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AM system use only product detector for demodulation. They never use envelope detectors.

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AM system use only product detector for demodulation. They never use envelope detectors.

(a) True

(b) False

The question was asked by my college professor while I was bunking the class.

This intriguing question originated from Amplitude Modulation topic in portion Modulation Techniques for Mobile Radio of Wireless/Mobile

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Correct choice is (b) False

For explanation I would say: AM systems can use either product detector or envelope detector for demodulation. As a rule, envelope detectors are useful when input signal power is at least 10dB greater than noise power, whereas product detectors are able to process the AM signals with input signal to noise ratios well below 0 dB.

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