CN106059573B - Reduce the circuit and method of the charge pump phase locking loop circuit switching signal amplitude of oscillation - Google Patents
Reduce the circuit and method of the charge pump phase locking loop circuit switching signal amplitude of oscillation Download PDFInfo
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- CN106059573B CN106059573B CN201610369764.7A CN201610369764A CN106059573B CN 106059573 B CN106059573 B CN 106059573B CN 201610369764 A CN201610369764 A CN 201610369764A CN 106059573 B CN106059573 B CN 106059573B
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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
- H03L7/085—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 present invention provides a kind of circuit and method for reducing the charge pump phase locking loop circuit switching signal amplitude of oscillation, wherein the circuit includes power circuit unit, provides a working power；First load circuit unit, is connected to the power circuit unit, forms the first circuit for accessing the working power；Second load circuit unit, is connected to the power circuit unit, forms second servo loop for accessing the working power, the second load circuit unit further includes switching signal incoming end；The switching signal incoming end is when receiving switching signal, second servo loop conducting/the blocking is set to change the size that the working power flows into electric current in first circuit, the present invention can effectively reduce the switching signal amplitude of oscillation pair in phase detector circuit, and circuit structure provided by the present invention is more simple, manufacturing cost is lower, significant effect.
Description
Technical field
The present invention relates to electronic circuit technologies, more particularly to a kind of reduction charge pump phase locking loop circuit switching signal amplitude of oscillation
Circuit and method.
Background technique
Existing charge pump phase lock loop structure such as Fig. 1, including phase frequency detector 10, charge pump 20, filter 30, voltage controlled oscillation
Device 40 and frequency divider 50, phase frequency detector 10 are used to compare the phase and difference on the frequency of even signal, and generate control signal to electricity
Lotus pump 20, then charge pump 20 correspondingly gives 30 charge and discharge of filter, and 40 output frequency of voltage controlled oscillator is proportional to loop at this time
Control voltage on filter 20 finally makes the output signal of reference clock and frequency divider with the same phase of frequency.
Fig. 2 is the circuit diagram of the charge pump in existing charge pump type phaselocked loop circuit, as shown, with the closure of switch
Or it disconnects, upper and lower current source (IupAnd Idown) to two capacitor (capacitor CdumpAnd Clf) injection or extracted current.Metal-oxide-semiconductor switchs
When (including K1, K2, K3, K4), need to consider Charge injection effect.If using NMOS tube as switch, switching signal is high level
When be connected, Charge injection effect cause electronics by capacitor flow to switch, increase the voltage value on capacitor；Switching signal is low electricity
It usually disconnects, electronics flows to capacitor by switching, and reduces the voltage value on capacitor.If using PMOS tube as switch, switching signal
To disconnect when high level, Charge injection effect causes hole to flow to capacitor by switching, and increases the voltage value on capacitor；Switch letter
Number be low level when be connected, hole by capacitor flow to switch, reduce the voltage value on capacitor.Switching signal carrys out phase locked loop electricity
The output of phase frequency detector logic gate in road, the general amplitude of oscillation are all from ground voltage to supply voltage.So big voltage becomes
When change will lead to switching signal transition, the voltage on capacitor is shaken, wherein capacitor ClfOn voltage be voltage controlled oscillator
Control voltage (Vctrl), its shake will lead to the deterioration of pll output signal noiseproof feature.
In the prior art, to inhibit Charge injection effect relevant with input signal, can generally be made using bootstrapped switch
The gate source voltage of switching tube and input signal are relatively independent, more acceptable to the long arc from ground voltage to supply voltage.But this
The circuit structure of bootstrapped switch is complicated, needs to use four switches in charge pump circuit, if entirely using bootstrapped switch, cost is too
It is high.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of reduction charge pump phase lock loop electricity
The circuit and method of the path switching signal amplitude of oscillation reduce switching tube in charge pump for solving using bootstrapped switch in the prior art
Voltage swing and lead to the cost circuits problem that structure is complicated and cost is excessively high.
