Equivalent noise resistance
In
telecommunication, an
equivalent noise resistance is a quantitative representation in resistance units of the
spectral density of a
noise-
voltage generator, given by
R n = (π
W n)/(k
T 0), where
W n is the spectral density, k is
Boltzmann's constant,
T 0 is the
standard noise temperature (290 K), and k
T 0 = 4.00 × 10
-21 watt-seconds.
Note: The equivalent noise resistance in terms of the mean-square noise-generator voltage, e 2, within a frequency increment, Δf , is given by R n = e 2/(4kT 0Δf ).
Source: from Federal Standard 1037C