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Noise performance of a square law demodulator of AM signal is?

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Noise performance of a square law demodulator of AM signal is?

(a) Better than that of synchronous detector

(b) Weaker than that of synchronous detector

(c) Better than that of envelope detector

(d) Weaker than that of envelope detector

The question was posed to me in quiz.

The origin of the question is Power Relations in AM Waves topic in chapter Amplitude Modulation of Analog Communications

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Correct answer is (a) Better than that of synchronous detector

To explain I would say: Process of recovering message signal from received modulated signal is called demodulation. It is exactly opposite to modulation. There are two most used AM demodulators: Square Law Demodulator and Envelope Demodulator. Noise performance of Square Law Demodulator is far better than that of Synchronous Detector.

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