precision rectifier

Thread Starter

shruthi kashyap

Joined Nov 18, 2011
can any one tell me why the word precision is used in precision rectifier and what is the difference between precision rectifier and the normal rectifier... it`s urgent


Joined Oct 2, 2009
A simple rectifier circuit uses a diode. The input voltage has to exceed the turn-on voltage (0.6V for ordinary Si diode) before rectification is achieved.

A precision rectifier is an active circuit using an opamp and a diode in the feedback loop. This overcomes the turn-on "knee" voltage.


Joined Mar 24, 2008
To add to what MC said, this is useful for test equipment, where eliminating extra variables is required.


Joined Mar 14, 2008
The op amp reduces the turn-on voltage of a diode in its feedback loop by a factor equal to the open-loop gain of the op amp. For practical op amp gains this reduces the forward voltage to a fraction of a mV, thus giving a "precision" or near ideal diode characteristic for the rectifier function.