Push-pull output stage for amplifier in integrated circuit form

Details Push-pull output stage for amplifier in integrated circuit form Push-pull output stage for amplifier in integrated circuit form

1993-03-03

1994-12-27

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330288, H03F 326

Patent

active

053769007

ABSTRACT:
A push-pull output stage for electronic integrated circuits includes two NPN transistors (Q1, Q2) connected in series between two supply terminals. The output (S) is the junction point of the transistors. A third NPN transistor (Q3) has its base and its collector connected respectively to the base and to the collector of Q1. Two current flow arms (R1, Q4 and R2, Q5) are formed, one to establish a current depending on the potential of the emitter of Q3 and the other to establish a current depending on the potential of the emitter of Q1. The arms are mounted in a current mirror arrangement, the second arm tending to copy the current of the first arm; the current mirror generating a current output (S2) representing a difference between the current set up in the second arm and the current copied from the first arm. This current output is used to control the conduction of the second transistor (Q2). Thus, there is obtained an output stage using exclusively NPN transistors and having, at the same time, greater linearity than that of prior art devices.

REFERENCES:
patent: 3887879 (1975-06-01), Radovsky
patent: 3974456 (1976-08-01), Russell et al.
patent: 4538116 (1985-08-01), Vyne
patent: 4587491 (1986-05-01), Koterasawa
patent: 4587494 (1986-05-01), Widlar
patent: 5034701 (1991-07-01), Debroux

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