If an amplitude modulated wave 10[1+0.6 cos 2π103t] cos 2π.106.t is to be detected by a linear diode detector, then the time constant will be:

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If an amplitude modulated wave 10[1+0.6 cos 2π103t] cos 2π.106.t is to be detected by a linear diode detector, then the time constant will be:

35) If an amplitude modulated wave 10[1+0.6 cos 2π10³t] cos 2π.10⁶.t is to be detected by a linear diode detector, then the time constant will be:

1. 1.7 msec [Option ID = 2969]
2. 0.17 msec [Option ID = 2970]
3. 17 msec [Option ID = 2971]
4. 0.17 sec [Option ID = 2972]

Answer: 2

Solution

to detect envelope the time constant, t will be

1/carrier frequency << t << 1/message frequency

Here, 1/10^6 << t << 1/10^3

It should be greater than 1 microsec but less than 1 millisecond

so, correct answer is 0.17 msec

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