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A modulated signal is given
x(t) = 10 cos (2π × 105 t) + 6 cos (2π × 103t)cos (2π × 105t)
This signal is to be detected by a linear diode. The most suitable value of resistance if the capacitor is of 100 pF is
  • a)
    10 kΩ
  • b)
    1 kΩ
  • c)
    1 MΩ
  • d)
    100 MΩ
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A modulated signal is givenx(t) = 10 cos (2π × 105 t) + 6 cos...
For demodulation of Am using envelope detector the time constant of circuit is given by

ω  → Bandwidth of the message signal
Application
The message signal can be rewritten as:
10 (1 + 0.6 cos (2π × 103t)) cos (2π × 105 t)
here
fc = 105 Hz
fm = 103 Hz

105 < R < 107
10 kΩ < R < 10 MΩ 
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A modulated signal is givenx(t) = 10 cos (2π × 105 t) + 6 cos (2π × 103t)cos (2π × 105t)This signal is to be detected by a linear diode. The most suitable value of resistance if the capacitor is of 100 pF isa)10 kΩb)1 kΩc)1 MΩd)100 MΩCorrect answer is option 'C'. Can you explain this answer?
Question Description
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