Question

why we put a If device for demodulation​

Answer 1

The term demodulator is used because the demodulation process is considered to be the opposite of modulation. The output of an ideal detector must be an exact reproduction of the modulation existing on the rf wave. ... This nonlinear device is required to recover the modulating frequencies from the rf envelope.

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Answer 2

The term demodulator is used because the demodulation process is considered to be the opposite of modulation. The output of an ideal detector must be an exact reproduction of the modulation existing on the rf wave. This nonlinear device is required to recover the modulating frequencies from the rf envelope.