Electronics and Communication Engineering - Exam Questions Papers - Discussion

14. 

Consider the amplitude modulated (AM) signal Ac cos ωct + 2 cos ωmt cos ωct For demodulating the signal using envelope detector, the minimum value of Ac should be

[A]. 2
[B]. 1
[C]. 0.5
[D]. 0

Answer: Option A

Explanation:

AC cos ωct + 2 cos ωmt cos ωct

AC cosωct

for envelope detection μ < 1 ⇒ < 1 ⇒ Ac should be at least-2.


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