifically, the signal input part of phase discriminator 202 and signal source 201 couple, the signal output end of phase discriminator 202 and the
The first input end of one gating circuit 203 couples, and the second input terminal of the first gating circuit 203 and the first power supply V1 are coupled, the
The control terminal of one gating circuit 203 couples external second source V2, and the fixing end of the first gating circuit 203 passes through the second resonance electricity
The coupling of the first input end of road 209 and filter circuit 210 and the second gating circuit 207, the fixing end of the second gating circuit 207
It is coupled with the input terminal of voltage controlled oscillator 208；The external second source V2 of the control terminal of second gating circuit 207；Voltage controlled oscillator
The input terminal of 208 output end coupling feed circuit 206；The signal input of the output end coupling phase discriminator 202 of feed circuit 206
End.
Cathode coupling of the signal output end of phase discriminator 202 also with one end of the first resonance circuit 204 and amplifier 205
It connects, the output end coupling of the fixing end and amplifier 205 of the other end of the first resonance circuit 204 and the first gating circuit 203,
The anode coupling third power supply V3 of amplifier 205, the output end of amplifier 205 couple the second input of the second gating circuit 207
End.
First gating circuit 203 and the second gating circuit 207 are used to control respectively when second source V2 exports the first level
The second input terminal for making the first gating circuit 203 and the second gating circuit 207 is connected to fixing end, with preset voltage controlled oscillator
208 voltage；First gating circuit 203 and the second gating circuit 207 are used for when second source V2 exports second electrical level, respectively
The first input end for controlling the first gating circuit 203 and the second gating circuit 207 is connected to fixing end, according to voltage controlled oscillator
208 preset voltage and the feedback frequency of voltage controlled oscillator 208 adjust the voltage of voltage controlled oscillator 208, work as voltage controlled oscillator
After 208 voltage stabilization, the output of voltage controlled oscillator 208 frequency corresponding with the voltage after stabilization.
Further, the second resonance circuit 209 includes the first resistor R1 and first capacitor C1 being serially connected；Second resonance
Circuit 209 further includes the second capacitor C2 in parallel with first resistor R1 and first capacitor C1.First resonance circuit 204 includes mutual
Concatenated 3rd resistor R3 and the 4th capacitor C4；First resonance circuit 204 further include with 3rd resistor R3 and the 4th capacitor C4 simultaneously
5th capacitor C5 of connection.
In order to inhibit the high-frequency noise of resonance circuit pole, filter circuit 210 in the present embodiment includes at least the
Two resistance R2 and third capacitor C3.Wherein, one end of second resistance R2 and one end of the second resonance circuit 209 couple, the second electricity
Hinder the first input end coupling of the other end and third capacitor C3 and the second gating circuit 207 of R2；Third capacitor C3's is another
End ground connection.In addition, better effect in order to obtain, can continue growing RC filtering loop in the filter circuit 210.
In the present embodiment, the first power supply V1, second source V2 and third power supply V3 are generated by external circuit.Its
In, third power supply V3 is that amplifier 205 provides DC offset voltage.What voltage caused by the first power supply V1 generated as needed
Frequency and determine, specifically, according to the output frequency of voltage controlled oscillator 208 and control voltage have certain relationship, can by frequency
Corresponding control voltage is released with counter.
It, can be using preset latch voltage by the way of, but due in batches in order to realize quick lock in and output frequency
The voltage of locking can be generated offset, so as to cause lock by the voltage controlled oscillator consistency problem of production and the influence of temperature
It fixes time longer, and consistency is poor.Present embodiment solves that foregoing problems can be effectively improved by the way of locking twice, with
Meet the requirement of private network communication.
Specifically, second source V2 is used to switch the first gating circuit 203 and the connection of the second gating circuit 207 is logical
Road.In one of them embodiment, second source V2 can export the first level and second electrical level, wherein the first level
For high level, second electrical level is low level.When second source V2 exports high level, the first gating circuit 203 is controlled respectively
Second input terminal is secured to end connection, and the second input terminal of the second gating circuit 207 is secured to end connection, which generates
Circuit 20 is locked for the first time, in the process, the control voltage generated by the first power supply V1, predetermined frequency generation circuit 20
In each node voltage, to generate reference voltage.In first time locking process, only the high frequency points zero pole point of circuit is connect
Enter into loop, to generate the reference voltage of each node, realizes the voltage-controlled voltage of preset voltage controlled oscillator 207.
After the voltage-controlled voltage of preset voltage controlled oscillator 207, second source V2 exports low level, controls the first choosing respectively
The first input end of circuit passband 203 is secured to end connection, and the first input end of the second gating circuit 207 is secured to end and connects
Logical, which is locked for the second time.In the process, signal source 201, phase discriminator 202, the first gating circuit
203, the first resonance circuit 204, amplifier 205, feed circuit 206, the second gating circuit 207, voltage controlled oscillator 208, second
Resonance circuit 209 and filter circuit 210 form the loop of closed loop, adaptively can accurately adjust each section according to the frequency to be locked
Point voltage, to export accurate frequency.Due in first time locking process, according to the electricity of each node of required frequency preset
Pressure, in secondary locking process, the voltage of each node can do small adaptive according to the frequency that voltage controlled oscillator 208 is fed back
The latch voltage that may make that voltage controlled oscillator 208 is stable should be adjusted i.e., the time of adjustment is shorter.
