Question

In a FM receiver, amplitude limiter ________

(a) eliminates any change in amplitude of received FM signals

(b) eliminates any change in frequency of received FM signals

(c) reduce the amplitude of received signals

(d) amplifies low frequency signals

I have been asked this question in an international level competition.

Query is from Demodulation of SSB with Large Carrier topic in section SSB Modulation of Analog Communications

Answer 1

Right option is (a) eliminates any change in amplitude of received FM signals

For explanation: Amplitude Limiter circuit is used in FM receiver to remove the noise or any variation in amplitude present in the received signal. Thus, the output of the amplitude limiter has a constant amplitude. So it is only used in frequency modulation and not in amplitude modulation.