Operational amplifier

Details Operational amplifier Operational amplifier

2006-09-26

2006-09-26

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

C330S255000

Reexamination Certificate

active

07113041

ABSTRACT:
An operational amplifier that decreases idling current, widens a voltage output range, and increases load driving capacity. The operational amplifier includes a first output transistor connected to a high potential power supply. A second output transistor is connected between the first output transistor and a low potential power supply. The first and second output transistors generate an output signal at a node between the first output transistor and the second output transistor. An idling current control circuit controls the collector current of the first output transistor in accordance with the base voltage of the second output transistor to control the idling current of the first and second output transistors.

REFERENCES:
patent: 4431972 (1984-02-01), Ishii et al.
patent: 5467058 (1995-11-01), Fujita
patent: 5689211 (1997-11-01), Embree
U.S. Appl. No. 10/108,341, filed Mar. 29, 2002, Katsuyuki et al.

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