In order to achieve the above objects and other related objects, the present invention the following technical schemes are provided:
It is a kind of for reducing the level shifting circuit of the switching signal amplitude of oscillation, comprising: power circuit unit, provide a job electricity
Source；First load circuit unit, is connected to the power circuit unit, forms the first circuit for accessing the working power；
Second load circuit unit, is connected to the power circuit unit, forms second servo loop for accessing the working power, described
Second load circuit unit further includes switching signal incoming end；The switching signal incoming end makes when receiving switching signal
Second servo loop conducting/the blocking changes the size that the working power flows into electric current in first circuit.
Preferably, the voltage range of the switching signal is 0-1.2V.
Preferably, the voltage range of the level shifting circuit output is 0.35-0.75V.
Preferably, the first load circuit unit includes the first NMOS tube, and the drain electrode of first NMOS tube is connected to
The power circuit unit accesses the working power, and the grid of first NMOS tube is connected to first NMOS tube
Drain electrode, the source electrode ground connection of first NMOS tube；The second load circuit unit includes the second NMOS tube and third NMOS tube,
The drain electrode of second NMOS tube is connected to the power circuit unit to access the working power, second NMOS tube
Grid is connected to the drain electrode of the third NMOS tube, institute as the switching signal incoming end, the source electrode of second NMOS tube
The grid for stating third NMOS tube is connected to the drain electrode of the third NMOS tube, the source electrode ground connection of the third NMOS tube；The electricity
Source circuit unit includes the first PMOS tube and the second PMOS tube, and first PMOS tube is connected to a power supply, the first PMOS
The drain electrode of pipe connects the source electrode of second PMOS tube, and the grid of first PMOS tube connects the first bias voltage, and described the
The grids of two PMOS tube connects the second bias voltage, the drain electrode of second PMOS tube be connected to first NMOS tube and
The drain electrode of second NMOS tube, and the output as the level shifting circuit.
In addition, the present invention also provides a kind of charge pump phase locking loop circuit, including described for reducing the switching signal amplitude of oscillation
Level shifting circuit, be connected in the charge pump phase locking loop circuit between phase frequency detector and voltage controlled oscillator.
In addition, the present invention also provides a kind of for reducing the level conversion method of the switching signal amplitude of oscillation, which comprises
One working power is provided, is connected to the first load circuit unit and the second load circuit unit to form the first circuit and
Secondary circuit；Switching signal incoming end in the second load circuit unit makes described second time when receiving switching signal
Road conducting/blocking changes the size that the working power flows into electric current in first circuit.
As described above, the invention has the following advantages: the present invention, which can effectively reduce, switchs letter in phase detector circuit
Number amplitude of oscillation pair, and circuit structure provided by the present invention is more simple, and manufacturing cost is lower, significant effect.
Detailed description of the invention
Fig. 1 is the schematic diagram of existing charge pump phase lock loop.
Fig. 2 is a kind of circuit diagram of the charge pump in existing charge pump type phaselocked loop circuit.
Fig. 3 is that the present invention is a kind of for reducing the schematic diagram of the level shifting circuit of the switching signal amplitude of oscillation.
Fig. 4 is that the present invention is a kind of for reducing the circuit in one embodiment of the level shifting circuit of the switching signal amplitude of oscillation
Figure.
Fig. 5 is a kind of schematic diagram of charge pump phase locking loop circuit of the present invention.
Drawing reference numeral explanation
10 phase frequency detectors
20 charge pumps
30 filters
40 voltage controlled oscillators
50 frequency dividers
60 level shifting circuits
601 power circuit units
602 first load circuit units
603 second load circuit units
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that illustrating the basic structure that only the invention is illustrated in a schematic way provided in following embodiment
Think, only shown in schema then with related component in the present invention rather than component count, shape and size when according to actual implementation
Draw, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel
It is likely more complexity.
