Audio power amplifier with automatic bias control

Details Audio power amplifier with automatic bias control Audio power amplifier with automatic bias control

1976-06-04

1978-02-28

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330268, 330296, H03F 326

Patent

active

040770133

ABSTRACT:
A power amplifier with an automatic bias control circuit is disclosed. The amplifier includes two complementary Darlington pairs operating in a push-pull mode providing output power. A bias control network including a switching transistor is coupled to the base circuits of the Darlington pairs for controlling the bias current delivered to the pairs. The transistor is switched on and off by a detecting circuit which senses the presence of input signals applied to the amplifier. The bias control network operates to minimize power consumption by the Darlington pairs when no input signal is present and to raise the bias level of the Darlington pairs without distortion in the output signal when an input is applied to the amplifier.

REFERENCES:
patent: 3439284 (1969-04-01), Carlson
patent: 3484867 (1969-12-01), Babcock
patent: 3914703 (1975-10-01), Stauffer
patent: 3984783 (1976-10-01), Bickley

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