A monolithic SiGe 5 GHz low noise amplifier and tuneable image-reject filter for wireless LAN applications

Author

Foley, Brendan ; Murphy, Patrick ; Murphy, Aidan

Author_Institution

Dept. of Electr. & Electron. Eng., Univ. Coll. Cork, Ireland

fYear

2000

fDate

2000

Firstpage

26

Lastpage

31

Abstract

This paper presents a monolithic RFIC consisting of a low noise amplifier (LNA) and tuneable image-reject filter (IRF), for wireless local area network applications at 5 GHz. The LNA uses a cascode topology with on-chip matching to provide a simultaneous noise and power match The tuneable third-order filter alters the transfer characteristic of this LNA to achieve filtering of the image signal. The filter is varactor tuned using an external voltage source. The LNA and IRF are designed for operation between 5.15-5.35 GHz, targeted at the lower two bands of the recently allocated unlicensed national information infrastructure (U-NII) frequency bands. The circuit reported here makes use of Motorola´s silicon-germanium process technologies

Keywords

Ge-Si alloys; MMIC amplifiers; band-stop filters; bipolar MMIC; circuit tuning; integrated circuit design; microwave filters; passive filters; poles and zeros; semiconductor materials; varactors; wireless LAN; 5 to 5.35 GHz; Motorola SiGe process technologies; SiGe; U-NII frequency bands; cascode topology; front-end architecture; low noise amplifier; monolithic SiGe LNA; onchip matching; third-order filter; transfer characteristic; tuneable image-reject filter; varactor tuning; wireless LAN applications; wireless local area network; Filtering; Germanium silicon alloys; Low-noise amplifiers; Matched filters; Network topology; Radiofrequency integrated circuits; Silicon germanium; Tunable circuits and devices; Varactors; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

High Frequency Postgraduate Student Colloquium, 2000

Conference_Location

Dublin

Print_ISBN

0-7803-6590-9

Type

conf

DOI

10.1109/HFPSC.2000.874077

Filename

874077