CN1567688B - Voltage stabilizer of charge pump - Google Patents
Voltage stabilizer of charge pump Download PDFInfo
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- CN1567688B CN1567688B CN 03149059 CN03149059A CN1567688B CN 1567688 B CN1567688 B CN 1567688B CN 03149059 CN03149059 CN 03149059 CN 03149059 A CN03149059 A CN 03149059A CN 1567688 B CN1567688 B CN 1567688B
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- charge pump
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- pump
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Abstract
The invention is a charge pump voltage stabilizer. The charge pump outputs a voltage according to a clock signal. The voltage stabilizer includes voltage-stabilizing capacitors, one end of each of which coupled with the output end of the charge pump and the other end receiving the reverse clock signal.
Description
Technical field
The present invention is about a kind of stable-pressure device, and particularly relevant for a kind of stable-pressure device that is used for charge pump.
Background technology
Charge pump can be used for improving voltage.For example in erasable flash memory is deposited, general reading as long as low-voltage, 3V for example, writing then needs high voltage, for example 12V.But the supply voltage of general integrated circuit (IC) chip is not high usually, for example is 3V, if need be greater than the operating voltage of 3V the time, for example 12V improves direct voltage with regard to the charge available pump.
Traditional charge pump has the kind of two-phase (2phase), four phases (4phase) or the like.At this charge pump with two-phase is that example describes.Fig. 1 is traditional two-phase charge pump circuit schematic diagram.Two-phase charge pump 100 comprises diode D1, D2, D3, D4, capacitor C 1, C2 and C3.For convenience of description, suppose that diode D1, D2, D3 and D4 are ideal diode, its conducting (turn-on) voltage is 0.The anode of diode D1 is coupled to DC power supply Vdd, and the anode of its negative terminal and diode D2 and an end of capacitor C 1 are coupled to node N1.The other end of capacitor C 1 then receives a clock signal clk.One end of the anode of the negative terminal of diode D2 and diode D3 and capacitor C 2 is coupled to node N2.The other end of capacitor C 2 then receives an inversion clock signal CLK '.One end of the anode of the negative terminal of diode D3 and diode D4 and capacitor C 3 is coupled to node N3.The other end of capacitor C 3 is receive clock signal CLK then.The negative terminal voltage of diode D4 is the pump voltage Vo of output.
Fig. 2 A is the voltage schematic diagram of each node of charge pump.The voltage of DC power supply Vdd is 3V, and the high level of clock signal clk is 3V, and low level is 0V.The voltage V (N1) of node N1 also is 3V when initial.When clock signal clk changes high level into,, make voltage V (N1) rising of node N1 be 6V because the both end voltage of capacitor C 1 is 3V still.In like manner, the voltage V (N1) of node N2 is 9V, and the voltage V (N3) of node N3 is 12V, makes that output voltage V o is 12V.
Fig. 2 B is the schematic diagram of the output voltage of traditional charge pump.After charge pump one-level one-level ground improved voltage, the voltage No of output was 12V.Yet because capacitor C 3 has the effect of discharge, when the clock signal clk that is coupled to capacitor C 3 was reduced to low level, output voltage V o promptly began to descend slightly, and when the clock signal clk of next high level, output voltage V o begins again to rise.The serious words of the difference of output voltage V o between up and down may about 1V, makes the waveform of actual output voltage that ripple be arranged slightly and not ideal enough.
Summary of the invention
In view of this, purpose of the present invention is exactly that a kind of stable-pressure device that couples charge pump is being provided.
According to purpose of the present invention, a kind of stable-pressure device that couples charge pump is proposed, in order to stablize the output end voltage of this charge pump.Charge pump is exported an output voltage according to clock signal work.Stable-pressure device comprises electric capacity of voltage regulation.Electric capacity of voltage regulation one end and electric charge delivery side of pump couple, and the other end receives anti-phase clock signal.
