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Which devices did we use for AM Demodulation?

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Which devices did we use for AM Demodulation?

(a) Envelope detector and Square law demodulator

(b) PLL detector and Foster-Seeley discriminator

(c) Ratio detector and Slope detector

(d) Only quadrature detector

This question was posed to me during an interview.

This intriguing question originated from Frequency Domain Description in chapter Amplitude Modulation of Analog Communications

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Correct choice is (a) Envelope detector and Square law demodulator

To explain: AM signals can be demodulated using Square law demodulator or Envelope detector. Demodulator extracts information from received AM signal by decoding it. Other options are the demodulators for FM signal.

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