CN107317580A - A kind of high stability oscillator circuit and its implementation - Google Patents
A kind of high stability oscillator circuit and its implementation Download PDFInfo
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- CN107317580A CN107317580A CN201710534524.2A CN201710534524A CN107317580A CN 107317580 A CN107317580 A CN 107317580A CN 201710534524 A CN201710534524 A CN 201710534524A CN 107317580 A CN107317580 A CN 107317580A
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Classifications
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- 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
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
- H03L7/0991—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider
- H03L7/0992—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider comprising a counter or a frequency divider
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- 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
- H03L7/0802—Details of the phase-locked loop the loop being adapted for reducing power consumption
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- 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
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/089—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses
- H03L7/0891—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses the up-down pulses controlling source and sink current generators, e.g. a charge pump
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Abstract
The invention discloses a kind of high stability oscillator circuit and its implementation, the pierce circuit includes：Divide drive circuit, fractional frequency signal of the frequency divided by N for the oscillator signal that frequency for voltage controlled oscillator to be exported is Fout using output frequency as Fout/N is exported with phase fractional frequency signal and anti-phase fractional frequency signal to charge pump circuit to charge pump circuit, and by the frequency for Fout/N fractional frequency signal through processing；Charge pump circuit, the feedback current proportional with fractional frequency signal Fout/N frequencies for exporting reference current to frequency-current conversion circuit under being controlled at this with phase fractional frequency signal and anti-phase fractional frequency signal is compared and output error electric current；Low-pass filter circuit, for the error current to be converted into stable control voltage；Voltage controlled oscillator, the frequency for changing output signal under the control of the control voltage, by the present invention, realizes a kind of low-power consumption controlled based on closed loop frequency, high stability oscillator.
Description
Technical field
The present invention relates to a kind of pierce circuit and its implementation, more particularly to a kind of high stability oscillator circuit
And its implementation.
Background technology
Oscillator is the important component of contemporary electronic systems, and it is widely used in the neck such as electronics, communication, navigation aviation
Domain.
Fully integrated oscillator has LC oscillators, ring oscillator, relaxation oscillator etc. on conventional CMOS pieces, its frequency of oscillation
Influenceed significantly, to be unfavorable for real system application by process corner, supply voltage, temperature change.At present both at home and abroad on high stability
The design of fully integrated pierce circuit can be divided into two kinds of forms of open loop and closed loop from structure on piece, for open loop form, typically
Open loop temperature compensation is directly carried out to oscillator frequency using temperature-compensation circuit, its open loop structure precision is by certain limit
System, is influenceed greatly by process corner change and most later stage for needing complexity trims, and the fully integrated oscillator of closed loop configuration is compared to opening
For ring, due to the negative feedback structure of its own, the change of temperature and supply voltage can be suppressed simultaneously, make its output frequency stable
Du Genggao, but closed loop configuration is relative complex and power consumption is larger.
Therefore, it is necessary to provide a kind of low-power consumption controlled based on closed loop frequency, high stability oscillator.
The content of the invention
To overcome the shortcomings of that above-mentioned prior art is present, the purpose of the present invention is to provide a kind of high stability oscillator electricity
Road and its implementation, to realize a kind of low-power consumption controlled based on closed loop frequency, high stability oscillator.
In view of the above and other objects, the present invention proposes a kind of high stability oscillator circuit, including：
Divide drive circuit, for the frequency that exports voltage controlled oscillator for Fout oscillator signal frequency divided by N with
Output frequency is exported to charge pump circuit, and by the frequency for Fout/N fractional frequency signal for Fout/N fractional frequency signal through processing
With phase fractional frequency signal and anti-phase fractional frequency signal to charge pump circuit；
Charge pump circuit, for this with phase fractional frequency signal and anti-phase fractional frequency signal control under by reference current Iref with frequency
The feedback current If proportional to fractional frequency signal Fout/N frequencies of rate current converter circuit output is compared and output error
Electric current Iout；
Low-pass filter circuit, for error current Iout to be converted into stable control voltage Vc；
Voltage controlled oscillator, the frequency Fout for changing output signal under control voltage Vc control.
