INTERNALLY_GATED_WINDOW_COMPARATOR

Published:2009/6/29 1:25:00 Author:May | From:SeekIC

Operation is based on fact that source and sink currents available at pin 8 of 101 opamp are unequal, with negative-going drive being larger. Voltage at pin 8 is low if either comparison input (A1 or A2 so dictates. Both A1 and A2 must have high outputs for pin 8 to be high. Outputs of A1 and A2 thus follow pin 8 since opamps have unity gain. D1 and D2 form clamp network. Either output of A1 or A2 can be used. Outputs go to +5 V only when input voltage is in window established by upper and lower voltage limits.-W. G. Jung, IC Op-Amp Cookbook, Howard W, Sams, Indianapolis, IN, 1974, p 231-232.



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