JEE Main & Advanced Physics Communication System / संचार तंत्र Question Bank Critical Thinking

  • question_answer
    In a diode AM-detector, the output circuit consist of R = 1kW and C = 10 pF. A carrier signal of 100 kHz is to be detected. Is it good

    A)            Yes 

    B)            No

    C)            Information is not sufficient

    D)            None of these

    Correct Answer: B

    Solution :

                       For demodulation \[\frac{1}{{{f}_{c}}}<<RC\] \[\frac{1}{{{f}_{c}}}=\frac{1}{100\times {{10}^{3}}}={{10}^{-5}}s\] \[RC={{10}^{3}}\times 10\times {{10}^{-12}}s\]= 10?8 s We see that \[\frac{1}{{{f}_{c}}}\] here is not less than RC as required by the above condition. Hence, this is not good.


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