ANTILOG_GENERATOR

Published:2009/7/14 3:16:00 Author:May | From:SeekIC

Basic log generator circuit is rearranged to pelform inverse operation of antilog (exponential) generation. Exponential current generated by O2 is summed at current-to-voltage converter A2.Q1 voltage drive to Q2 is such that collector cument ofQ2 is exponentially related to voltage at base of Q1.Temperature-compensating divider scales input sensitivity to 1V per decade. Feed-forward connections at A1 andA2 optimize circuit for speed.-W. G. Jung, IC 0p-Amp Cookbook, Howard W. Sams, Indianapolis, IN, 1974, p 214-216. '



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