COMEDK · Physics · 31. Communication System
In detector, output circuit consists of \(R=10 \mathrm{k} \Omega\) and \(C=100 \mathrm{pF}\). The frequency of carrier signal which it can detect is
- A \(>>1 \mathrm{MHz}\)
- B \(0.1 \mathrm{kHz}\)
- C \(>>1 \mathrm{GHz}\)
- D \(10^{3} \mathrm{~Hz}\)
Answer & Solution
Correct Answer
(A) \(>>1 \mathrm{MHz}\)
Step-by-step Solution
Detailed explanation
\(R = 10\,\text{k}\Omega = 10^4\,\Omega\), \(C = 100\,\text{pF} = 10^{-10}\,\text{F}\) \(RC = 10^4 \times 10^{-10} = 10^{-6}\,\text{s}\) For successful demodulation: \(RC \gg T_c \Rightarrow f_c \gg \dfrac{1}{RC}\) \(f_c \gg \dfrac{1}{10^{-6}} = 10^6\,\text{Hz} = 1\,\text{MHz}\)…
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