Further, the frequency dividing drive circuit exports this with phase fractional frequency signal by transmission gate, and it is anti-that inverted device exports this
Phase fractional frequency signal.
Further, the frequency dividing drive circuit includes Fractional-N frequency device, transmission gate and phase inverter, the input of the Fractional-N frequency device
The output end of the voltage controlled oscillator is connected, the frequency of Fractional-N frequency device output is connected to the transmission gate for Fout/N output signal
Input, the frequency input of the frequency-current conversion circuit of the input of the phase inverter and the charge pump circuit, the transmission
The output end of door and the phase inverter is connected to the charge pump circuit.
Further, the charge pump circuit includes a PMOS, NMOS tube, reference current source and frequency current conversion electricity
Road, the grid of the PMOS connects the output end of the transmission gate, and source electrode connects power positive end, and drain electrode connects reference current source Iref's
Input, the output end of the reference current source is connected to the current input terminal and low pass filter electricity of the frequency-current conversion circuit
Road, the current output terminal of the frequency-current conversion circuit is connected to the drain electrode of the NMOS tube, and it is anti-that the grid of the NMOS tube connects this
The output end of phase device, source electrode connects power supply negative terminal.
Further, the feedback current that frequency-current conversion circuit output is directly proportional to fractional frequency signal Fout/N frequencies.
Further, the low-pass filter circuit uses low-pass first order filter or second order or multistage RC low pass filters.
Further, the low-pass filter circuit includes an electric capacity and resistance R, and one end of the resistance connects the reference current
The output end in source, the other end is connected to one end of the electric capacity and the control end of the voltage controlled oscillator, another termination electricity of the electric capacity
Source negative terminal.
Further, the frequency that the voltage controlled oscillator is produced is FoutOscillator signal pass through the transmission after the Fractional-N frequency device
Door with phase inverter produce this with the switching signal of phase fractional frequency signal, anti-phase fractional frequency signal two-way opposite in phase control the PMOS,
NMOS tube switching tube is simultaneously turned on and turned off, periodically to control voltage VcCarry out discharge and recharge.
To reach above-mentioned purpose, the present invention also provides a kind of implementation method of high stability oscillator circuit, including as follows
Step：
Step one, the frequency divided by N for the oscillator signal for being Fout by the frequency that voltage controlled oscillator is exported using output frequency as
Fout/N fractional frequency signal is believed for Fout/N fractional frequency signal to charge pump circuit, and by the frequency through processing output with mutually frequency dividing
Number with anti-phase fractional frequency signal to charge pump circuit；
Step 2, using the charge pump circuit in the case where this is with phase fractional frequency signal and the control of anti-phase fractional frequency signal by reference current
The feedback proportional with fractional frequency signal Fout/N frequencies that the reference current Iref of source output is exported to frequency-current conversion circuit
Electric current If is compared and output error electric current Iout；
Step 3, stable control voltage Vc is converted to using low-pass filter circuit by error current Iout；
Step 4, changes the frequency Fout of output signal using voltage controlled oscillator under control voltage Vc control.
Further, in step one, the frequency that the voltage controlled oscillator is produced is FoutOscillator signal after Fractional-N frequency device
Producing this by transmission gate and phase inverter should with the switching signal control of phase fractional frequency signal, anti-phase fractional frequency signal two-way opposite in phase
The PMOS of charge pump circuit, NMOS tube switching tube are simultaneously turned on and turned off, with periodicity to control voltage VcCarry out discharge and recharge.
Compared with prior art, a kind of high stability oscillator circuit of the invention and its implementation are by by VCO
Fractional frequency signal of the frequency divided by N for the oscillator signal that the frequency of device output is Fout using output frequency as Fout/N is electric to charge pump
Road, and the frequency is exported with phase fractional frequency signal and anti-phase fractional frequency signal for Fout/N fractional frequency signal through processing so that the electricity
Lotus pump circuit is in the case where this is with phase fractional frequency signal and the control of anti-phase fractional frequency signal by reference current Iref and frequency-current conversion circuit
The feedback current If proportional to fractional frequency signal Fout/N frequencies of output is compared and output error electric current Iout, and is utilized
Error current Iout is converted to stable control voltage Vc by low-pass filter circuit, finally using voltage controlled oscillator in the control
Change the frequency Fout of output signal under voltage Vc processed control, realize a kind of low-power consumption controlled based on closed loop frequency, height
The purpose of stability oscillator.
