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IEVref:702-08-57ID:
Language:enStatus: Standard
Term: spot noise factor, <of a linear two-port device>
Synonym1: spot noise figure, <of a linear two-port device>
[Preferred]
Synonym2:
Synonym3:
Symbol: F(f)
Definition: ratio of the available power spectral density of the noise appearing at a given frequency at the output of a given linear two-port device, to the spectral density which would be present at the output if the only source of noise were the thermal noise due to a one-port device connected to the input and which is assumed to have at all frequencies a spot noise temperature equal to the reference thermodynamic temperature fixed by convention at around 290 K

Note 1 to entry: The spot noise factor F(f) of a linear two-port device is related to the equivalent spot noise temperature T(f) as follows:

F( f )=1+ T( f ) T 0 MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbbjxAHXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeqabiGaciGacaqadmaadaqaaqaaaOqaaiaadAeadaqadaqaaiaadAgaaiaawIcacaGLPaaacqGH9aqpcaaIXaGaey4kaSYaaSaaaeaacaWGubWaaeWaaeaacaWGMbaacaGLOaGaayzkaaaabaGaamivamaaBaaaleaacaaIWaaabeaaaaaaaa@404B@

where T0 is the thermodynamic reference temperature.

Note 2 to entry: In English, the term “noise factor” is generally employed when the ratio is expressed arithmetically, and “noise figure” is employed when the ratio is expressed in decibels.


Publication date:2018-09
Source:
Replaces:702-08-57:1992-03
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