DARLINGTON_PAIR_SERVO_AMPLIFIER

Published:2009/7/23 23:19:00 Author:Jessie | From:SeekIC

Open-loop gain of differential forward amplifier Q1 through Q8 is over 2,000 and dosed-loop gain is 200. Signal across output of common-mode feedback amplifier Q9-Q10 is differentially summed by R21-R22 to cancel a-c components, while d-c component is amplified and applied to emitters of differential-input Darlington pair.-M. W. Aarons, Putting a Servo Amplifier on a Small Silicon Wafer, Electronics, 35:52, p 33-35.



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