Low drop-out voltage regulator with power supply rejection...

Details Low drop-out voltage regulator with power supply rejection... Low drop-out voltage regulator with power supply rejection...

2005-05-24

2005-05-24

Laxton, Gary L. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S303000

Reexamination Certificate

active

06897637

ABSTRACT:
A low drop-out voltage regulator uses a voltage subtractor circuit36to form a power supply rejection boost circuit. The voltage subtractor36is inserted between the pass element20and the amplifier26of the low drop-out regulator. The voltage regulator circuit includes a pass element20coupled between an input node and an output node; a voltage feedback circuit28and30coupled to the output node Vo; an amplifier26having an input coupled to the voltage feedback circuit; and a voltage subtractor36having a control node coupled to an output of the amplifier26, an output coupled to a control node of the pass element20, and an input coupled to the input node. The boost circuit improves supply noise rejection performance significantly without adding much complexity to the regulator system. The boost circuit is simple and consumes negligible silicon area and power.

REFERENCES:
patent: 3344340 (1967-09-01), Webb
patent: 3538423 (1970-11-01), Goleniewski
patent: 4933625 (1990-06-01), Hayakawa
patent: 5191278 (1993-03-01), Carpenter
patent: 5550461 (1996-08-01), Pouzoullic
patent: 5909109 (1999-06-01), Phillips
patent: 5929617 (1999-07-01), Brokaw
patent: 5955915 (1999-09-01), Edwards
patent: 6707340 (2004-03-01), Gough

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