noise temperature

In electronics, noise temperature is one way of expressing the level of available noise power introduced by a component or source. The power spectral density of the noise is expressed in terms of the temperature (in kelvins) that would produce that level of Johnson–Nyquist noise, thus:

where:

• is the power (in watts)
• is the total bandwidth (Hz) over which that noise power is measured
• is the Boltzmann constant (1.381×10^-23 J/K, joules per kelvin)
• is the noise temperature (K)