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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

2
1
0.5
0

Correct Answer: 2

Explanation:

A_C cos ω_ct + 2 cos ω_mt cos ω_ct

A_C cosω_ct

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

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