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Discussion :: Communication Systems

  1. A device with input x(t) and y(t) is characterized by y(t) = x2(t). An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is

    2. A.
    370 kHz
    B.
    190 kHz
    C.
    380 kHz
    D.
    95 kHz

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    Answer : Option C

    Explanation :

    If we square the signal, bandwidth will becomes double.

    B.W. for x(t) = 2(90 + 5) = 190 kHz

    for x2(t) = 2 x 190 380 kHz.

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