Constant voltage circuit

Details Constant voltage circuit Constant voltage circuit

2008-09-04

2011-11-08

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S311000

Reexamination Certificate

active

08054052

ABSTRACT:
A constant voltage circuit converts a voltage input to an input terminal and outputs a predetermined constant voltage from an output terminal. The constant voltage circuit includes an output transistor that outputs an electrical current corresponding to a control signal input thereto to the output terminal, a differential amplifier circuit that outputs the control signal according to a difference between a comparative voltage proportional to the output voltage and a predetermined reference voltage, a current mirror circuit that serves as a load of a pair of input transistors included in the differential amplifier circuit, and a voltage comparator that compares a voltage at a control electrode of a transistor included in the current mirror circuit and a voltage of the control signal. The differential amplifier circuit controls a bias electrical current supplied to the pair of input transistors according to a comparison result of the voltage comparison.

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