Question

Which of the following statement about Amplitude Limiter is not true?

(a) The circuit is always biased in class C amplifier

(b) When the input increases and becomes greater than the threshold of limiting, the gain starts decreasing

(c) The output must be tuned

(d) Leak-type bias must be used

The question was posed to me during an online interview.

This intriguing question comes from Noise for SSB-SC topic in portion Noise of Analog Communications

Answer 1

Correct choice is (a) The circuit is always biased in class C amplifier

The explanation is: Amplitude Limiter removes the amplitude of output signals to the desired margin irrespective of variations in the input signal. It is always biased in class C amplifier by virtue of the leak-type bias. Amplitude limiter is present in FM receiver and not AM receiver.