Brief description of the drawings
Fig. 1 is a kind of circuit structure diagram of high stability oscillator circuit of the invention；
Fig. 2 is a kind of step flow chart of the implementation method of high stability oscillator circuit of the invention.
Embodiment
Below by way of specific instantiation and embodiments of the present invention are described with reference to the drawings, those skilled in the art can
Understand the further advantage and effect of the present invention easily by content disclosed in the present specification.The present invention can also pass through other differences
Instantiation implemented or applied, the various details in this specification also can based on different viewpoints with application, without departing substantially from
Various modifications and change are carried out under the spirit of the present invention.
Fig. 1 is a kind of circuit structure diagram of high stability oscillator circuit of the invention.As shown in figure 1, the present invention is a kind of high
Stability oscillator circuit, including：Frequency dividing drive circuit 10, charge pump circuit 20, low-pass filter circuit 30 and voltage-controlled shake
Swing device 40.
Wherein, drive circuit 10, including Fractional-N frequency device Div1, transmission gate T1 and phase inverter INV1 are divided, for being shaken voltage-controlled
Fractional frequency signal charge pump of the frequency divided by N for the oscillator signal that the frequency for swinging the output of device 40 is Fout using output frequency as Fout/N
Circuit, and frequency is exported with phase fractional frequency signal S1, inverted device INV1 output for Fout/N fractional frequency signal through transmission gate T1
Anti-phase fractional frequency signal S2 is to charge pump circuit 20；Charge pump circuit 20, including PMOS M1, NMOS tube M2, reference current source
Iref and frequency-current conversion circuit (FIC) F1, for being incited somebody to action under same phase fractional frequency signal S1 and anti-phase fractional frequency signal S2 controls
The feedback electricity that what reference current Iref was exported to frequency-current conversion circuit (FIC) F1 be directly proportional to fractional frequency signal Fout/N frequencies
Stream If is compared and output error electric current Iout；Low-pass filter circuit 30 is the first-order low-pass that resistance R and electric capacity C is constituted
Ripple device, for error current Iout to be converted into stable control voltage Vc, it would however also be possible to employ second order or multistage RC LPFs
Device；Voltage controlled oscillator 40 is the oscillator that common voltage controls frequency, for changing output letter under control voltage Vc control
Number frequency Fout.
The output of voltage controlled oscillator VCO 1 is connected to subsequent conditioning circuit (not shown) and frequency divider Div1 input, frequency divider
The frequency of Div1 outputs is connected to transmission gate T1 input, phase inverter INV1 input and frequency for Fout/N output signal
Rate current converter circuit (FIC) F1 frequency input, transmission gate T1 output end is connected to PMOS M1 grid, phase inverter
INV1 output end is connected to NMOS tube M2 grid, and PMOS M1 source electrode is connected to power positive end VDD, NMOS tube M2 source
Pole be connected to power supply negative terminal (), PMOS M1 drain electrode is connected to reference current source Iref input, reference current source
Iref output end is connected to frequency-current conversion circuit (FIC) F1 current input terminal and resistance R one end, and frequency current turns
The current output terminal for changing circuit (FIC) F1 is connected to NMOS tube M2 drain electrode, and the resistance R other end is connected to electric capacity C one end
With the control end of voltage controlled oscillator VCO 1, electric capacity C another termination power supply negative terminal ()；It is frequency divider Div1, transmission gate T1, anti-phase
Device INV1 and voltage controlled oscillator VCO 1 are both needed to connect respective power supply and ground.
