PRECISION_ABSOLUTE_VALUE

Published:2009/7/6 7:05:00 Author:May | From:SeekIC

Circuit using two Precision Monolithics OP-07 opamps provides precise full-wave rectification by inverting negative-polarity input voltages and operating as unity-gain buff er for positive-polarity inputs. Applications include positive-peak detectors, single-quadrant multipliers, and magnitude-only measuring systems. For positive inputs, circuit simply operates as two unity-gain amplifier stages. Negative input turns D1 off and D2 on, changing resistor currents precisely enough to give overall circuit gain of -1. Design equations are given.-D. Soderquist and G. Erdi, The OP-07 Ultra-Low Offset Voltage Op Amp-a Bipolar Op Amp That Challenges Choppers, Eliminates Nulling, Precision Monolithics, Santa Clara, CA, 1975, AN-13, p 10.



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