A broadband SiGe mixer for 5-GHz WLAN applications with X-band quadrature generation and high image-rejection

Author

Gruson, Rank ; Gaborit, Gwenael ; Abele, Peter ; Schumacher, Hermarln

Author_Institution

Dept. of Electron Devices & Circuits, Ulm Univ., Germany

fYear

2004

fDate

6-8 June 2004

Firstpage

523

Lastpage

526

Abstract

We report on the realization of an image-reject receiver that covers the various WLAN bands in Europe, Japan and the US, fabricated using a low-cost, 0.8 μm production-line SiGe-HBT process. A modified Gilbert mixer with a common-base input stage allows for a broadband RF operation from 2.5-6 GHz at a low supply voltage of 3 V. Broadband quadrature generation was achieved by using a fully integrated X-band VCO at 10 GHz in conjunction with a master-slave divider rather than using a polyphase filter or a quadrature VCO. While consuming less chip-area than competing solutions, we achieve an excellent image suppression of 40-45 dB without any post-tuning.

Keywords

Ge-Si alloys; MMIC frequency convertors; MMIC mixers; MMIC oscillators; bipolar MMIC; heterojunction bipolar transistors; integrated circuit design; integrated circuit measurement; radio receivers; semiconductor materials; voltage-controlled oscillators; wireless LAN; 0.8 micron; 10 GHz; 2.5 to 6 GHz; 3 V; 5 GHz; SiGe; SiGe-HBT process; WLAN applications; WLAN bands; X-band quadrature generation; broadband RF operation; broadband SiGe mixer; broadband quadrature generation; chip-area; common-base input stage; fully integrated X-band VCO; image suppression; image-reject receiver; image-rejection; master-slave divider; microwave bipolar transistor oscillators; microwave frequency conversion; microwave mixers; modified Gilbert mixer; supply voltage; Europe; Filters; Germanium silicon alloys; Image generation; Low voltage; Master-slave; Radio frequency; Silicon germanium; Voltage-controlled oscillators; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits (RFIC) Symposium, 2004. Digest of Papers. 2004 IEEE

ISSN

1529-2517

Print_ISBN

0-7803-8333-8

Type

conf

DOI

10.1109/RFIC.2004.1320673

Filename

1320673