COMPARATOR_WITH_VARIABLE_HYSTERESIS_WITHOUT_SHIFTING_INITIAL_TRIP_POINT

Published:2009/6/25 1:34:00 Author:May | From:SeekIC

An operational amplifier can be used as a convenient device for analog comparator appli-cations that require two different trip points. The addition of a positive-feedback network introduces a precise variable hysteresis into the usual comparator switching action. Such feedback develops two comparator trip points centered about the initial trip point or refer-ence point. The voltage difference, AY, be-tween the trip points can be adjusted by varying resistor R2. When the output voltage is taken from the zener diode, as shown, it switches between zero and Vz, the zener voltage.



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