Equivalent noise resistance explained

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} = (\pi W _{n})/(k T _{0}) where W _{n} is the spectral density, k is the Boltzmann constant, T _{0} is the standard noise temperature (290 K), so kT _{0} = 4 . 00 x 10 ^{-21} [Ws] .

Note: The equivalent noise resistance in terms of the mean-square noise-generator voltage, e², within a frequency increment, Δ f, is given by

R _{n} = (e ^{2})/(4 k T _{0\Delta} f) .

See also

• Equivalent input noise
• Effective input noise temperature