A message signal mt=4cos2000πt modulates the carrier ct=cos2πfct where fc=1 MHz to produce an AM signal. For demodulation using envelope detector the time constant RC should satisfy
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a
0.5 ms < RC < 1ms
b
1 μs < RC < 1 ms
c
RC < 1μs
d
RC >> 1μs
answer is B.
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Detailed Solution
Given : fc=1 MHz , ωf=2000Hz⇒2πfm=2000Hz⇒fm=1000 Hz The time constant RC , should satisfy, 1fc