Conventional window comparators suffer interaction between the width and the center of the window; this makes adjusting these parameters time consuming. By using a precision dual 100uA current reference (REF200), this interaction is eliminated. The width of the comparator window is determined by the reference current and the value of P1: V = 100uA * 20k. The DC voltage of the window center is set by the % rotation of the potentiometer P1. With the pot at its center (50%), the center of the comparator window is at zero volts– thus the window is +/-1V. The window center adjustment is illustrated below. (Circuit is created by Neil P. Albaugh TI- Tucson)
Comparator Window Settings circuit:
Online Simulation of the Comparator Window Settings Circuit
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