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)