Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-05-18
Physics
Condensed Matter
Statistical Mechanics
12 pages, 5 figures, to appear in Fluctuation and Noise Letters
Scientific paper
A Langevin approach to understand the noise of microwave devices is presented. The device is represented by its equivalent circuit with the internal noise sources included as stochastic processes. From the circuit network analysis, a stochastic integral equation for the output voltage is derived and from its power spectrum the noise figure as a function of the operating frequency is obtained. The theoretical results have been compared with experimental data obtained by the characterization of an HEMT transistor series (NE20283A, by NEC) from 6 to 18 GHz at a low noise bias point. The reported procedure exhibits good accuracy, within the typical uncertainty range of any experimental determination. The approach allows to extract all the information required for understanding the noise performance of the device without any restriction on the statistics of the noise sources. The results show the relevant noise phenomena from a new angle.
Caddemi A.
Ferrante G.
Principato F.
Spagnolo Bernardo
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