Noise design of active feedback resonator BEF

Author

Ishikawa, Yozo ; Yamashita, Sadao ; Hidaka, Seiji

Author_Institution

Dept. of Microwave Components, Murata Manuf. Co. Ltd., Kyoto, Japan

Volume

41

Issue

12

fYear

1993

fDate

12/1/1993 12:00:00 AM

Firstpage

2133

Lastpage

2138

Abstract

It is shown that, in a filter design system which introduces noise temperature into the active feedback resonator (AFR), the AFR band elimination filter (BEF) can be designed using techniques for the conventional passive BEF. In this system, the passive BEF circuit used for electrical design is also useful for the noise analysis of the AFR BEF. This analysis reveals that the noise figure (NF) value of the AFR BEF can be calculated from the noise temperatures of AFRs. The optimum NF value is obtained by minimizing these noise temperatures. The noise design of a three-pole AFR BEF is discussed. It is found that the observed NF of the three-pole AFR BEF agrees well with the theoretical values deduced from the designed S-parameters and the observed noise temperatures of the AFRs

Keywords

active filters; band-stop filters; feedback; microwave filters; noise; resonators; S-parameters; active feedback resonator BEF; band elimination filter; electrical design; noise design; noise figure; noise temperature; three-pole filter; Active noise reduction; Band pass filters; Circuit noise; Feedback; Noise figure; Noise measurement; Passive filters; Resonator filters; Scattering parameters; Temperature;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.260697

Filename

260697