Series regulator and differential amplifier circuit thereof

Details Series regulator and differential amplifier circuit thereof Series regulator and differential amplifier circuit thereof

2006-03-20

2009-02-17

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S316000

Reexamination Certificate

active

07492137

ABSTRACT:
A series regulator for supplying a stable output voltage to a load has a differential amplifier circuit and an output stage. The output stage has an output control transistor that supplies the output voltage in accordance with a control signal, and a voltage divider circuit that divides the output voltage and outputs the divided voltage. The differential input stage includes a differential pair (source-coupled pair) of two NMOS transistors, an NMOS transistor, and a current mirror circuit formed by PMOS transistors. The differential input stage detects a differential voltage between a reference voltage and the divided voltage output from the voltage divider circuit. The differential amplifier circuit also has an amplification stage including a PMOS transistor that has a resistor connected between its gate and drain and that has its drain connected to a node, and an NMOS transistor that supplies a current proportional to a constant current to the PMOS transistor. The series regulator/differential amplifier circuit allows both low output resistance and sufficient DC gain without increasing bias current.

REFERENCES:
patent: 4282477 (1981-08-01), Ahmed
patent: 6897715 (2005-05-01), Barber et al.
patent: 7068018 (2006-06-01), Kanakubo
patent: 2002-258954 (2002-09-01), None

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