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

Author

Boglione, Luciano ; Pollard, Roger D. ; Postoyalko, Vasil

Author_Institution

Dept. of Electron. & Electr. Eng., Leeds Univ., UK

Volume

45

Issue

2

fYear

1997

fDate

2/1/1997 12:00:00 AM

Firstpage

301

Lastpage

304

Abstract

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 R_n, g _n, and ρ_n are given as functions of the feedback for a given network. It is proved that R_n always reaches a minimum when a reactive series feedback is considered. The same results are demonstrated for g_n 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

Keywords

active networks; circuit feedback; circuit noise; linear network analysis; microwave circuits; passive networks; two-port networks; active network; duality principle; linear microwave networks; noise conductance; noise parameters; noise resistance; noisy feedback immittances; parallel feedback; passive network; series feedback; two-port network; Circuit noise; Coaxial components; Convergence; Dielectrics; Equations; Feedback amplifiers; Feeds; Microwave amplifiers; Microwave theory and techniques; Waveguide components;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.557617

Filename

557617