Emitter-follower type SEPP circuit

Details Emitter-follower type SEPP circuit Emitter-follower type SEPP circuit

1984-04-11

1985-12-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330274, H03F 326

Patent

active

045582882

ABSTRACT:
An emitter-follower type SEPP circuit in which, by detecting idle currents and distortion components and feeding such signals back to an error amplifier in a real time mode, a very stable circuit with little crossover distortion is provided. The input signal is applied through opposite-polarity bias potential sources to noninverting first terminals of first and second error amplifiers, one for the positive half cycle and the other for the negative half cycle. The outputs of the two error amplifiers are applied through constant current sources to bases of respective bipolar transistors, the emitters of which are connected in a feedback arrangement to noninverting input terminals of the two amplifiers. The emitters of the two bipolar transistors are further connected through a resistance network to an output terminal. The resistance network also has a feedback terminal, which is connected through third and fourth bias potential sources to respective noninverting input terminals of the two amplifiers.

REFERENCES:
patent: 4306199 (1981-12-01), Kondou
patent: 4370623 (1983-01-01), Nagasawa
patent: 4439743 (1984-03-01), Schwarz et al.

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