AUTOMATIC_NULLING

Published:2009/7/9 23:05:00 Author:May | From:SeekIC

Simple offset zeroing loop reduces effective input offset of instrumentation amplifier to less than a microvolt by using zero-and-hold that nulls output of instrumentation opamp A1 to reference ground. Article describes operation in detail. Input signal source drives logic input, for nulling up to 4 V without using external nulling pot,.Typical input circuit using strain gages is shown at left of dashed line.-M. Cerat, Zeroing Loop Reduces Instrumentation Amplifier Offsets, EDN Magazine, March 20, 1976, p 100 and 102.



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