| Definition: | amount by which at a given frequency the noise temperature of a one port device connected to the input of a given linear two port device would have to be increased, if the noise due to this two-port device was temporarily suppressed, in order to cause the noise power spectral density at the output frequency corresponding to input frequency, to be the same as that of the total noise of the one-port and the given two-port devices
NOTE 1 – This definition assumes that quantum phenomena are negligible.
NOTE 2 – The equivalent spot noise temperature of a two-port device is dependent on the impedance of the one-port device connected to its input.
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