Question

What happens if the input frequency is kept lower than the frequency at which the gain is zero?

(a) Circuit act like a perfect integrator

(b) Circuit act like an inverting amplifier

(c) Circuit act like a voltage follower

(d) Circuit act like a differentiator

I got this question during an internship interview.

I need to ask this question from Integrator topic in section Operational Amplifier Applications of Linear Integrated Circuits

Answer 1

Right choice is (b) Circuit act like an inverting amplifier

Simplify with an easy explanation: If the input frequency is lower that the lower frequency limit of the integrator (i.e. when gain = 0), there will be no integration results and the circuit act like a simple inverting amplifier.