CN103490617A - Negative voltage charge pump circuit - Google Patents
Negative voltage charge pump circuit Download PDFInfo
- Publication number
- CN103490617A CN103490617A CN201310381501.4A CN201310381501A CN103490617A CN 103490617 A CN103490617 A CN 103490617A CN 201310381501 A CN201310381501 A CN 201310381501A CN 103490617 A CN103490617 A CN 103490617A
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- Prior art keywords
- switch
- charge pump
- negative voltage
- capacitor
- pump circuit
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Abstract
The invention discloses a negative voltage charge pump circuit which is provided with a first switch and a second switch, wherein the first switch and the second switch are connected in series. The input end of the first switch is grounded, a sampling clock CK is connected between the first switch and the second switch in parallel, the output end of the sampling clock CK is connected with a capacitor C1 in series, the input end and the output end of the capacitor C1 are respectively connected with a grounded capacitor in parallel, and the output end of the second switch is connected with a grounded filter capacitor C2 in parallel. The negative voltage charge pump circuit can generate negative voltages, the output voltages are stable negative voltages, and the charge pump circuit can be further set according to the capacity of loads, the frequency of the sampling clock CK and the size of the capacitor C1.
Description
Technical field
The present invention relates to a kind of charge pump circuit, relate in particular to a kind of negative voltage charge pump circuit.
Background technology
Charge pump refers to a kind of switch and capacitor combination circuit, and it can realize between input and output producing a relatively-stationary voltage difference.This voltage difference is that capacitor combination inside ceaselessly discharges and recharges realization by switching tube.Existing technology mainly concentrates in the positive voltage charge pump, and negative voltage charge pump does not also adopt.
Summary of the invention
Technical problem to be solved by this invention is that a kind of circuit of the negative voltage charge pump for negative voltage charge pump is provided.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions: a kind of negative voltage charge pump circuit, switch one and switch two with mutual series connection, described switch one input end grounding, sampling clock CK in parallel between switch one and switch, be in series with capacitor C 1 on the output of described sampling clock CK, on described capacitor C 1 input and output, the electric capacity of a ground connection in each parallel connection.
Preferably, be parallel with the filter capacitor C2 of ground connection on switch two outputs.
Compared with prior art, usefulness of the present invention is: this negative voltage charge pump circuit can be realized the generation of negative voltage, the voltage of output is a more stable negative voltage, and can set this charge pump circuit according to the size of load, frequency and capacitor C 1 size of sampling clock CK.
the accompanying drawing explanation:
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is a kind of negative voltage charge pump electrical block diagram of the present invention.
In figure: 1, switch one; 2, switch two; 3, electric capacity.
embodiment:
Below in conjunction with the drawings and the specific embodiments, describe the present invention:
A kind of negative voltage charge pump circuit shown in Fig. 1, switch 1 and switch 22 with mutual series connection, described switch one 1 input end groundings, be parallel with the capacitor C 2 of ground connection on switch 22 outputs, sampling clock CK in parallel between switch 1 and switch 22, be in series with capacitor C 1 on the output of described sampling clock CK, on described capacitor C 1 input and output, the electric capacity 3 of a ground connection in each parallel connection.
Concrete, when sampling clock CK frequency ratio is low, switch 1 cuts out, and now the A point is that 0, B point is high, and capacitor C 1 is filled the electric charge of C1 * Vdd with; When sampling clock CK frequency, by low when turning high-tension, switch 1 is opened, and switch 22 cuts out, and the A point is received in load, and the B point transfers 0 to by height.Because the voltage at capacitor C 1 two ends can not sharply change moment, (variation need to discharge and recharge capacitor C 1), cause the A point to be realized thus the generation of negative voltage by 0 original transfer to-Vdd..Along with the electric discharge of output loading, the A point is withdrawn into and is approached 0 from-Vdd gradually, and at this moment sampling clock CK frequency turns low by height, cuts off the link of A point and load, restarts the process of charging, discharging.When a plurality of such half circuits are parallel to together, and their clock staggers, and adds filter capacitor C2, and output OUT is a more stable negative voltage.Specifically need how many half circuits, filter capacitor C2 needs much, will be according to decisions such as the size of load, sampling clock CK frequency, capacitor C 1 sizes.
It is emphasized that: above is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all still belong in the scope of technical solution of the present invention.
Claims (2)
1. a negative voltage charge pump circuit, it is characterized in that: switch one (1) and switch two (2) with mutual series connection, described switch one (1) input end grounding, sampling clock (CK) in parallel between switch one (1) and switch two (2), be in series with electric capacity (C1) on the output of described sampling clock (CK), on described electric capacity (C1) input and output, the electric capacity (3) of a ground connection in each parallel connection.
2. negative voltage charge pump circuit according to claim 1, is characterized in that: the filter capacitor (C2) that is parallel with ground connection on switch two (2) outputs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310381501.4A CN103490617A (en) | 2013-08-29 | 2013-08-29 | Negative voltage charge pump circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310381501.4A CN103490617A (en) | 2013-08-29 | 2013-08-29 | Negative voltage charge pump circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103490617A true CN103490617A (en) | 2014-01-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310381501.4A Pending CN103490617A (en) | 2013-08-29 | 2013-08-29 | Negative voltage charge pump circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103490617A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482904A (en) * | 2017-07-17 | 2017-12-15 | 上海华虹宏力半导体制造有限公司 | Negative pressure charge pump |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101309048A (en) * | 2007-05-17 | 2008-11-19 | 比亚迪股份有限公司 | Charge pump apparatus and electric power circuit |
| KR20100107198A (en) * | 2009-03-25 | 2010-10-05 | 넥스트랩주식회사 | Charge pump circuit |
| CN101931375A (en) * | 2010-08-26 | 2010-12-29 | 成都芯源系统有限公司 | Amplifying circuit with high power supply rejection ratio |
| CN102957315A (en) * | 2011-08-19 | 2013-03-06 | 深圳市特纳电子有限公司 | Boost integrated circuit for tuner |
| CN203406781U (en) * | 2013-08-29 | 2014-01-22 | 苏州苏尔达信息科技有限公司 | Negative-voltage charge pump circuit |
-
2013
- 2013-08-29 CN CN201310381501.4A patent/CN103490617A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101309048A (en) * | 2007-05-17 | 2008-11-19 | 比亚迪股份有限公司 | Charge pump apparatus and electric power circuit |
| KR20100107198A (en) * | 2009-03-25 | 2010-10-05 | 넥스트랩주식회사 | Charge pump circuit |
| CN101931375A (en) * | 2010-08-26 | 2010-12-29 | 成都芯源系统有限公司 | Amplifying circuit with high power supply rejection ratio |
| CN102957315A (en) * | 2011-08-19 | 2013-03-06 | 深圳市特纳电子有限公司 | Boost integrated circuit for tuner |
| CN203406781U (en) * | 2013-08-29 | 2014-01-22 | 苏州苏尔达信息科技有限公司 | Negative-voltage charge pump circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482904A (en) * | 2017-07-17 | 2017-12-15 | 上海华虹宏力半导体制造有限公司 | Negative pressure charge pump |
| CN107482904B (en) * | 2017-07-17 | 2019-08-13 | 上海华虹宏力半导体制造有限公司 | Negative pressure charge pump |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140101 |