Title :
Exact noise figure of a noisy two-port with feedback
Author :
Lam, V.M.T. ; Poole, C.R. ; Yip, P.C.L
Author_Institution :
Dept. of Electron. Eng., City Polytech. of Hong Kong, Kowloon, Hong Kong
fDate :
8/1/1992 12:00:00 AM
Abstract :
Exact expressions for the noise figure of a two-port with shunt or series feedback are presented in terms of standard four-noise parameters and imittance parameters. The general case of an arbitrary feedback network, characterised in terms of a two-port imittance matrix, is analysed and the results are applied to the more practical case of a single lossless feedback element. The results are presented in the form of the standard two-port noise figure equation, with additional terms which illustrate clearly the effect of feedback. The equations presented make use of directly measurable device parameters, and are therefore design-oriented
Keywords :
electric immittance; equivalent circuits; feedback; linear network analysis; matrix algebra; multiport networks; network parameters; noise; feedback network; imittance parameters; linear transport; noise figure; noisy two-port; series feedback; shunt feedback; single lossless feedback element; standard four-noise parameters; two-port imittance matrix;
Journal_Title :
Circuits, Devices and Systems, IEE Proceedings G
