Question

Choose the minimum number of op-amps required to implement the given expression. \[ V_o = \left[ 1 + \frac{R_2}{R_1} \right] V_1 - \frac{R_2}{R_1} V_2 \]

• A. Two
• B. Four
• C. Three
• D. One

Hint:

A single op-amp in differential configuration is sufficient for performing both subtraction and scaling of two input signals.

Answer 1

The Correct Option is D

The given expression represents the output of a differential amplifier where one op-amp is used to perform both subtraction and amplification. Therefore, only one op-amp is needed to implement this.