CN101414784A - Charge pump - Google Patents
Charge pump Download PDFInfo
- Publication number
- CN101414784A CN101414784A CNA2007101802620A CN200710180262A CN101414784A CN 101414784 A CN101414784 A CN 101414784A CN A2007101802620 A CNA2007101802620 A CN A2007101802620A CN 200710180262 A CN200710180262 A CN 200710180262A CN 101414784 A CN101414784 A CN 101414784A
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- current
- current source
- charge pump
- electric current
- control
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Abstract
The invention relates to a charge pump which comprises an adjustable current source which provides an adjustable current, a second current source which provides a second current, a first switch unit and a second switch unit which are coupled between the adjustable current source and the second current source and a control circuit which is used for controlling the current volume of the adjustable current source to ensure that the current of the adjustable current is equal to the second current essentially. Therefore, even if the current of the adjustable current source is not matched with the current of the second current source, the control circuit also can be used for ensuring that the current of the adjustable current is equal to the second current essentially.
Description
Technical field
The present invention relates to have the charge pump of real-time current calibration, particularly relate to and utilize the unmatched charge pump of adjustable current source offset current.
Background technology
Fig. 1 for existing phase-locked loop (Phase lock loop, PLL) or delay-locked loop (DelayLocked loop, an embodiment of charge pump DLL) (charge pump) circuit.As shown in the drawing, this charge pump 10 has comprised two current sources (current source) 11,12, by the switch 131,132,133,134 and an operational amplifier (OP) 14 of control signal UP, DN control.(mismatch) can not cause voltage-controlled oscillator (VCO) (Voltage controlledOscillator when two current sources 11,12 mate up and down, VCO) disturbance of control voltage, and then cause the phase noise (phase noise) of output signal or shake (jitter) to become big.
Fig. 2 is for having phase-locked loop (Phase lock loop, another embodiment of charge pump PLL) (charge pump) circuit now.As shown in the drawing, this charge pump 20 comprised two digital analog converters (DAC) 21,22, by switch 131,132 133,134 and an operational amplifier (OP) 14 of control signal UP, DN control.But this kind method has following shortcoming:
One, because the restriction of the resolution (resolution) of DAC.This two electric current I after calibration is finished
UP, I
DNStill there is slight error.
Two, the method must be calibrated by off-line (off line).And after calibration is finished, two electric current I
UP, I
DNBecause of certain reason (as temperature change) when not matching, then can reduce the effect of calibration.
Another existing charge pump is exposed in the US patent the 6th, 326, No. 852.Should have complicated circuit and higher power consumption by existing charge pump.
Summary of the invention
Because the problems referred to above, one of purpose of the present invention is to propose a kind of charge pump with correcting current, to overcome the problems referred to above.
One of purpose of the present invention is to propose a kind of charge pump with correcting current, can adjust size of current in real time and make it coupling.
One of purpose of the present invention is to propose a kind of charge pump with correcting current, changes with the electric current that variation was caused that overcomes because of ambient temperature.
For achieving the above object, charge pump of the present invention comprises: an adjustable current source comprises one first current source and an impedance unit and an adjustable current is provided; One second current source provides one second electric current; One first switch element and a second switch unit are coupled between this adjustable current source and this second current source; And a control circuit, in order to control the magnitude of current of this adjustable current source, make the electric current of this adjustable current equal this second electric current in fact.
Therefore, even the electric current of the electric current of first current source and second current source does not match, also can make the electric current of this adjustable current equal this second electric current in fact by control circuit.
Description of drawings
Fig. 1 is an embodiment of the charge pump circuit of existing phase-locked loop.
Fig. 2 is another embodiment of the charge pump circuit of existing phase-locked loop.
Fig. 3 is the circuit diagram of charge pump of the present invention.
Fig. 4 A is first embodiment of charge pump of the present invention.
Fig. 4 B is second embodiment of charge pump of the present invention.
Fig. 4 C is the 3rd embodiment of charge pump of the present invention.
Fig. 4 D is another embodiment of the current source of charge pump of the present invention.
