Discussion
An envelope detector consists essentially of
Answer: B
The classic detector is a diode and an RC network: the diode rectifies and the capacitor holds the peaks while the resistor lets the envelope fall, so the output follows the envelope. Its cheapness is the reason AM broadcasting reached the mass market. A multiplier with a local oscillator is a synchronous or coherent detector, needed for suppressed-carrier signals. A phase-locked loop with a limiter is an FM discriminator. And a square-law device needs a low-pass output filter, not a band-pass one at the carrier.
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