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A diode AM detector with the output circuit consisting of `R=1 kOmega` and `C=1 muf` would be more suitable for detecting a carrier signal of:A. 10 KHzB. 0.5 KHzC. 1 KHzD. 0.75 KHz |
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Answer» Correct Answer - A `R=10^(3) Omega` and `C=10^(-6)F` For detection of a carrier signal (demodulation) `RC gt gt 1/f` In this case `RC = 10^3 xx 10^(-6) = 10^(-3) s` In the given options, when f=10 Kz = `10xx10^3` Hz `1/f=1/(10xx10^3)=0.1xx10^(-3) s therefore RC gt gt 1/f` Thus the frequency 10 KHz can be detected For `f=10^3` Hz, `1/f=10^(-3)` s and the other frequencies of 0.5 KHz and 0.75 KHz cannot be used for detection. |
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