equivalent noise resistance

A quantitative representation in resistance units of the spectral density of a noise-voltage generator, given by R_n = (W_n)/(kT₀), where W_n is the spectral density, k is Boltzmann's constant, T₀ is the standard noise temperature (290 K), and kT₀ = 4.00 × 10^-21 watt-seconds. Note: The equivalent noise resistance in terms of the mean-square noise-generator voltage, e², within a frequency increment, f, is given by R_n = e²/(4kT₀f).