Equivalent noise resistance
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In telecommunication, an equivalent noise resistance is a quantitative representation in resistance units of the spectral density of a noise-voltage generator, given by <math>R_n = \frac {\pi W_n}{k T_0} <math> where <math>W_n<math> is the spectral density, <math>k<math> is the Boltzmann's constant, <math>T_0<math> is the standard noise temperature (290 K), so <math>kT_0 = 4.00 \times 10^{-21}\,[Ws]<math>.
Note: The equivalent noise resistance in terms of the mean-square noise-generator voltage, <math>e^2<math>, within a frequency increment,<math>\Delta f<math>, is given by <math>R_n = \frac{e^2}{4 k T_0\Delta f}<math>.
Source: from Federal Standard 1037C