AGC_WITH_CMOS_LOGIC

Published:2009/6/30 22:14:00 Author:May | From:SeekIC

First stage U2, using CD4007AE, is wired as two-line demultiplexer with only one output acting as transmission gate. Gain is lower in first stage to reduce noise. U1 is used as three-stage high-gain audio amplifier in which first two stages have low-pass filtering for stability. AGO voltage, developed from audio output, is fed back to U, to turn transmission gate off when gain must be reduced. Audio output is about 2.5 V P-P for inputs of 2 mV and greater.-K. H. Fleischer, Tum Dig-ital CMOS IC's into a Low-Level AGC Amplifier, EDNMagazine, Oct.5,1977, p 99.



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