Fig. 5 is the 4th embodiment of charge pump of the present invention.
Fig. 6 is the 5th embodiment of charge pump of the present invention.
Fig. 7 is an embodiment of edge of the present invention comparator.
The reference numeral explanation
10,20 charge pumps
11,12 current sources
131,132,133,134 switches
14,43 operational amplifiers
21,22 digital analog converters
30,40,40 ', 40 ", the charge pump of 50,60 real-time currents calibration
31,32,61,62,611 current sources
41,41 ', 411,412,412 ', 42,421,422 current sources
43 control circuits
51,52 switch modules
53 OP amplifiers
54 low pass filters
612 adjustable current sources
62 control circuits
63 edge comparators
64 smoothing unit
C1, C2 capacitor
R
UP, R
DN, R2 resistance
Embodiment
Fig. 3 is the circuit diagram of charge pump of the present invention.As shown in the drawing, charge pump 30 with real-time current calibration comprised two current sources 31,32, by the switch 131,132 of control signal UP control, by the switch 133,134 and a capacitor C1 of control signal DN control.One embodiment, this first current source 31 comprise one first current source 311 and an impedance unit Z
UPAnother embodiment, this second current source 32 comprise one second current source 321 and an impedance unit Z
DNFirst current source 31 is connected in first end of switch 131,132; And second current source 32 is connected in switch 133,134 first ends.Second end of switch 131 is connected with second end of switch 133, and forms one first current path, and second end of switch 132 is connected with second end of switch 134, and forms one second current path.Capacitor C1 is connected in first current path and uses via this first current path and discharge and recharge, and uses an output current I is provided and current output terminal is connected in second current path
Out
When PLL locked, two current sources 31,32 of charge pump 30 can periodically be switched to first current path or second current path simultaneously by switch 131,132,133,134.Formula (1) can derive the change in voltage of capacitor C 1.
And if electric current I
UP, I
DNExist when not matching, then have the electric current inflow or flow out capacitor C 1, and cause the change of VC.Therefore, if system by adjusting impedance unit Z
UPAnd/or Z
DNWhen making VC keep a fixed voltage, just can offset electric current I
UPWith I
DNDo not match.Certain two impedance unit Z
UP, Z
DNIn one of them can omit.Certain two current sources 31,32 need not be all adjustable.This impedance unit can existingly can constitute impedance unit and implements by a variable resistor, a resistor network, the series connection of transistor AND gate resistance or by other.
Fig. 4 A has first embodiment of charge pump of the mechanism of back coupling for the present invention.As shown in the drawing, charge pump 40 has comprised an adjustable current source 41 provides electric current I
UP, one second current source 42 provides electric current I
DN, by the switch 131,132 of control signal UP control, by switch 133,134, a capacitor C1 and a control unit 43 of control signal DN control.This control unit 43 can be an operational amplifier 431.Current source 41 comprises one first current source 411 and an impedance unit 412.Impedance unit 412 receives the output signal of this operational amplifier 431.So, come control flows to cross the electric current of impedance unit 412 by the output voltage of operational amplifier 431.The positive input terminal of operational amplifier 431 is connected in capacitor C1, negative input end is connected in a voltage Vdc and output is connected in impedance unit 412.
Work as electric current I
UP, I
DNWhen not matching, the voltage VC of capacitor C1 can change.431 of operational amplifiers can come control flows to cross the electric current of impedance unit 412 according to voltage VC at any time, allow electric current I
UP, I
DNCoupling.For example, work as electric current I
UPLess than electric current I
DNThe time, capacitor C1 can discharge, and voltage VC is reduced.At this moment, the output voltage of operational amplifier 431 also can with reduction, make the electric current flow through impedance unit 412 increase.Vice versa.So, but charge pump real time calibration electric current I of the present invention
UP, I
DNSize make it the coupling.