Meanwhile in second of locking process, low frequency point zero pole point is linked into loop, and is generated in entire frequency
Cheng Zhong, second locking play a leading role, and high-frequency noise can be effectively suppressed, and meet closed loop and mutually make an uproar performance.
Herein, it should be noted that the control terminal of the first gating circuit 203 and the second gating circuit 207 can also be distinguished
It is controlled by different voltage sources, need to only meet corresponding access conducting.
It is different from the prior art, the frequency generating circuit of present embodiment, using closed-loop adaptation control mode, passes through control
The conducting for making the corresponding channel of the first gating circuit and the second gating circuit, according to the voltage of the preset each node of locking frequency, then
The latch voltage of each node is accurately adjusted according to locking frequency, so that voltage controlled oscillator exports accurate frequency according to its latch voltage
Rate shortens the time of Frequency Locking, realizes the function of quick lock in and output frequency.
The above is only embodiments of the present invention, are not intended to limit scope of patent protection of the invention, all to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (10)
1. a kind of frequency generating circuit, which is characterized in that the frequency generating circuit includes:
Phase discriminator, the first gating circuit, the second gating circuit, the first resonance circuit, amplifier, voltage controlled oscillator and feedback electricity
Road；
The signal input part and signal source of the phase discriminator couple, the signal output end of the phase discriminator and the first gating electricity
The first input end on road couples, the second input terminal and the first supply coupling of first gating circuit, the first gating electricity
The control terminal on road couples external second source, and the first of the fixing end of first gating circuit and second gating circuit is defeated
Enter end coupling, the fixing end of second gating circuit and the input terminal of the voltage controlled oscillator couple；The second gating electricity
The external second source of the control terminal on road；The output end of the voltage controlled oscillator couples the input terminal of the feed circuit；Institute
The output end for stating feed circuit couples the signal input part of the phase discriminator；
The signal output end of the phase discriminator is also coupled with the cathode of one end of first resonance circuit and the amplifier,
The output end of the fixing end and the amplifier of the other end of first resonance circuit and first gating circuit couples,
The anode coupling third power supply of the amplifier, the output end of the amplifier couple the second input of second gating circuit
End；
First gating circuit and second gating circuit are used to control respectively when the second source exports the first level
The second input terminal for making first gating circuit and second gating circuit is connected to fixing end, with the preset voltage-controlled vibration
Swing the voltage of device；First gating circuit and second gating circuit are used to export second electrical level in the second source
When, first gating circuit is controlled respectively and the second gating circuit first input end is connected to fixing end, according to institute
The feedback frequency of the preset voltage and the voltage controlled oscillator of stating voltage controlled oscillator adjusts the voltage of the voltage controlled oscillator, when
After the voltage stabilization of the voltage controlled oscillator, the voltage controlled oscillator exports frequency corresponding with the voltage.
2. frequency generating circuit according to claim 1, which is characterized in that the feed circuit is frequency divider.
3. frequency generating circuit according to claim 1, which is characterized in that the frequency generating circuit further includes second humorous
Shake circuit, and the fixing end of one end of second resonance circuit and first gating circuit couples, second resonance circuit
The other end and second gating circuit first input end couple.
4. frequency generating circuit according to claim 3, which is characterized in that second resonance circuit includes being serially connected
First resistor and first capacitor；Second resonance circuit further includes in parallel with the first resistor and the first capacitor
Second capacitor.
5. frequency generating circuit according to claim 3, which is characterized in that the frequency generating circuit further includes filtered electrical
The one end on road, one end of the filter circuit and second resonance circuit couples, the other end of the filter circuit with it is described
The first input end of second gating circuit couples.
6. frequency generating circuit according to claim 5, which is characterized in that the filter circuit includes at least second resistance
With third capacitor；One end of one end of the second resistance and second resonance circuit couples, the second resistance it is another
End is coupled with the first input end of the third capacitor and second gating circuit；Another termination of the third capacitor
Ground.
7. frequency generating circuit according to claim 1, which is characterized in that first gating circuit is opened for single-pole double throw
It closes, the combination of double-point double-throw switch or at least two single-pole single-throw switch (SPST)s；
Second gating circuit is the combination of single-pole double-throw switch (SPDT), double-point double-throw switch or at least two single-pole single-throw switch (SPST)s.
8. frequency generating circuit according to claim 1, which is characterized in that first resonance circuit includes being serially connected
3rd resistor and the 4th capacitor；
First resonance circuit further includes fiveth capacitor in parallel with the 3rd resistor and the 4th capacitor.
9. the frequency generating circuit according to claim 1, which is characterized in that the amplifier is operation amplifier
Device.
