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A product detector in AM systems is also called ___________

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A product detector in AM systems is also called ___________

(a) Envelope detector

(b) Differentiator

(c) Integrator

(d) Phase detector

This question was posed to me by my school principal while I was bunking the class.

The doubt is from Amplitude Modulation topic in portion Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct choice is (d) Phase detector

Explanation: A product detector is also called a phase detector. It forms a coherent demodulator for AM signals. It is a down converter circuit which converts the input bandpass signal to a baseband signal.

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