AGC_AMPLIFIER

Published:2009/6/30 22:24:00 Author:May | From:SeekIC

FET used in conjunction with opamp permits varying of gain by changing ratio of Rf to Rin. Offset voltage in output due to input bias currents is minimized by placing FET in parallel with 5.1K resistor between noninverting leg of opamp and ground, so resistance varies with changes of It,,- Low Frequency Applications of Field-Effect Transistors, Motorola, Phoenix, AZ, 1976, AN-511A, p 9.



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