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The Nyquist criterion states that the sampling frequency of a band limited analog waveform must be at least ______ component to properly reconstruct the signal.

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The Nyquist criterion states that the sampling frequency of a band limited analog waveform must be at least ______ component to properly reconstruct the signal.

(a) half the maximum frequency

(b) twice the maximum frequency

(c) half the minimum frequency

(d) twice the minimum frequency

I had been asked this question in an online interview.

Query is from RF and IF Processing Tradeoffs topic in division Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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Right option is (b) twice the maximum frequency

The best explanation: The Nyquist criterion states that the sampling frequency of a band limited analog waveform must be at least twice the maximum frequency component to properly reconstruct the signal. Aliasing can be overcome by meeting Nyquist criterion and using filters.

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