Constant-voltage circuit, semiconductor device using the...

Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...

Reexamination Certificate

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C323S281000

Reexamination Certificate

active

11332163

ABSTRACT:
A constant-voltage circuit includes a first transistor, a first control circuit, and a second control circuit having a second transistor and a differential amplifier. The first transistor controls an output current according to a first control signal output by the first control circuit such that an output voltage is substantially equal to a predetermined voltage. The second control circuit has a response property faster than the first control circuit to a variation of the output voltage, and causes the first transistor to increase the output current for a predetermined time period, regardless of the first control signal, when the output voltage varied to an extent greater than a predetermined output voltage variation value. The second transistor controls an operation of the first transistor according to a second control signal output by the differential amplifier such that a voltage at an inverting input terminal is substantially equal to the bias voltage.

REFERENCES:
patent: 5739681 (1998-04-01), Allman
patent: 2005/0231180 (2005-10-01), Nagata et al.
patent: 2002-274944 (2004-04-01), None

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