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Q1: 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

ANS:A - 2

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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