Simple step-up apparatus including level shift circuits...

Details Simple step-up apparatus including level shift circuits... Simple step-up apparatus including level shift circuits...

2006-02-28

2006-02-28

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

Reexamination Certificate

active

07005912

ABSTRACT:
In a step-up apparatus, a first level shift circuit receives a first clock signal to generate two phase-opposite second clock signals, and a second level shift circuit receives the first clock signal to generate two phase-opposite third clock signals. A charge pump circuit steps up a power supply voltage at a power supply voltage terminal using the second clock signals to generate a positive voltage, and a polarity inverting circuit inverts the positive voltage using the third clock signals to generate a negative voltage whose absolute value is the same as the positive voltage. A high level of the second clock signals is not higher than the positive voltage, and a low level of the second clock signals is not lower than a voltage at a ground terminal. A high level of the third clock signals is not higher than the power supply voltage, and a low level of the third clock signals is not lower than the negative voltage.

REFERENCES:
patent: 6525949 (2003-02-01), Johnson et al.
patent: 6781440 (2004-08-01), Huang
patent: 2002/0130704 (2002-09-01), Myono et al.
patent: 2004/0021504 (2004-02-01), Mihara
patent: 8-28965 (1996-03-01), None

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