Question

The main advantage of a precision rectifier over a diode rectifier is

• A. Accurate rectification of small signals
• B. No transformer is required
• C. High power handling
• D. High ripple voltage

Hint:

A precision rectifier is also called a \[ \boxed{\text{Super diode}} \] because it removes the effect of the diode forward voltage drop.

Answer 1

The Correct Option is A

Step 1: Recall the limitation of an ordinary diode rectifier. A silicon diode requires approximately \[ 0.7\,\text{V} \] before it conducts. Hence, very small input signals cannot be rectified accurately.

Step 2: State the advantage of a precision rectifier. A precision rectifier uses an op-amp to eliminate the effect of the diode's forward voltage drop. Thus, it can accurately rectify very small signals. Therefore, \[ \boxed{\text{Accurate rectification of small signals}} \] is the correct answer. \[ \boxed{(A)} \]