An Alternative Definition of the Equivalent Noise Temperature of Two Terminal Networks

Details An Alternative Definition of the Equivalent Noise Temperature of Two Terminal Networks An Alternative Definition of the Equivalent Noise Temperature of Two Terminal Networks

2001-10-15

arxiv.org/abs/cond-mat/0110290v2

Physics

Condensed Matter

Materials Science

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Scientific paper

A hypothetical test resistor is connected in parallel to a two terminal network. The temperature of the test resistor is tuned, until there is no net flow of noise energy between the network and the resistor. It is shown that this temperature is independent of the value of the resistor. It is therefore suggested that this temperature may serve as an alternative definition of the equivalent noise temperature of a two terminal network. Quite interestingly, this equivalent noise temperature of an ideal pn diode equals the actual temperatue of the diode. Furthermore, if this newly defined equivalent noise temperature can be estimated for a given network by physical arguments, than the noise of the network can be calculated provided its current voltage dependence is known. As an example, the suppression of shot noise due to recombination in the space charge region of a pn diode is estimated using this procedure.

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