Discussion
Noise figure of a receiver stage expresses
Answer: B
Noise figure is the ratio by which the stage worsens the signal-to-noise ratio, expressed in decibels, and it is defined against a standard reference temperature so that stages can be compared. Absolute noise power depends on the bandwidth and is a different quantity. Gain is separate, although it strongly affects how much the following stages contribute through the cascade formula. And usable bandwidth is a further independent specification.
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