Operational amplifier circuit having stable operating point

Details Operational amplifier circuit having stable operating point Operational amplifier circuit having stable operating point

1988-11-23

1990-03-27

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, 330264, H03F 345, H03F 326

Patent

active

049124250

ABSTRACT:
An operational amplifier circuit comprises a differential amplifier circuit for generating an output voltage in response to the difference in potential between two input signals, a level shift circuit for shifting the output voltage of the differential amplifier circuit, a push-pull output circuit which operates in response to the output voltages of the differential amplifier circuit and the level shift circuit, and a bias circuit for generating a bias voltage in response to a power supply voltage to control the level shift circuit. The output voltage of the level shift circuit is not affected by fluctuations of the power supply voltage.

REFERENCES:
patent: 4284957 (1981-08-01), Haque
patent: 4656435 (1987-04-01), Czarniak et al.

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