OUAD_GAIN_CONTROL

Published:2009/6/30 2:20:00 Author:May | From:SeekIC

Combination of National AM97C11 quad FET and LM324 quad opamp gives tracking gain control having 40-dB range. Bandwidth is 10 kHz minimum, and S/N ratio is better than 70 dB for 4.3-VRMS maximum output. Temperature sensitivity of FET can be reduced by using silicon resistor for opamp feedback resistor R1.- FET Databook, National Semiconductor, Santa Clara, CA, 1977, p 6-39-6-46.



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