Fast-disabled voltage regulator circuit with low-noise...

Details Fast-disabled voltage regulator circuit with low-noise... Fast-disabled voltage regulator circuit with low-noise...

2006-09-19

2006-09-19

Sterrett, Jeffrey (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

Reexamination Certificate

active

07109690

ABSTRACT:
A low-noise voltage regulator circuit with quick disablement is disclosed. The voltage regulator circuit includes an amplifier for outputting a driving voltage according to a reference voltage, a feedback voltage on a feedback node, and an enable signal; an output transistor coupled among the amplifier, an output node, and a first voltage source for outputting an output voltage at the output node; a first discharge transistor coupled among the enable signal, the output node, and the feedback node; and a second discharge transistor coupled among the enable signal, the feedback node, and a second voltage source; wherein when the enable signal disables the amplifier, the enable signal turns on the first discharge transistor and the second discharge transistor such that the output voltage is quickly pulled down to close a level provided by the second voltage source.

REFERENCES:
patent: 4962349 (1990-10-01), Albach et al.
patent: 5015921 (1991-05-01), Carlson et al.
patent: 5528132 (1996-06-01), Doluca
patent: 5861737 (1999-01-01), Goerke et al.
patent: 6177785 (2001-01-01), Lee
patent: 6362609 (2002-03-01), Gailhard
patent: 6414537 (2002-07-01), Smith

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