Question

In a diode AM detector with the output circuit consists of R = 1 M$\Omega$ and C = 1 pF would be more suitable for detecting a carrier signal of

• A. 1 MHz
• B. 0.1 MHz
• C. 0.5 MHz
• D. 10 MHz

Answer 1

Answer: (D)

10 MHz

Answer 2

: Here, RC$= 10^{6} \times 10^{- 12} = 10^{- 6}s$

For demodulation, $\frac{1}{\upsilon_{c}} < < RC$

$\upsilon_{c} > > \frac{1}{RC}or\upsilon_{c} > > \frac{1}{10^{- 6}} = 10^{6}Hz$

$\therefore\upsilon_{c} > > 10^{6}Hz$