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IEVref:702-08-52ID:
Language:enStatus: Standard
Term: (equivalent) noise resistance (of a one-port device)
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Symbol: Req
Definition: quantity Req, having the dimensions of resistance, used to express the equivalent noise voltage En of a one port device through the relationship:

R eq = E n 2 4k T 0 Δf MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbbjxAHXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeqabiGaciGacaqadmaadaqaaqaaaOqaaiaadkfadaWgaaWcbaGaaeyzaiaabghaaeqaaOGaeyypa0ZaaSaaaeaacaWGfbWaa0baaSqaaiaab6gaaeaacaaIYaaaaaGcbaGaaGinaiaaykW7caWGRbGaaGPaVlaadsfadaWgaaWcbaGaaGimaaqabaGccaqGuoGaaGPaVJqaciaa=zgaaaaaaa@461E@

where T0 is a reference thermodynamic temperature, fixed by convention around 290 K, Δf is the bandwidth considered and k is Boltzmann's constant

NOTE – A receiving antenna can be regarded as a one-port device when viewed from its output port.


Publication date:1992-03
Source:
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Internal notes:2015-12-04: <i>T</i><sub>o</sub> corrected to <i>T</i><sub>0</sub>. JGO

2017-06-02: Cleanup - Remove Attached Image 702-08-52.gif
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