# Noise factor and noise figure

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

**Options: **

a) NF= 10 log_{10}(F)

b) F= 10 log_{10}(NF)

c) NF= 10 (F)

d) F= 10 (NF)

Correct Answer: a) NF= 10 log_{10}(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 (P_{no}) to input noise power (P_{ni}):

F = P_{no}/ P_{ni}, at standard room temperature 290K

Noise Factor when expressed in decibels, it is called noise figure.

i.e. NF= 10 log_{10}(F)