Reference voltage generating circuit having an integrator

Details Reference voltage generating circuit having an integrator Reference voltage generating circuit having an integrator

1997-09-29

1999-03-23

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327538, 327540, G05F 110

Patent

active

058865659

ABSTRACT:
A reference voltage generating circuit is provided with a reference voltage output terminal, a voltage dividing circuit that divides a voltage supplied from a power source, and an integrating circuit having a given time constant, for integrating a voltage of the divided voltage output terminal of the voltage dividing circuit and generating a reference voltage as a result of integration to the reference voltage output terminal. A high-speed charging circuit is connected to the reference voltage output terminal, for charging the integrating circuit at a high speed when the power source is turned on, to elevate a voltage of the reference voltage output terminal at a speed higher than a speed determined by the time constant of the integrating circuit. A comparator circuit compares the voltage of the divided voltage output terminal with the voltage of the reference voltage output terminal, and turns off the high-speed charging circuit when a difference between the voltage of the divided voltage output terminal and the voltage of the reference voltage output terminal becomes equal to or smaller than a predetermined level.

REFERENCES:
patent: 4264785 (1981-04-01), Jacobson
patent: 5631598 (1997-05-01), Miranda et al.
patent: 5731731 (1998-03-01), Wilcox et al.

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