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noise temperature (Tn)
The uniform physical absolute temperature at which a network (and all its sources, if it is a multiport network) would have to be maintained if it (and its sources) were passive, in order to make available (or deliver) the same random noise power per unit bandwidth (spectral density) at a given frequency that is actually available (or delivered) from the network. (Ref. IEC 747‑1.)
References
JESD77-B, 2/00JESD99B, 5/07
RS-311-A, 11/81
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