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Analytical behavior of the noise resistance and the noise conductance for a network with parallel and series feedback

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3 Author(s)
Boglione, L. ; Dept. of Electron. & Electr. Eng., Leeds Univ., UK ; Pollard, Roger D. ; Postoyalko, V.

An analysis is presented of the changes of the noise parameters of a two-port network when noisy series and parallel feedback immittances are applied. Exact formulas for the noise parameters Rn, g n, and ρn are given as functions of the feedback for a given network. It is proved that Rn always reaches a minimum when a reactive series feedback is considered. The same results are demonstrated for gn since a duality principle is pointed out. The results are valid for a wide range of linear microwave two-port networks, either passive or active, and they are used to confirm the data from previously published work

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:45 ,  Issue: 2 )