Noise factor and noise figure

Q10. Noise Factor(F) and Noise Figure(NF) are related as


a) NF= 10 log10(F)
b) F= 10 log10(NF)
c) NF= 10 (F)
d) F= 10 (NF)

Correct Answer: a) NF= 10 log10(F)

Explanation :

Noise figure (NF) and noise factor (F) signify the degradation of the signal-to-noise ratio (SNR) for any system due to components in a radio frequency (RF) signal . They give the performance of the system.The noise factor of a system is defined as the ratio of output noise power (Pno) to input noise power (Pni):
F = Pno/ Pni, at standard room temperature 290K
Noise Factor when expressed in decibels, it is called noise figure.
i.e. NF= 10 log10(F)
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