AGC

358

08:18:38

Automatic gain control, input signal is the sine wave(pink). Output is blue.
Configure with D.C and pot.
Currently has max gain of 62 (~10mV input) to 29 (0.5V input).
Anything beyond that begins distorting due to amplifier limitations (and MOSFET asymmetric conduction)
Working: Gain is Rf÷Ri, Ri low initially as MOSFET kept on by D.C source. As output amplitude increases, D.C is offset and MOSFET conduction reduces, gain reduces

published 12 years ago

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