It can be seen that, voltage controlled oscillator VCO 1 produces frequency according to the control voltage VC of input and believed for Fout periodic swinging
Number；Frequency divider Div1 effects are that oscillation signal frequency is reduced into N times；Frequency-current conversion circuit (FIC) is by input frequency signal
Corresponding current value is converted to, with linear relationship, is met：
The operation principle of the present invention is as follows：
The frequency F that voltage controlled oscillator VCO 1 is producedoutThe divided device Div1 of oscillator signal after by transmission gate T1 with it is anti-phase
Device INV1 produces switching signal control M1, M2 switching tube with phase fractional frequency signal S1, anti-phase fractional frequency signal S2 two-way opposite in phase
Simultaneously turn on and turn off, with periodicity to control voltage VcDischarge and recharge is carried out, charge pump circuit periodically work contributes to drop
Low circuit system power dissipation.The I that turn-on cycle internal reference current source is producedrefElectric current and IfElectric current compares, and output current value is two
The difference of person：
If Iout>0 → to VcProgress is charged → voltage VcIncrease → frequency increases → electric current IfIncrease → IoutReduce, so
Repeatedly, until Iref=If, the frequency expression of stable oscillation stationary vibration frequency is：
Resistance R, electric capacity C composition low-pass filter circuit are used for reducing control voltage Vc ripples, the frequency of systems stabilisation output
Fout。
It can be analyzed by final output frequency expression formula, because frequency dividing ratio N, frequency current conversion coefficient α are solid
Definite value, it is only related to Iref by the frequency of oscillation obtained after feedback control, so by design and craft angle, supply voltage,
The unrelated reference current source of operating temperature, can obtain the same oscillator signal with high stability.
Fig. 2 is a kind of step flow chart of the implementation method of high stability oscillator circuit of the invention.As shown in Fig. 2 this
A kind of implementation method of high stability oscillator circuit is invented, is comprised the following steps：
Step 201, the frequency divided by N for the oscillator signal for being Fout by the frequency that voltage controlled oscillator is exported using output frequency as
Fout/N fractional frequency signal is believed for Fout/N fractional frequency signal to charge pump circuit, and by the frequency through processing output with mutually frequency dividing
Number with anti-phase fractional frequency signal to charge pump circuit；
Step 202, by charge pump circuit in the case where this is with phase fractional frequency signal and the control of anti-phase fractional frequency signal by the reference current
The feedback current proportional with fractional frequency signal Fout/N frequencies that the reference current Iref in source is exported to frequency-current conversion circuit
If is compared and output error electric current Iout；
Step 203, error current Iout is converted into stable control voltage Vc using low-pass filter circuit；
Step 204, the frequency Fout of output signal is changed under control voltage Vc control using voltage controlled oscillator.
Specifically, the frequency that the voltage controlled oscillator is produced is FoutOscillator signal after Fractional-N frequency device by transmission gate with
Phase inverter produces the switching signal with phase fractional frequency signal, anti-phase fractional frequency signal two-way opposite in phase, and the charge pump circuit is at this
With export reference current Iref with frequency-current conversion circuit under phase fractional frequency signal and the control of anti-phase fractional frequency signal and frequency dividing
The proportional feedback current If of signal Fout/N frequencies be compared output error electric current Iout to low-pass filter circuit (including
Electric capacity and resistance), in the specific embodiment of the invention, this controls the charge pump respectively with phase fractional frequency signal, anti-phase fractional frequency signal
The PMOS of circuit, NMOS tube switching tube are simultaneously turned on and turned off, and then periodically to control voltage VcCarry out discharge and recharge, electricity
The periodically work of lotus pump circuit helps to reduce circuit system power consumption.
In summary, a kind of high stability oscillator circuit of the invention and its implementation are by the way that voltage controlled oscillator is exported
Frequency be Fout oscillator signal fractional frequency signal using output frequency as Fout/N of frequency divided by N to charge pump circuit, and
The frequency is exported with phase fractional frequency signal and anti-phase fractional frequency signal for Fout/N fractional frequency signal through processing so that charge pump electricity
What road exported reference current Iref and frequency-current conversion circuit in the case where this is with phase fractional frequency signal and the control of anti-phase fractional frequency signal
The feedback current If proportional to fractional frequency signal Fout/N frequencies is compared and output error electric current Iout, and utilizes low pass filtered
Error current Iout is converted to stable control voltage Vc by ripple device circuit, finally using voltage controlled oscillator in the control voltage
Change the frequency Fout of output signal under Vc control, realize a kind of low-power consumption controlled based on closed loop frequency, high stability
The purpose of oscillator.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.Any
Art personnel can be modified above-described embodiment and changed under the spirit and scope without prejudice to the present invention.Therefore,
The scope of the present invention, should be as listed by claims.
