Linear alternating-current amplifier

Details Linear alternating-current amplifier Linear alternating-current amplifier

1979-04-26

1981-05-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

H03F 330

Patent

active

042661994

ABSTRACT:
A linear alternating-current amplifier with push-pull-connected first and second output transistors Q.sub.1, Q.sub.2 includes a pilot transistor Q.sub.4 and a control transistor Q.sub.3 which drives the first output transistor Q.sub.1 into saturation when the resistance of the pilot transistor Q.sub.4 is high. The control transistor Q.sub.3 has its base connected to the collector of the pilot transistor Q.sub.4 and its emitter connected to the junction of the emitter of the first output transistor Q.sub.1 with the collector of the second output transistor Q.sub.2, the latter connection including a biasing resistor R in series with a constant-current generator G (or an equivalent resistor R.sub.G or fixedly biased transistor Q.sub.G) which maintains the potential difference between the base and the emitter of the control transistor Q.sub.3 at its conduction threshold during saturation of the pilot transistor Q.sub.4 and the second output transistor Q.sub.2.

REFERENCES:
patent: 3904974 (1975-09-01), Fukata et al.

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