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In down-conversion multiplication with cosine wave is followed by

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In down-conversion multiplication with cosine wave is followed by

(a) Low pass filter

(b) High pass filter

(c) Bandpass filter

(d) Bandstop filter

This question was posed to me during an interview.

The doubt is from Signals in portion Signals and Spectra of Digital Communications

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Correct choice is (a) Low pass filter

For explanation: Downconversion of bandpass signal includes multiplication with sine wave followed by low pass filtering.

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