Embodiment 1
See Fig. 3, the present invention provides a kind of for reducing the level shifting circuit 60 of the switching signal amplitude of oscillation, including power supply electricity
Road unit 601, the first load circuit unit 602 and the second load circuit unit 603, wherein power circuit unit 601 provides one
Working power；First load circuit unit 602 is connected to the power circuit unit 601, for accessing the working power shape
At the first circuit；Second load circuit unit 603 is connected to the power circuit unit 601, for accessing the working power
Second servo loop is formed, the second load circuit unit 603 further includes switching signal incoming end；The switching signal incoming end
VIN makes the second servo loop conducting/blocking when receiving switching signal to change the working power and flow into described first time
The size of electric current in road.
The voltage swing of switching signal can be converted into the electricity drawn on the first circuit by level shifting circuit 60
The size of the output institute output voltage of flat conversion circuit 60 can make second time conducting or resistance according to switching signal under different voltages
It is disconnected, to form current distributing back to first or not shunt, electricity is exported in the output of level shifting circuit 60 to change
The variation of pressure, and this variation is much smaller compared to the variation of switching signal, to reach the mesh for reducing the switching signal amplitude of oscillation
's.
Further, see Fig. 4, can implement according to Fig. 4 institute to circuit structure above-mentioned for reducing the switching signal amplitude of oscillation
Level shifting circuit 60.
Specifically, the first load circuit unit 602 includes the first NMOS tube, and the drain electrode of first NMOS tube connects
The working power is accessed in the power circuit unit 601, the grid of first NMOS tube is connected to described first
The drain electrode of NMOS tube, the source electrode ground connection of first NMOS tube.
Specifically, the second load circuit unit 603 includes the second NMOS tube and third NMOS tube, the 2nd NMOS
The drain electrode of pipe is connected to the power circuit unit 601 to access the working power, the grid conduct of second NMOS tube
The switching signal incoming end VIN, the source electrode of second NMOS tube are connected to the drain electrode of the third NMOS tube, the third
The grid of NMOS tube is connected to the drain electrode of the third NMOS tube, the source electrode ground connection of the third NMOS tube.
Specifically, the power circuit unit 601 includes the first PMOS tube and the second PMOS tube, and first PMOS tube connects
It is connected to a power supply, the drain electrode of first PMOS tube connects the source electrode of second PMOS tube, the grid of first PMOS tube
The first bias voltage V1 is connected, the grid of second PMOS tube connects the second bias voltage V2, the leakage of second PMOS tube
Pole is connected to the drain electrode of first NMOS tube and the second NMOS tube, and the output as the level shifting circuit 60
VOUT。
The working principle of above-mentioned the given circuit structure of Fig. 4 are as follows: be in the switching signal that switching signal incoming end VIN is inputted
When high level, the second NMOS tube and the branch conducting of third NMOS tube place, come from the first PMOS tube and second in second servo loop
PMOS tube composition power circuit unit 601 export operating current VCC some flow through the second NMOS tube and the 3rd NMOS
Branch where pipe, therefore the electric current for flowing through the first circuit reduces, 60 output voltage of level shifting circuit reduces；It is accessed in switching signal
When the switching signal that end VIN is inputted is low level, the second NMOS tube and third NMOS tube place branch are blocked in second servo loop,
The operating current that the power circuit unit 601 formed from the first PMOS tube and the second PMOS tube exports all flows through first time
Road, 60 output voltage of level shifting circuit increase.
Specifically, the switching signal incoming end VIN in the present embodiment can be connected on phase frequency detector 10 and is accessed
Switching signal remakes the switching tube used in charge pump 20 after the level shifting circuit 60 that the switching signal provides through this embodiment
Grid on, so as to avoid voltage in charge pump 20 from shaking, and then avoid pll output signal noiseproof feature
Deteriorate.
Preferably, level shifting circuit 60 provided by the invention can be converted to 0 to 1.2V switching signal
The signal of 0.35V to 0.75V.
Embodiment 2
Level shifting circuit 60 in above-described embodiment 1 is applied in 20 phase-locked loop circuit of charge pump by the present embodiment, is used
To reduce the amplitude of oscillation of switching signal in 20 phase-locked loop circuit of charge pump.
