Operational amplifier

Details Operational amplifier Operational amplifier

1989-03-20

1990-03-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

379395, H23F 345

Patent

active

049124293

ABSTRACT:
An operational amplifier for producing an output signal representing the voltage differential between two input signals is powered by first, second and third power sources respectively having high, intermediate and low output voltage levels. A voltage buffer circuit, which is connected to the second power source, interconnects a constant current source, which is connected to the first power source, and an amplifier means, which is connected to the third power source, and separates the constant current source from the third power source. A differential amplifier in the amplifier means responds to the two input signals for producing a voltage differential output signal, and an output circuit connected between the second and third power sources receives the voltage differential output signal of the differential amplifier for producing the voltage differential output signal of the operational amplifier.

REFERENCES:
Lyerly, "Ultrahigh Gain Direct-Coupled Differential Amplifier", IBM Technical Disclosure Bulletin, vol. 14, No. 3, Aug. 1971, pp. 964-965.

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