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 a radio receiver can be specified.
The noise factor is defined as the ratio of the output noise power of a device to the portion thereof attributable to thermal noise in the input termination at standard noise temperature T0 (usually 290 K). The noise factor is thus the ratio of actual output noise to that which would remain if the device itself did not introduce noise, or the ratio of input SNR to output SNR.
The noise figure is simply the noise factor expressed in decibels (dB).
Read more about Noise Figure: General, Definition
Famous quotes containing the words noise and/or figure:
“Speak, ye that ride on white asses, ye that sit in judgment, and walk by the way.
They that are delivered from the noise of archers in the places of
drawing water, there shall they rehearse the righteous acts of the
Lord,”
—Bible: Hebrew Judges (l. V, 10–11)
“For an actress to be a success, she must have the face of Venus, the brains of a Minerva, the grace of Terpsichore, the memory of a Macaulay, the figure of Juno, and the hide of a rhinoceros.”
—Ethel Barrymore (1897–1959)