The reason for using a precision OPAMP based rectifier diode for

The reason for using a precision OPAMP based rectifier diode for
| The reason for using a precision OPAMP based rectifier diode for detecting weak AM signals is that

A. the demodulation is easy

B. the signal is amplified and power is less

C. the noise is less and easy to filter

D. the cut-in voltage of the diode is reduced.

Please scroll down to see the correct answer and solution guide.

Right Answer is: D

SOLUTION

Precision Rectifier:

  • The major limitation of conventional rectifiers is that it cannot rectify AC voltages below a forward voltage drop VD (0.7 V) of a diode.
  • The precision rectifier makes It possible to rectify the input voltage of a very small magnitude, even less than the forward voltage drop of the diode.
  • The rectifier circuit used for circuit detection with op-amps is called precision rectifiers.


Ex. A precision half-wave rectifier using op-Amp includes a diode in the feedback loop as shown:

i.e. option (D) cut-in voltage of the diode is reduced

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