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Noise figure (NF) and noise factor (F) are measures of degradation of the signal-to-noise ratio (SNR), caused by components in a radio frequency (RF) signal chain. It is a number by which the performance of an amplifier or a radio receiver can be specified, with lower values indicating better performance.
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The noise figure is simply the noise factor expressed in decibels (dB).
NF NF = 10*log10(F) (Eq. 3)