10. the frequency generating circuit according to claim 1, which is characterized in that the signal source is signal
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810139065.2A CN110138383B (en) | 2018-02-09 | 2018-02-09 | Frequency generation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810139065.2A CN110138383B (en) | 2018-02-09 | 2018-02-09 | Frequency generation circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110138383A true CN110138383A (en) | 2019-08-16 |
| CN110138383B CN110138383B (en) | 2023-09-05 |
Family
ID=67568052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810139065.2A Active CN110138383B (en) | 2018-02-09 | 2018-02-09 | Frequency generation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110138383B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010019294A1 (en) * | 2000-02-25 | 2001-09-06 | Nobuyuki Itoh | Voltage controlled oscillator |
| CN101783677A (en) * | 2010-03-26 | 2010-07-21 | 海能达通信股份有限公司 | Locking method of phase-locked loop and locking circuit thereof |
| US20110157933A1 (en) * | 2009-12-26 | 2011-06-30 | Canon Kabushiki Kaisha | High voltage power supply |
| CN102122957A (en) * | 2011-03-31 | 2011-07-13 | 海能达通信股份有限公司 | Phase-locking loop rapid locking circuit and method |
| CN102545836A (en) * | 2011-12-30 | 2012-07-04 | 海能达通信股份有限公司 | Frequency generating unit and frequency fast locking method thereof |
| CN204669344U (en) * | 2015-07-08 | 2015-09-23 | 中国电子科技集团公司第五十四研究所 | A kind of phase-locked loop frequency prewired circuit |
| CN106559075A (en) * | 2015-09-30 | 2017-04-05 | 中星联华科技（北京）有限公司 | Numerical frequency source generator |
-
2018
- 2018-02-09 CN CN201810139065.2A patent/CN110138383B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010019294A1 (en) * | 2000-02-25 | 2001-09-06 | Nobuyuki Itoh | Voltage controlled oscillator |
| US20110157933A1 (en) * | 2009-12-26 | 2011-06-30 | Canon Kabushiki Kaisha | High voltage power supply |
| CN101783677A (en) * | 2010-03-26 | 2010-07-21 | 海能达通信股份有限公司 | Locking method of phase-locked loop and locking circuit thereof |
| CN102122957A (en) * | 2011-03-31 | 2011-07-13 | 海能达通信股份有限公司 | Phase-locking loop rapid locking circuit and method |
| CN102545836A (en) * | 2011-12-30 | 2012-07-04 | 海能达通信股份有限公司 | Frequency generating unit and frequency fast locking method thereof |
| CN204669344U (en) * | 2015-07-08 | 2015-09-23 | 中国电子科技集团公司第五十四研究所 | A kind of phase-locked loop frequency prewired circuit |
| CN106559075A (en) * | 2015-09-30 | 2017-04-05 | 中星联华科技（北京）有限公司 | Numerical frequency source generator |
Non-Patent Citations (2)
| Title |
|---|
| 聂彩吉等: "频率合成电子调谐器", 《电子天府》 * |
| 聂彩吉等: "频率合成电子调谐器", 《电子天府》, 31 December 1995 (1995-12-31), pages 62 - 75 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110138383B (en) | 2023-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20060033546A1 (en) | Configurable circuit structure having reduced susceptibility to interference when using at least two such circuits to perform like functions | |
| US9490969B2 (en) | Transmission apparatus, reception apparatus, and transmission and reception system | |
| US6703877B2 (en) | Clock shaping circuit and electronic equipment | |
| CN101854171A (en) | Multi-frequency point simulating phase-locked loop circuit | |
| CN101277178A (en) | Jitter-tolerance-enhanced cdr using a gdco-based phase detector | |
| US5621755A (en) | CMOS technology high speed digital signal transceiver | |
| CN101136631B (en) | Frequency synthesizer and frequency synthesis method | |
| US6608529B2 (en) | Frequency synthesis apparatus, systems, and methods | |
| CN201243273Y (en) | Temperature complement voltage-control constant temperature crystal oscillator | |
| CN104350681A (en) | Method and apparatus for local oscillator | |
| CN104702275A (en) | Low-phase-noise microwave frequency source circuit and equipment and method | |
| JP4124123B2 (en) | DATA AND CLOCK RECOVERY CIRCUIT, AND DEVICE HAVING A plurality of the above circuits | |
| CN109194308A (en) | The crystal oscillating circuit that multi-frequency automatically switches | |
| CN110138383A (en) | Frequency generating circuit | |
| CN209642644U (en) | A kind of frequency source and communication equipment | |
| CN205356307U (en) | Frequency synthesizer of short wave receiver | |
| EP1025645B1 (en) | Modified third order phase-locked loop | |
| US6882064B2 (en) | System to vary capacitance based on a control signal | |
| US20050036567A1 (en) | Voltage controlled oscillator (VCO) suitable for use in frequency shift keying (FSK) system | |
| CN209072442U (en) | The crystal oscillating circuit that multi-frequency automatically switches | |
| CN106209342B (en) | System for realizing low-frequency clock transmission in xDSL transmission system | |
| CN103490770B (en) | A kind of fast lockign apparatus based on C-band continuous wave answering machine | |
| CN105703768B (en) | Clock recovery device and receiver | |
| CN103607173B (en) | A kind of voltage controlled oscillator of variable voltage-controlled sensitivity | |
| CN103107809A (en) | Phase-locked loop circuit |
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 |