Precision full-wave signal rectifier needs no diodes

Rectifier circuits based on semiconductor diodes typically handle voltage levels that greatly exceed the diodes’ forward-voltage drops, which generally don’t affect the accuracy of the rectification process. However, the rectified signal’s accuracy suffers when the diode’s voltage drop exceeds the applied voltage. Precision rectifier circuits combine diodes and operational amplifiers to eliminate the effects of diode voltage drops and enable high-accuracy, small-signal rectification.

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Precision full-wave signal rectifier needs no diodes