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BCECE Engineering BCECE Engineering Solved Paper-2012

  • question_answer
    In a diode AM detector, the output circuit consists of \[R=1\,k\Omega \]and \[C=10\,pF.\]A carrier signal of 100 k Hz is to be detected. Is it good?

    A)  Yes                       

    B)         No

    C)  Information is not sufficient

    D)  None of the above

    Correct Answer: B

    Solution :

    For better demodulation \[\frac{1}{{{f}_{c}}}<<RC\]                 Here,\[\frac{1}{{{f}_{c}}}=\frac{1}{100\times {{10}^{3}}}={{10}^{-5}}s\]                 and \[RC={{10}^{3}}\times 10\times 10\times {{10}^{-12}}\]                                 \[={{10}^{-8}}s\]  So,\[\frac{1}{{{f}_{c}}}\] is not less than RC. Hence, it is not good


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