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Communication Systems

Q1: An AM signal is detected using an envelope detector, the carrier frequency and modulating signal frequency are 1 MHz and 2 kHz respectively. An appropriate value for the time constant of the envelope detector is

A 500 μ sec

B 20 μ sec

C 0.2 μ sec

D 1 μ sec

ANS:B - 20 μ sec

In envelope detector, for proper detection 10-6 ≤ RC ≤ 250 μ sec. Only 20 m sec satisfies the condition.



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