Question

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

• A. $<<{10}^{9}Hz$
• B. equal to ${10}^{9}kHz$
• C. $>>{10}^{9}Hz$
• D. ${10}^{8}kHz$

Answer 1

The correct option is A $<<{10}^{9}Hz$

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