Fig. 4 B is second embodiment of charge pump of the present invention.The charge pump 40 ' of this embodiment is almost completely identical with the framework of the charge pump 40 of first embodiment, and its difference only is that the negative input end of the operational amplifier 431 of charge pump 40 ' is directly connected to second current path.That is, utilize the output voltage V of charge pump 40 '
OutReplace voltage V
Dc
Though the operational amplifier 431 of the charge pump 40 of first embodiment and the charge pump 40 ' of second embodiment all is first adjustable current source 41 that is used for adjusting the top, 41 ' electric current, but if second current source also uses adjustable current source, then operational amplifier 431 also can be used to adjust the adjustable current source of below.See also the 3rd embodiment of Fig. 4 C charge pump of the present invention, in this no longer repeat specification.When another embodiment was adjustable current source for current source 41 and 42, then operational amplifier 431 also can be adjusted the adjustable current source of top and the adjustable current source of below simultaneously.
Fig. 4 D is another embodiment of the adjustable current source of charge pump of the present invention.This adjustable current source 41 ' comprises two transistors 411,412 ' and one resistance R 412 ', that is is connected with resistance R 412 ' by transistor 412 ' and to replace impedance unit 412.Therefore, transistor 412 ' will be very flexible with the design of resistance R 412 '.
Fig. 5 is the 4th embodiment of charge pump of the present invention.As shown in the drawing, this charge pump 50 comprises two current sources, two switch modules 51,52 and a capacitor C 1.Two transistors of the output stage (output stage) of two shared OP amplifiers 53 of current source are realized.One embodiment, even can realize do not match correction (current mismatch correction) and the circuit of charge sharing removal of electric current together.One preferred embodiment, for the problem of stability and prevent that electric current OP amplifier 53 when switch switches from can add some low pass filters 54 for opening loop (open loop), for example resistance R 2 and capacitor C 2 networks, make 53 inputs of OP amplifier fixing, and then make Control current I
UPAnd I
DNFixing.
Fig. 6 is the 5th embodiment of charge pump of the present invention.As shown in the drawing, the charge pump 60 with real-time current calibration has comprised two current sources 61,62 provides electric current I
UP, I
DN, by the switch 131,132 of control signal UP control, by switch 133,134, a control circuit 62 of control signal DN control.Current source 61 comprises one first current source 611 and an adjustable current source 612, and wherein first current source 611 is a constant current source.Electric current I
UPUtilize switch 131,132 to switch to first current path and second current path, and electric current I
DNUtilize switch 133,134 to switch to first current path and second current path.
This control circuit 62 comprises an edge comparator 63 and a smoothing unit 64.Edge comparator 63 receives control signal UP and DN, and produces an edge signal behind the edge of comparison control signal UP and DN.Edge comparator 63 can be implemented with phase detectors (Phase detector) or phase-frequency detector (PFD), or implements with simple latch cicuit (Simple Latch Unit), and as shown in Figure 7, it is described in detail in this omission.And behind smoothing unit 64 these margin signals of reception, produce a fine setting control signal and control second current source 612.Smoothing unit 64 can be implemented with the RC low pass filter of passive type or active integrator.
After the PLL locking, if the leading control signal DN of control signal UP, then margin signal is a high potential, and finely tune control signal and can slowly promote this moment, makes electric current I
UPReduce; Otherwise if control signal UP falls behind control signal DN, then margin signal is an electronegative potential, finely tunes control signal this moment and can slowly reduce, and makes electric current I
UPIncrease.
Certainly, the embodiment of Fig. 6 utilizes the fine setting control signal to come the adjustable current source 612 in Control current source 61, also current source 62 can be implemented with the framework of current source 61, and be utilized the fine setting control signal to come the adjustable current source in Control current source 62.
So even because the variation of ambient temperature is when causing the electric current of current source to change, charge pump of the present invention also can be adjusted electric current I at any time
UP, I
DNSize make it the coupling.
Though more than with embodiment the present invention is described, therefore do not limit scope of the present invention, only otherwise break away from main idea of the present invention, those skilled in the art can carry out various distortion or change.