According to purpose of the present invention, a kind of stable-pressure device that couples charge pump is also proposed, this charge pump is exported an output voltage according to one first clock signal, a second clock signal, one the 3rd clock signal and one the 4th clock signal, this device comprises: one first electric capacity of voltage regulation, one end and this electric charge delivery side of pump couple, and the other end receives this anti-phase first clock signal; One second electric capacity of voltage regulation, an end and this electric charge delivery side of pump couple, and the other end receives this anti-phase second clock signal; One the 3rd electric capacity of voltage regulation, an end and this electric charge delivery side of pump couple, and the other end receives the 3rd anti-phase clock signal; And one the 4th electric capacity of voltage regulation, an end and this electric charge delivery side of pump couple, and the other end receives the 4th anti-phase clock signal.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows.
Description of drawings
Fig. 1 is traditional two-phase charge pump circuit schematic diagram.
Fig. 2 A is the voltage schematic diagram of each node of charge pump.
Fig. 2 B is the schematic diagram of the output voltage of charge pump.
Fig. 3 is the stable-pressure device schematic diagram according to a kind of charge pump of one embodiment of the present invention.
Fig. 4 is the charge pump output voltage oscillogram that gets according to stable-pressure device of the present invention.
Fig. 5 is the schematic diagram that the stable-pressure device of charge pump of the present invention is applied to four-phase charge pump.
The reference numerals explanation
100: the two-phase charge pump
500: four-phase charge pump
Embodiment
Charge pump can make output waveform that ripple is arranged slightly owing to utilize electric capacity to realize the effect that direct voltage is boosted inevitably.Design of the present invention promptly is at the electric charge delivery side of pump voltage stabilizing waveform that is coupled, and is opposite with the ripple of the output voltage V o of charge pump, and makes the waveform of output voltage V o comparatively gentle, to promote the quality of power supply.
Fig. 3 is a kind of stable-pressure device schematic diagram that couples charge pump according to one embodiment of the present invention.This routine charge pump is an example with two-phase charge pump 100.Stable-pressure device and two-phase charge pump 100 couple.Charge pump 100 boosts the voltage Vdd that imports according to clock signal clk and is output voltage V o.Stable-pressure device comprises electric capacity of voltage regulation Cs.The end of electric capacity of voltage regulation Cs and the output of charge pump 100 couple, and the other end is receive clock signal CLK ' then.Clock signal clk ' be the inversion signal of clock signal clk.
At this operation principle of charge pump 100 is described earlier.The voltage V (N1) of node N1 also is 3V when initial.When clock signal clk changes into to high level,, make voltage V (N1) rising of node N1 be 6V because the both end voltage of capacitor C 1 is 3V still.In like manner, the voltage V (N1) of node N2 is 9V, and the voltage V (N3) of node N3 is 12V, makes that output voltage V o is 12V.But shown in Fig. 2 B, when output voltage V o was low level at clock signal clk, the cause that can discharge because of capacitor C 3 descended a little, makes output waveform undesirable.Especially when clock signal was upgraded to high level, output voltage V o can suddenly rise, and caused unsettled output.
The present invention promptly by electric capacity of voltage regulation according to the inversion clock signal CLK ' that receives the voltage stabilizing ripple that is coupled in the electric charge delivery side of pump.Because the clock signal of afterbody is anti-phase in inversion clock signal that electric capacity of voltage regulation Cs receives and the charge pump, therefore can be in the deficiency that remedies output voltage V o opportune moment.When output voltage V o began to descend, the voltage stabilizing ripple promptly was coupled to output voltage V o with a positive voltage, to relax the decline of output voltage V o; When output voltage V o began to rise, the voltage stabilizing ripple promptly relaxed the rising of output voltage V o with a negative voltage, therefore can make the waveform of output voltage V o more stable.
Fig. 4 is the charge pump output voltage oscillogram that obtains according to stable-pressure device of the present invention.Dotted line is depicted as the waveform without voltage stabilizing, its high and low differing greatly.Waveform through the output voltage V o of stable-pressure device of the present invention is just comparatively smooth.As seen the effect that truly has regulated output voltage of the present invention.
Electric capacity of voltage regulation Cs of the present invention is through suitably selecting, its capacitance is compared compares very little with the capacitance of the load of charge pump output, therefore behind the capacitance partial pressure of the clock signal clk ' process electric capacity of voltage regulation Cs of electric capacity of voltage regulation Cs reception and load, make the amplitude of voltage stabilizing ripple less, do not influence the D. C. value of output voltage V o haply, and can make output voltage V o more stable.
