Operational amplifier

Details Operational amplifier Operational amplifier

1981-08-17

1983-11-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330310, H03F 304

Patent

active

044172168

ABSTRACT:
An operational amplifier includes an input stage, an output stage including first and second NPN output transistors and an intermediate stage including first and second emitter follower transistors. In this manner, a .beta..sup.3 current gain is achieved from the amplifier output to the output of the input stage to reduce output loading effects on the input stage. A first capacitor network is coupled between the amplifier output and the output of the input stage to frequency stabilize the amplifier. A second capacitor is coupled between the base terminals of the first and second emitter follower transistors, and a resistor (or diode) is coupled between the emitter of the first emitter follower transistor and the base of the second emitter follower transistor. This network frequency stabilizes the parasitic feedback loop associated with the intermediate stages, the NPN output transistor and the first capacitor network.

REFERENCES:
patent: 4257006 (1971-03-01), Schaumann
The Electronic Engineer "Hybridization" Jun. 1967.

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