Norton_precision_comparator

Published:2009/7/17 4:46:00 Author:Jessie | From:SeekIC

This circuit uses two sections of an LM3900 to form a precision comparator. The current established by VREF at the (-) input of amplifier 1 causes Q1 to adjust VA. The value of VA causes an equal current to flow into the (+) input of amplifier 2. This current corresponds more exactly to the reference current of amplifier 1 National Semiconductor, Linear Applications Handbook 1991 p 244.



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