Fig. 5 is the schematic diagram that the stable-pressure device of charge pump of the present invention is applied to four-phase charge pump.Owing to the charge pump of four phases is worked according to four groups of different clock signal clks 0, CLK1, CLK2 and CLK3, therefore four groups of stable-pressure devices need be arranged, these stable-pressure devices comprise electric capacity of voltage regulation Cs0, Cs1, Cs2 and Cs3 respectively.Electric capacity of voltage regulation Cs0, Cs1, Cs2 and Cs3 receive respectively anti-phase clock signal clk 0 ', CLK1 ', CLK2 ' and CLK3 ', according to the defective of above-mentioned principle compensation output voltage, and make the waveform stabilization of output voltage V o.
The disclosed stable-pressure device of the above embodiment of the present invention has the advantage of the output voltage stabilization that can make charge pump.
In sum; though the present invention with a preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; under the situation that does not break away from the spirit and scope of the present invention; can carry out various changes and modification, so the claim restricted portion that protection scope of the present invention proposed is as the criterion.
Claims (5)
1. stable-pressure device that couples charge pump, in order to stablize the output end voltage of this charge pump, this charge pump is done according to a clock signalman and is exported an output voltage, and this device comprises:
One electric capacity of voltage regulation, an end and this electric charge delivery side of pump couple, and the other end receives this anti-phase clock signal.
2. the stable-pressure device that couples charge pump as claimed in claim 1, wherein this charge pump is exported this output voltage to one load, and the capacitance of this electric capacity of voltage regulation is less than the capacitance of this load.
3. the stable-pressure device that couples charge pump as claimed in claim 1, wherein this charge pump is two-phase.
4. stable-pressure device that couples charge pump, this charge pump is exported an output voltage according to one first clock signal, a second clock signal, one the 3rd clock signal and one the 4th clock signal, and this device comprises:
One first electric capacity of voltage regulation, an end and this electric charge delivery side of pump couple, and the other end receives this anti-phase first clock signal;
One second electric capacity of voltage regulation, an end and this electric charge delivery side of pump couple, and the other end receives this anti-phase second clock signal;
One the 3rd electric capacity of voltage regulation, an end and this electric charge delivery side of pump couple, and the other end receives the 3rd anti-phase clock signal; And
One the 4th electric capacity of voltage regulation, an end and this electric charge delivery side of pump couple, and the other end receives the 4th anti-phase clock signal.
5. the stable-pressure device that couples charge pump as claimed in claim 4, wherein this charge pump is exported this output voltage to one load, and the capacitance of this first, second, third and the 4th electric capacity of voltage regulation is less than the capacitance of this load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03149059 CN1567688B (en) | 2003-06-20 | 2003-06-20 | Voltage stabilizer of charge pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03149059 CN1567688B (en) | 2003-06-20 | 2003-06-20 | Voltage stabilizer of charge pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1567688A CN1567688A (en) | 2005-01-19 |
| CN1567688B true CN1567688B (en) | 2010-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03149059 Expired - Fee Related CN1567688B (en) | 2003-06-20 | 2003-06-20 | Voltage stabilizer of charge pump |
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| Country | Link |
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| CN (1) | CN1567688B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4912121B2 (en) * | 2006-02-23 | 2012-04-11 | 三菱電機株式会社 | Shift register circuit |
| CN101364764B (en) * | 2007-08-06 | 2012-02-08 | 亿而得微电子股份有限公司 | Voltage pump apparatus and operating method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5841703A (en) * | 1996-12-31 | 1998-11-24 | Intel Corporation | Method and apparatus for removal of VT drop in the output diode of charge pumps |
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2003
- 2003-06-20 CN CN 03149059 patent/CN1567688B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5841703A (en) * | 1996-12-31 | 1998-11-24 | Intel Corporation | Method and apparatus for removal of VT drop in the output diode of charge pumps |
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| CN1567688A (en) | 2005-01-19 |
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Granted publication date: 20100421 Termination date: 20190620 |