Specifically, 5 are referred to, a kind of 20 phase-locked loop circuit of charge pump, including phase frequency detector 10, charge pump 20, filtering
Device 30, voltage controlled oscillator 40, frequency divider 50 and level shifting circuit 60, wherein the input of charge pump 20 is connected to frequency and phase discrimination
The output of device 10, the input of the output connection filter 30 of charge pump 20, the output of filter 30 are connected to voltage controlled oscillator 40
Input, the output of voltage controlled oscillator 40 is connected to the input of phase frequency detector 10, not with 20 phase-locked loop circuit of existing charge pump
With, be also connected with level shifting circuit 60 between phase frequency detector 10 and charge pump 20, level shifting circuit 60 it is defeated
Enter to be connected to the output of phase frequency detector 10, the output of level shifting circuit 60 is connected to the input of charge pump 20.
Through the above scheme, it can will pass through such level conversion electricity from the switching signal of phase frequency detector 10
It is remake behind road 60 on the grid of the switching tube of charge pump 20, so as to avoid voltage in charge pump 20 from shaking, into
And avoid the deterioration of pll output signal noiseproof feature.
Preferably, level shifting circuit 60 provided by the invention can be converted to 0 to 1.2V switching signal
The signal of 0.35V to 0.75V.
Embodiment 3
The present embodiment also provides a kind of for reducing the level conversion method of the switching signal amplitude of oscillation, may include following reality
Existing step:
S1 provides a working power, is connected to the first load circuit unit 602 and the second load circuit unit 603
To form the first circuit and second servo loop；
S2, the switching signal incoming end in the second load circuit unit 603 make described when receiving switching signal
Second servo loop conducting/blocking changes the size that the working power flows into electric current in first circuit.
Above-mentioned level conversion method remakes after being converted the switching signal that phase frequency detector exports used in charge
On the grid of the switching tube of pump, so as to avoid voltage in charge pump from shaking, and then pll output signal is avoided to make an uproar
The deterioration of acoustic performance.0 to 1.2V switching signal can be converted to 0.35V extremely by level conversion method provided by the invention
The signal of 0.75V.
In conclusion the present invention can effectively reduce the switching signal amplitude of oscillation pair in phase detector circuit, and the present invention is mentioned
The circuit structure of confession is more simple, and manufacturing cost is lower, significant effect.So the present invention effectively overcome it is in the prior art
Various shortcoming and have high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (10)
1. a kind of for reducing the level shifting circuit of the switching signal amplitude of oscillation, which is characterized in that it is connected to charge pump phase lock loop
In circuit between phase frequency detector and voltage controlled oscillator, the level shifting circuit is specifically included:
Power circuit unit provides a working power；
First load circuit unit, is connected to the power circuit unit, forms the first circuit for accessing the working power；
Second load circuit unit, is connected to the power circuit unit, forms second servo loop for accessing the working power,
The second load circuit unit further includes switching signal incoming end；The switching signal incoming end is receiving switching signal
When, so that the second servo loop conducting/blocking is changed the size that the working power flows into electric current in first circuit.
2. according to claim 1 for reducing the level shifting circuit of the switching signal amplitude of oscillation, which is characterized in that described to open
The voltage range of OFF signal is 0-1.2V.
3. according to claim 2 for reducing the level shifting circuit of the switching signal amplitude of oscillation, which is characterized in that the electricity
The voltage range that circuit output is changed in flat turn is 0.35-0.75V.
4. according to claim 1 for reducing the level shifting circuit of the switching signal amplitude of oscillation, which is characterized in that described the
One load circuit unit includes the first NMOS tube, and the drain electrode of first NMOS tube is connected to the power circuit unit to access
The working power, the grid of first NMOS tube are connected to the drain electrode of first NMOS tube, first NMOS tube
Source electrode ground connection.