Claims (16)
1. charge pump comprises:
One first current source provides one first electric current;
One second current source, so that one second electric current to be provided, wherein this second electric current equals this first electric current in fact in order to foundation one current controling signal;
One first current path comprises:
One first switch is between a first node and this second current source; And
One second switch is between this first node and this first current source;
One second current path comprises:
One the 3rd switch is between a Section Point and this second current source; And
One the 4th switch is between this Section Point and this first current source; And
One control circuit receives and the relatively voltage and a reference voltage of this first node, to export this current controling signal.
2. charge pump as claimed in claim 1, this second current source comprises:
One fixed current source provides a fixed current; And
One adjustable current source, in order to according to this current controling signal to provide one to adjust electric current.
3. charge pump as claimed in claim 2, this adjustable current source comprises:
One the first transistor; And
One resistance is connected with this first transistor.
4. charge pump as claimed in claim 3, this resistance according to this current controling signal to change its resistance.
5. lotus pump as claimed in claim 1, wherein this reference voltage is a fixed voltage or the voltage of this Section Point.
6. lotus pump as claimed in claim 1, wherein this second current source is an adjustable current source, comprises one first impedance unit and one first current source.
7. lotus pump as claimed in claim 6, wherein this first impedance unit is one of them of following impedance unit: a resistor network, a variable resistor, the series connection of a transistor AND gate one resistance are formed and a transistor.
8. charge pump as claimed in claim 1, wherein aforementioned control circuit is an operational amplifier, two inputs of this operational amplifier receive the voltage of this first node and this reference voltage and output respectively in order to export this current controling signal.
9. charge pump as claimed in claim 1 also comprises one second impedance unit, and this second impedance unit is in parallel with this first current source.
10. charge pump as claimed in claim 1, wherein this first is respectively a first transistor and a transistor seconds in an output stage with this second current source.
11. charge pump as claimed in claim 10, wherein this output stage is positioned at this control circuit.
12. a charge pump comprises:
One first current source provides one first electric current;
One second current source provides one second electric current;
One first switch element is connected to one first current path or one second current path by the control of one first control signal with this first current source;
One second switch unit is connected to this first current path or this second current path by the control of one second control signal with this second current source; And
One control circuit, receive this first with this second control signal, and first control the magnitude of current of this first electric current with this second control signal according to this, make this first electric current equal this second electric current in fact.
13. charge pump as claimed in claim 12, wherein this control circuit comprises:
One edge comparator receives this first and second control signal, and relatively this first control signal and second control signal to produce an edge signal; And
One smoothing unit receives and produces a control signal behind this margin signal, and utilizes this control signal to control this first electric current of this first current source.
14. charge pump as claimed in claim 13, wherein this smoothing unit is a low pass filter or is a RC circuit.
15. charge pump as claimed in claim 13, wherein this edge comparator is phase detectors or is a frequency plot comparator or is a latch cicuit.
