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How or what are the constraints for deciding factors of envelope detector for AM As far as I know that charging time of capacitor should be below 20T where T is periodic time of carrier and discharging should not give negative clipping.But i cannot see how to apply them

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    \$\begingroup\$ Surely "below 20T where T is frequency of carrier" should read "where \$ T = \frac {1}{f} \$ where f is the frequency of the carrier? T would be then be the periodic time of the carrier which would make more sense. \$\endgroup\$ – Transistor Jul 1 '19 at 14:35
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You've given no specification for modulation bandwidth versus carrier. The finest way to extract AM modulation is the synchronous detector using a mixer to combine the AM-signal and a fixed-amplitude fixed-phase same-frequency local oscillator that is phaselocked.

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