5. according to claim 4 for reducing the level shifting circuit of the switching signal amplitude of oscillation, which is characterized in that described the
Two load circuit units include the second NMOS tube and third NMOS tube, and the drain electrode of second NMOS tube is connected to the power supply electricity
Road unit accesses the working power, and the grid of second NMOS tube is as the switching signal incoming end, and described second
The source electrode of NMOS tube is connected to the drain electrode of the third NMOS tube, and the grid of the third NMOS tube is connected to the 3rd NMOS
The drain electrode of pipe, the source electrode ground connection of the third NMOS tube.
6. according to claim 5 for reducing the level shifting circuit of the switching signal amplitude of oscillation, which is characterized in that the electricity
Source circuit unit includes the first PMOS tube and the second PMOS tube, and first PMOS tube is connected to a power supply, the first PMOS
The drain electrode of pipe connects the source electrode of second PMOS tube, and the grid of first PMOS tube connects the first bias voltage, and described the
The grids of two PMOS tube connects the second bias voltage, the drain electrode of second PMOS tube be connected to first NMOS tube and
The drain electrode of second NMOS tube, and the output as the level shifting circuit.
7. a kind of charge pump phase locking loop circuit, it is characterised in that: including such as of any of claims 1-6 for reducing
The level shifting circuit of the switching signal amplitude of oscillation.
8. a kind of for reducing the level conversion method of the switching signal amplitude of oscillation, which is characterized in that the described method includes:
One working power is provided, is connected to the first load circuit unit and the second load circuit unit to form the first circuit
And second servo loop；
Switching signal incoming end in the second load circuit unit leads the second servo loop when receiving switching signal
It is logical/to block to change the size that the working power flows into electric current in first circuit；
The level conversion method remakes the switch used in charge pump after being converted the switching signal that phase frequency detector exports
On the grid of pipe.
9. according to claim 8 for reducing the level conversion method of the switching signal amplitude of oscillation, which is characterized in that described to open
The voltage range of OFF signal is 0-1.2V.
10. according to claim 9 for reducing the level conversion method of the switching signal amplitude of oscillation, which is characterized in that described
The voltage range that switching signal is exported after the level shifting circuit is converted is 0.35-0.75V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610369764.7A CN106059573B (en) | 2016-05-30 | 2016-05-30 | Reduce the circuit and method of the charge pump phase locking loop circuit switching signal amplitude of oscillation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610369764.7A CN106059573B (en) | 2016-05-30 | 2016-05-30 | Reduce the circuit and method of the charge pump phase locking loop circuit switching signal amplitude of oscillation |
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| Publication Number | Publication Date |
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| CN106059573A CN106059573A (en) | 2016-10-26 |
| CN106059573B true CN106059573B (en) | 2019-03-29 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2694619Y (en) * | 2004-04-05 | 2005-04-20 | 上海迪申电子科技有限责任公司 | C-MOS electric charge pump |
| WO2008064464A1 (en) * | 2006-11-30 | 2008-06-05 | Mosaid Technologies Incorporated | Circuit for clamping current in a charge pump |
| CN102347760A (en) * | 2010-07-27 | 2012-02-08 | 中兴通讯股份有限公司 | Charge pump and phase locked loop using charge pump |
| CN103178842A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | A phase-locked loop signal source with ECL phase detector and its generation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4371893B2 (en) * | 2004-04-27 | 2009-11-25 | セイコーＮｐｃ株式会社 | Charge pump circuit and PLL circuit using the charge pump circuit |
-
2016
- 2016-05-30 CN CN201610369764.7A patent/CN106059573B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2694619Y (en) * | 2004-04-05 | 2005-04-20 | 上海迪申电子科技有限责任公司 | C-MOS electric charge pump |
| WO2008064464A1 (en) * | 2006-11-30 | 2008-06-05 | Mosaid Technologies Incorporated | Circuit for clamping current in a charge pump |
| CN102347760A (en) * | 2010-07-27 | 2012-02-08 | 中兴通讯股份有限公司 | Charge pump and phase locked loop using charge pump |
| CN103178842A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | A phase-locked loop signal source with ECL phase detector and its generation method |
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