Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

2008-08-03

2010-06-22

Pascal, Robert (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

C330S141000

Reexamination Certificate

active

07741905

ABSTRACT:
An automatic gain control circuit includes a first voltage dividing resistor, a filter circuit, a switch circuit, and an amplifying circuit. The first voltage dividing resistor divides a voltage of the automatic gain control circuit using an internal impedance of the audio device to produce a divided DC voltage, wherein the first voltage dividing resistor is connected between a first power source and an output of the audio device. The filter circuit filters audio signals outputted from the audio device to produce filtered audio signals, and wherein the filter circuit receives the divided DC voltage, wherein the filter circuit is connected to the output of the audio device. The switch circuit outputs controlling signals according to the divided DC voltage from the filter circuit. The amplifying circuit amplifies the filtered audio signals according to the controlling signals. An electronic device using the automatic gain control circuit is also provided.

REFERENCES:
patent: 4255716 (1981-03-01), Takada
patent: 5281925 (1994-01-01), Hulick

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