Bias control circuit for an audio amplifier utilizing an unsatur

Details Bias control circuit for an audio amplifier utilizing an unsatur Bias control circuit for an audio amplifier utilizing an unsatur

1975-12-22

1976-10-05

Rolinec, R. V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 13, 330 15, 330 22, 330 40, H03F 316

Patent

active

039847829

ABSTRACT:
A power amplifier stage for an audio amplifier is constituted by a complementary pair of one N channel and one P channel unsaturated function FETs forming a single ended pushpull circuit. The stage is energized by a first d.c. power source. The gate potentials of the FETs are controlled by a series of control type constant voltage source comprising a pair of complementary series connected control transistors energized by a second d.c. power source which varies at the same rate as the first d.c. power source. A comparison circuit including a second pair of complementary transistors is connected to a d.c. reference voltage which varies to a smaller level than the first and second d.c. power sources in order to provide a constant quiescent current flowing in the drain circuits of the FETs even if the first and second d.c. voltage levels fluctuate.

REFERENCES:
patent: 3921089 (1975-11-01), Tsurushima

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