INDEPENDENT_HYSTERESIS_ADJUSTMENT

Published:2009/6/29 1:59:00 Author:May | From:SeekIC

Trip point and hysteresis of comparator opamp A1 can be adjusted independently, with trip point being determined by setting of R1 or programmed by DC voltage applied to R2. Opamp A2 provides polarity inversion and rectification of A2 output. Hysteresis control R8 is in feedback path from A2 back to A1. Amount of hysteresis is determined by ratio of R3 to R8. With values shown, circuit output levels are 0 and 5 V.—G.Tobey, Comparator with Noninteracting Adjustments, EDN|EEE Magazine, Oct, 1, 1971, p 43.



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