Discussion
What does noise factor express?
Answer: B
Noise factor is the ratio by which a stage worsens the signal-to-noise ratio, referenced to a standard temperature so devices can be compared, and noise figure is the same quantity in decibels. Absolute noise power depends on bandwidth as well and is a different measure. Gain and saturation are separate specifications. And measurement bandwidth is a condition rather than the figure. Every noise specification names either a degradation or a power, and the two must not be confused.
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