16. charge pump as claimed in claim 12 is positioned at a phase-locked loop or is positioned at a delay-locked loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101802620A CN101414784A (en) | 2007-10-16 | 2007-10-16 | Charge pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101802620A CN101414784A (en) | 2007-10-16 | 2007-10-16 | Charge pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101414784A true CN101414784A (en) | 2009-04-22 |
Family
ID=40595155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101802620A Pending CN101414784A (en) | 2007-10-16 | 2007-10-16 | Charge pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101414784A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674077A (en) * | 2009-09-22 | 2010-03-17 | 上海宏力半导体制造有限公司 | Charge pump |
| CN102097933A (en) * | 2009-12-14 | 2011-06-15 | 瑞昱半导体股份有限公司 | Charge pump and method thereof |
| CN102122883A (en) * | 2010-01-08 | 2011-07-13 | 无锡百阳科技有限公司 | Charge pump |
| CN102158226A (en) * | 2010-12-31 | 2011-08-17 | 钰创科技股份有限公司 | Voltage holding circuit |
| CN102511128A (en) * | 2009-09-22 | 2012-06-20 | 高通股份有限公司 | System and method for power calibrating a pulse generator |
| CN103107806A (en) * | 2011-11-14 | 2013-05-15 | 孙茂友 | Low noise spectrum Sigma-Delta decimal-N phase-locked loop |
| TWI396955B (en) * | 2009-10-13 | 2013-05-21 | Nanya Technology Corp | Pump system can dynamically increase its current capability and method thereof |
| CN103166455A (en) * | 2011-12-14 | 2013-06-19 | 国民技术股份有限公司 | Charge pump and phase-locked loop circuit |
| CN102035370B (en) * | 2009-09-28 | 2013-10-09 | 登丰微电子股份有限公司 | Charge pump circuit with current detection function and circuit unit thereof |
| CN103166455B (en) * | 2011-12-14 | 2016-12-14 | 国民技术股份有限公司 | Electric charge pump and phase-locked loop circuit |
| CN109510620A (en) * | 2018-11-08 | 2019-03-22 | 成都振芯科技股份有限公司 | Reduce the high gain charge and frequency synthesizer of frequency synthesizer phase noise |
| WO2019169607A1 (en) * | 2018-03-08 | 2019-09-12 | 华为技术有限公司 | Charge pump circuit for suppressing current mismatch and control method therefor, and phase locked loop circuit |
| CN111224539A (en) * | 2018-11-27 | 2020-06-02 | 恩智浦有限公司 | Charge pump and method for operating a charge pump |
-
2007
- 2007-10-16 CN CNA2007101802620A patent/CN101414784A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102511128A (en) * | 2009-09-22 | 2012-06-20 | 高通股份有限公司 | System and method for power calibrating a pulse generator |
| CN102511128B (en) * | 2009-09-22 | 2014-08-13 | 高通股份有限公司 | System, method, earphone and device for power calibrating a pulse generator |
| CN101674077A (en) * | 2009-09-22 | 2010-03-17 | 上海宏力半导体制造有限公司 | Charge pump |
| CN102035370B (en) * | 2009-09-28 | 2013-10-09 | 登丰微电子股份有限公司 | Charge pump circuit with current detection function and circuit unit thereof |
| TWI396955B (en) * | 2009-10-13 | 2013-05-21 | Nanya Technology Corp | Pump system can dynamically increase its current capability and method thereof |
| CN102097933A (en) * | 2009-12-14 | 2011-06-15 | 瑞昱半导体股份有限公司 | Charge pump and method thereof |
| CN102097933B (en) * | 2009-12-14 | 2013-11-06 | 瑞昱半导体股份有限公司 | Charge pump and method thereof |
| CN102122883A (en) * | 2010-01-08 | 2011-07-13 | 无锡百阳科技有限公司 | Charge pump |
| CN102158226A (en) * | 2010-12-31 | 2011-08-17 | 钰创科技股份有限公司 | Voltage holding circuit |
| CN103107806A (en) * | 2011-11-14 | 2013-05-15 | 孙茂友 | Low noise spectrum Sigma-Delta decimal-N phase-locked loop |
| CN103166455A (en) * | 2011-12-14 | 2013-06-19 | 国民技术股份有限公司 | Charge pump and phase-locked loop circuit |
| CN103166455B (en) * | 2011-12-14 | 2016-12-14 | 国民技术股份有限公司 | Electric charge pump and phase-locked loop circuit |
| WO2019169607A1 (en) * | 2018-03-08 | 2019-09-12 | 华为技术有限公司 | Charge pump circuit for suppressing current mismatch and control method therefor, and phase locked loop circuit |
| CN111819777A (en) * | 2018-03-08 | 2020-10-23 | 华为技术有限公司 | Charge pump circuit for inhibiting current mismatch, control method thereof and phase-locked loop circuit |
| CN109510620A (en) * | 2018-11-08 | 2019-03-22 | 成都振芯科技股份有限公司 | Reduce the high gain charge and frequency synthesizer of frequency synthesizer phase noise |
| CN111224539A (en) * | 2018-11-27 | 2020-06-02 | 恩智浦有限公司 | Charge pump and method for operating a charge pump |
| CN111224539B (en) * | 2018-11-27 | 2023-12-19 | 恩智浦有限公司 | Charge pump and method for operating a charge pump |
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Open date: 20090422 |