Question

How we limit the response of a receiver to a weak signal?

(a) by the AGC

(b) by the noise that is generated in the receiver

(c) by the dynamic range of the receiver

(d) by the type of detector circuit being used

This question was posed to me during an interview.

Query is from Instantaneous Frequency and Frequency Modulation in division Angle Modulation of Analog Communications

Answer 1

Correct option is (b) by the noise that is generated in the receiver

For explanation I would say: The response of a receiver to weak signals is limited by the noise. This noise is generated in the receiver only. Noise is the unwanted signal that is present in the passband of the signal.