Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-05-29
2007-05-29
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S540000, C327S541000, C327S542000, C327S543000, C323S313000, C323S326000
Reexamination Certificate
active
11065201
ABSTRACT:
A voltage regulator has a reference voltage generator that outputs a reference voltage based on first and second electrical source voltages, an output circuit which generates a predetermined direct-current voltage based on the reference voltage and generates a comparison voltage lower than the predetermined direct-current voltage, and a differential amplifier coupled between the reference voltage generator and the output circuit. The differential amplifier provides a control voltage to the output circuit responsive to a difference between the reference and comparison voltages. The voltage regulator has a voltage adjustment circuit that adjusts the reference voltage responsive to a variation in the first electrical source voltage. The differential amplifier may include a constant-current circuit and an operation current generating circuit. The voltage regulator may include a detecting circuit that detects a variation in the first electrical source voltage and controls the operation current generating circuit responsive thereto.
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Callahan Timothy P.
Nguyen Hiep
Oki Electric Industry Co. Ltd.
Volentine & Whitt P.L.L.C.
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