The Johnson/Nyquist model of thermal noise (JN-model), describes the power transfer of a one-port network, but this description is free of inconsistency only externally. The internal energy balance depends on the values of the resistances and on whether a voltage or a current source is chosen. In other words, it depends on a purely subjective act. Thus this model cannot be considered to be final.

The well-tempered model of thermal noise fills the gaps in the JN model and offers a balanced energy economy, which is dependent on the temperature only. Both models, when observed externally, behave identically. Thus both of them are consistent with the Nyquist theorem and, in this usual situation, are interchangeable.

The well-tempered model is meaningful in all cases where, up until the present, thermal noise has been analytically registered and illustrated using the JN model. This is espe-cially timely for those studying it and for newer more fundamental research.

letzte Änderung: am 24.01.2005 um 19:13 Uhr von Christian de Schryver
© 2004-2010 by Prof. Dr.-Ing. Alexander Neidenoff - www.neidenoff.com