Question

Which of the following improvements is (are) a result of the negative feedback in a circuit?

(a) Higher input impedance

(b) Better stabilized voltage gain

(c) Lowered frequency response

(d) Higher input impedance & Better stabilized voltage gain

The question was posed to me at a job interview.

The question is from Oscillators topic in section Power Amplifiers of Electronic Devices & Circuits

Answer 1

Correct answer is (d) Higher input impedance & Better stabilized voltage gain

To elaborate: The applied negative feedback can improve its performance (gain stability, linearity, frequency response, step response) and reduces sensitivity to parameter variations due to manufacturing or environment. Because of these advantages, many amplifiers and control systems use negative feedback.