# Envelope detector for AM signals

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

Question 2

• 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. – Transistor Jul 1 '19 at 14:35