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Envelope Detector is a/an ________

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Envelope Detector is a/an ________

(a) Coherent detector

(b) Asynchronous Detector

(c) Synchronous Detector

(d) Product Demodulator

This question was addressed to me in an internship interview.

My question is based upon Envelope Detector in division Amplitude Modulation of Analog Communications

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Right choice is (b) Asynchronous Detector

Explanation: An envelope detector is used to demodulate a previously modulated signal by removing all high frequency components of the signal. The capacitor and resistor form a low-pass filter to filter out the carrier frequency. Envelope detectors are asynchronous in nature. The advantage of asynchronous over synchronous is that it is simple, cheap and setup is faster.

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