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Which of the following is the preferred metric when the desired signal bandwidth is less than Nyquist bandwidth?

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Which of the following is the preferred metric when the desired signal bandwidth is less than Nyquist bandwidth?

(a) Noise Power Ratio

(b) Spurious Free Dynamic Range (SFDR)

(c) Full Power Analog Input Bandwidth

(d) Half Power Analog Input Bandwidth

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My question is based upon ADC Tradeoffs topic in division Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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Right choice is (b) Spurious Free Dynamic Range (SFDR)

Easiest explanation: Spurious Free Dynamic Range is the preferred metric when the desired signal bandwidth is less than Nyquist bandwidth. First generation cellular base station is an example for this condition. The AMPS signal is much smaller in bandwidth when compared to the spectrum allocation accessed by a cell site ADC.

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