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Which one of the following is not a useful quantity for comparing the noise performance of receivers?

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Which one of the following is not a useful quantity for comparing the noise performance of receivers?

(a) Input noise voltage

(b) Signal To Noise Ration

(c) Noise Figure

(d) Figure of merit

I had been asked this question in exam.

This key question is from Noise for DSB-SC in division Noise of Analog Communications

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Best answer
The correct option is (a) Input noise voltage

The best explanation: Noise performance of different receivers cannot be compared on the basis of input noise voltage. It can be calculated on the basis of figure of merit, or noise figure, or on the basis of equivalent noise resistance.

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