POLARITY_IGNORlNG_VOLTAGE_FOLLOWER

Published:2009/6/25 22:02:00 Author:May | From:SeekIC

Absolute-value circuit is basically voltage follower A1 whose input is positive regardless of polarity of VIN. With positive input, inverting amplifier A2 is disconnected by D1. With negative input, inverting amplifier applies poshive input to voltage follower through D1. Output voltage is thus absolute value of input voltage.-R. J. Wincentsen, Absolute Value Circuit Uses Only Five Parts, EDN Magazine, Nov. 1,1972, p 44.



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