Power stage, particularly for an operational amplifier

Details Power stage, particularly for an operational amplifier Power stage, particularly for an operational amplifier

1997-04-24

1999-09-14

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330273, 330274, H03F 326

Patent

active

059528818

ABSTRACT:
A power stage for an operational amplifier includes an output stage, a current source stage, and a gain stage. The output stage is formed by first and second NPN output transistors arranged in a Totem-Pole configuration, each having respective resistors connected between their respective base and emitter terminals. The output transistors are biased in class AB by a quiescent current supplied by the current source stage and are controlled dynamically by the gain stage. The gain stage includes an NPN gain transistor having a collector terminal connected to the base terminal of the first output transistor and an emitter terminal connected to the base terminal of the second output transistor.

REFERENCES:
patent: 3903479 (1975-09-01), Limberg
patent: 4078207 (1978-03-01), Leidich
patent: 4295101 (1981-10-01), Leidich
patent: 5019789 (1991-05-01), Graeme et al.

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