Highly reliable and zero static current start-up circuits

Details Highly reliable and zero static current start-up circuits Highly reliable and zero static current start-up circuits

2008-01-22

2008-01-22

Richards, N. Drew (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C323S313000

Reexamination Certificate

active

07321256

ABSTRACT:
A bandgap reference voltage circuit includes a bandgap circuit, a start-up circuit, and a recovery circuit. Upon device power-on, the start-up circuit provides a start-up current to initialize the bandgap circuit to a valid state, during which the bandgap circuit generates a substantially constant bandgap reference voltage. Once the bandgap circuit is in the valid state, the start-up circuit turns itself off. If the bandgap reference voltage falls to a level that causes the bandgap circuit to enter an invalid state, the recovery circuit turns on and provides a recovery current to the bandgap circuit that returns the bandgap circuit to the valid state, after which the recovery circuit turns itself off.

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patent: 2004/0000944 (2004-01-01), Cho
patent: 2005/0231270 (2005-10-01), Washburn

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