Claims (10)
1. a kind of high stability oscillator circuit, including：
Drive circuit is divided, for the frequency that exports voltage controlled oscillator for the frequency divided by N of Fout oscillator signal to export
Frequency exports same phase for Fout/N fractional frequency signal to charge pump circuit, and by the frequency for Fout/N fractional frequency signal through processing
Fractional frequency signal and anti-phase fractional frequency signal to charge pump circuit；
Charge pump circuit, for this with phase fractional frequency signal and anti-phase fractional frequency signal control under by reference current Iref and frequency electricity
The feedback current If proportional to fractional frequency signal Fout/N frequencies that circuit output is changed in circulation is compared and output error electric current
Iout；
Low-pass filter circuit, for error current Iout to be converted into stable control voltage Vc；
Voltage controlled oscillator, the frequency Fout for changing output signal under control voltage Vc control.
2. a kind of high stability oscillator circuit as claimed in claim 1, it is characterised in that：The frequency dividing drive circuit is by passing
Defeated door exports this with phase fractional frequency signal, and inverted device exports the anti-phase fractional frequency signal.
3. a kind of high stability oscillator circuit as claimed in claim 2, it is characterised in that：The frequency dividing drive circuit includes N
Frequency divider, transmission gate and phase inverter, the input of the Fractional-N frequency device connect the output end of the voltage controlled oscillator, and the Fractional-N frequency device is defeated
The frequency gone out is connected to the input of the transmission gate, the input of the phase inverter and charge pump electricity for Fout/N output signal
The output end of the frequency input of the frequency-current conversion circuit on road, the transmission gate and the phase inverter is connected to charge pump electricity
Road.
4. a kind of high stability oscillator circuit as claimed in claim 3, it is characterised in that：The charge pump circuit includes one
PMOS, NMOS tube, reference current source and frequency-current conversion circuit, the grid of the PMOS connect the output of the transmission gate
End, source electrode connects power positive end, and drain electrode connects reference current source Iref input, and the output end of the reference current source is connected to this
The current input terminal and low-pass filter circuit of frequency-current conversion circuit, the current output terminal of the frequency-current conversion circuit connect
The drain electrode of the NMOS tube is connected to, the grid of the NMOS tube connects the output end of the phase inverter, and source electrode connects power supply negative terminal.
5. a kind of high stability oscillator circuit as claimed in claim 4, it is characterised in that：The frequency-current conversion circuit is defeated
Go out the feedback current being directly proportional to fractional frequency signal Fout/N frequencies.
6. a kind of high stability oscillator circuit as claimed in claim 4, it is characterised in that：The low-pass filter circuit is used
Low-pass first order filter or second order or multistage RC low pass filters.
7. a kind of high stability oscillator circuit as claimed in claim 6, it is characterised in that：The low-pass filter circuit includes
One electric capacity and resistance R, one end of the resistance connect the output end of the reference current source, the other end be connected to the electric capacity one end and
The control end of the voltage controlled oscillator, another termination power supply negative terminal of the electric capacity.
8. a kind of high stability oscillator circuit as claimed in claim 4, it is characterised in that：The frequency that the voltage controlled oscillator is produced
Rate is FoutOscillator signal this is produced with phase fractional frequency signal, anti-phase frequency dividing by the transmission gate and phase inverter after the Fractional-N frequency device
The switching signal of signal two-way opposite in phase controls the PMOS, NMOS tube switching tube to simultaneously turn on and turn off, periodically to control
Voltage V processedcCarry out discharge and recharge.
