Automatic gain control circuit arrangements having a plurality o

Details Automatic gain control circuit arrangements having a plurality o Automatic gain control circuit arrangements having a plurality o

1975-05-27

1977-01-04

Griffin, Robert L.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

325409, 325413, 330 29, 330 98, 330139, H04B 116

Patent

active

040016943

ABSTRACT:
Automatic gain control is provided in a two stage amplifier in which the first stage has a signal voltage gain related to its supply voltage and the second, or output, stage comprises an output transistor. The load of the output stage comprises an earphone in series with the supply. The supply for the first stage is taken from the junction of the output transistor and the earphone such that the gain varies inversely with the output of the earphone. The amplifier stages may be formed as a monolithic integrated circuit and contained in the housing of the earphone.

REFERENCES:
patent: 2866892 (1958-12-01), Barton
patent: 3029340 (1962-04-01), Englund
patent: 3258695 (1966-06-01), Brown et al.

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