Output stage for an operational amplifier

Details Output stage for an operational amplifier Output stage for an operational amplifier

1984-03-19

1985-08-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330275, 330294, 330298, H03F 330

Patent

active

045381160

ABSTRACT:
An operational amplifier includes an input stage, an output stage including first, second and third NPN output transistors, and an intermediate stage. The first NPN output transistor sources load current to an output terminal while the second and third output transistors sink load current therefrom. The output of the intermediate stage is coupled to the base of the third NPN transistor and, via a resistor, to the base of the second NPN transistor. A first Miller capacitor is coupled between the input of the intermediate stage and the amplifier's output terminal, and a second Miller capacitor is coupled between the base of the second NPN transistor and the output terminal.

REFERENCES:
patent: 3660773 (1972-05-01), Free
patent: 4403200 (1983-09-01), Davis

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