9. a kind of implementation method of high stability oscillator circuit, comprises the following steps：
Step one, the frequency divided by N for the oscillator signal for being Fout by the frequency that voltage controlled oscillator is exported are using output frequency as Fout/
N fractional frequency signal to charge pump circuit, and by the frequency for Fout/N fractional frequency signal through processing output with phase fractional frequency signal with
Anti-phase fractional frequency signal is to charge pump circuit；
Step 2, using the charge pump circuit this with phase fractional frequency signal and anti-phase fractional frequency signal control under reference current source is defeated
The feedback current proportional with fractional frequency signal Fout/N frequencies that the reference current Iref gone out is exported to frequency-current conversion circuit
If is compared and output error electric current Iout；
Step 3, stable control voltage Vc is converted to using low-pass filter circuit by error current Iout；
Step 4, changes the frequency Fout of output signal using voltage controlled oscillator under control voltage Vc control.
10. a kind of implementation method of high stability oscillator circuit as claimed in claim 9, it is characterised in that：In step one
In, the frequency that the voltage controlled oscillator is produced is FoutOscillator signal to produce this by transmission gate and phase inverter after Fractional-N frequency device same
Phase fractional frequency signal, the switching signal of anti-phase fractional frequency signal two-way opposite in phase control the PMOS of the charge pump circuit, NMOS tube
Switching tube is simultaneously turned on and turned off, with periodicity to control voltage VcCarry out discharge and recharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710534524.2A CN107317580B (en) | 2017-07-03 | 2017-07-03 | High-stability oscillator circuit and implementation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710534524.2A CN107317580B (en) | 2017-07-03 | 2017-07-03 | High-stability oscillator circuit and implementation method thereof |
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| CN107317580A true CN107317580A (en) | 2017-11-03 |
| CN107317580B CN107317580B (en) | 2020-09-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054910A (en) * | 2021-03-11 | 2021-06-29 | 四川中微芯成科技有限公司 | Capacitance oscillation circuit, capacitance detection circuit and detection method |
| CN114553193A (en) * | 2022-04-27 | 2022-05-27 | 灵矽微电子(深圳)有限责任公司 | Clock generation circuit and device insensitive to supply voltage and temperature |
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| US5608463A (en) * | 1992-08-26 | 1997-03-04 | Nec Corporation | Oscillator circuit suitable for picture-in-picture system |
| EP0945986A2 (en) * | 1998-03-26 | 1999-09-29 | Nec Corporation | Charge pump circuit for PLL |
| CN103873054A (en) * | 2014-03-31 | 2014-06-18 | 杭州士兰微电子股份有限公司 | Clock generator |
| CN104124968A (en) * | 2014-08-06 | 2014-10-29 | 西安电子科技大学 | Clock duty ratio calibration circuit for streamlined analog-digital converter |
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2017
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5608463A (en) * | 1992-08-26 | 1997-03-04 | Nec Corporation | Oscillator circuit suitable for picture-in-picture system |
| EP0945986A2 (en) * | 1998-03-26 | 1999-09-29 | Nec Corporation | Charge pump circuit for PLL |
| CN103873054A (en) * | 2014-03-31 | 2014-06-18 | 杭州士兰微电子股份有限公司 | Clock generator |
| CN104124968A (en) * | 2014-08-06 | 2014-10-29 | 西安电子科技大学 | Clock duty ratio calibration circuit for streamlined analog-digital converter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054910A (en) * | 2021-03-11 | 2021-06-29 | 四川中微芯成科技有限公司 | Capacitance oscillation circuit, capacitance detection circuit and detection method |
| CN114553193A (en) * | 2022-04-27 | 2022-05-27 | 灵矽微电子(深圳)有限责任公司 | Clock generation circuit and device insensitive to supply voltage and temperature |
| CN114553193B (en) * | 2022-04-27 | 2022-08-09 | 灵矽微电子(深圳)有限责任公司 | Clock generation circuit and apparatus insensitive to supply voltage and temperature |
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| Publication number | Publication date |
|---|---|
| CN107317580B (en) | 2020-09-15 |
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