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Which of the following is AM demodulation techniques?

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Which of the following is AM demodulation techniques?

(a) Square law demodulator and Envelope detector

(b) Ratio detector and PLL detector

(c) PLL detector and Coherent detector

(d) PLL detector

The question was asked in my homework.

Asked question is from Need of Transducers in portion Receivers & Transducers of Analog Communications

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

The best I can explain: AM signals are detected or demodulated using Square law demodulator and Envelope detector. The demodulator extracts the information from the received AM signal.

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