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  1. 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

    2. A.
    500 μ sec
    B.
    20 μ sec
    C.
    0.2 μ sec
    D.
    1 μ sec

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    Answer : Option B

    Explanation :

    In envelope detector, for proper detection

    10-6 ≤ RC ≤ 250 μ sec.

    Only 20 m sec satisfies the condition.

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