1.

An AM signal is detected using an envelope detector. The carrier frequency and modulation signal frequency are 1 MHz and 2 KHz respectively. An appropriate value for the time constant of the envelope detector is (a) 500 µsec (b) 20 µsec (c) 0.2 µsec (d) 1 µsec

Answer»

(b) 20 µsec 

that the time constant RC should satisfy the following condition

1/fc << RC < 1/fm

= 1/ 1 MHz << RC < 1/ 2KHz

= 1µs < RC < 0.5 ms



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