Question

In the given detector circuit, the suitable value of carrier frequency is

• A. << 10⁹ Hz
• B. << 10⁵ Hz
• C. >> 10⁹ Hz
• D. None of these

Answer 1

The correct option is A << 10⁹ Hz

Using $\frac{1}{f_{carrier}}$ <<RC
We get time constant, RC = 1000 $\times {10}^{-12}={10}^{-9}s$
Now v = $\frac{1}{T}=\frac{1}{{10}^{-9}}$Hz
Thus the value of carrier frequency should be much less that ${10}^9$ Hz, say 100 kHz