OP Amp MCQ Questions & Answers | Electrical Engineering

The common mode gain is very low.

Key Points:
Common Mode Gain: In an operational amplifier (op-amp), common mode gain refers to the gain applied to signals that are present on both the inverting and non-inverting inputs.
Purpose: For ideal op-amps, the common mode gain should be extremely low to ensure that the amplifier responds primarily to differential signals (the difference between the inverting and non-inverting inputs).
Practical Op-Amps: In real op-amps, although the common mode gain is not zero, it is minimized to enhance performance and accuracy in amplifying differential signals.

For an operational amplifier (OP-amp) with negative feedback, the following is true:

The output is fed back to the inverting input: Negative feedback involves taking a portion of the output and feeding it back to the inverting input of the OP-amp.

This feedback helps stabilize the gain and improve the performance of the OP-amp by reducing distortion and ensuring that the output closely follows the input signal.

Negative feedback does not make the output equal to the input, increase the output, or feed the output back to the noninverting input.