ADJUSTABLE_INPUT_IMPEDANCE

Published:2009/7/13 4:18:00 Author:May | From:SeekIC

Q4, Q1, and Q2 in negative feedback loop encompass Q2 and Q3 in positive loop, to give stoble amplifier with input conductance of zero (infinite impedance) and unity gain for almost any output load, with output of l0 v p-p at 1 ma.-R. L. Willett, Positive and Negative Feedback Multiply Amplifier Input Impedance, Electronics, 34:27, p 52-53.



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