Charge pump circuit

Details Charge pump circuit Charge pump circuit

2008-01-29

2008-01-29

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S537000, C363S060000

Reexamination Certificate

active

07323926

ABSTRACT:
A charge pump circuit comprises a first pump stage, including a first sub-pump coupled to a first pre-charge MOSFET transistor, wherein the first sub-pump is used to pump down a gate of the first pre-charge MOSFET transistor to thereby increase the pre-charge efficiency of the first pre-charge MOSFET transistor. The higher efficiency the pre-charge MOSFET is, the lower the gate level of a pass transistor is. Thus, the charge sharing efficiency becomes better, and the body effect will be eliminated. The following pump stage is the same as the first pump stage. In addition, this pre-charging is implemented by PMOSFET only; therefore, only a single well is needed and then a small layout area can be achieved. Consequently, a high efficiency negative pump can be obtained.

REFERENCES:
patent: 5754476 (1998-05-01), Caser et al.
patent: 6064251 (2000-05-01), Park
patent: 6255896 (2001-07-01), Li et al.
patent: 6373324 (2002-04-01), Li et al.
patent: 6614699 (2003-09-01), Tanzawa
patent: 6621326 (2003-09-01), Le
patent: 6912159 (2005-06-01), Osawa et al.

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