TIMED_SLOPE_SAMPLING

Published:2009/7/20 21:31:00 Author:Jessie | From:SeekIC

Circuit measures rate of signal change for slowly varying signals (changing less than 1 V/min) by using sample-and-hold circuit to store instantaneous sample.After compatible time interval, sample is com-pared with new input current value; difference is then the desired slope. One limitation is that offset errors added to stored signal near zero voltage can cause large errors in the derivative. Circuit is highly sensitive to noise spikes during sampling.-R. E. Bober, This Derivative Circuit Handles Slowly Varying Signals, EDN Magazine, Jan. 20, 1976, p 82.



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