An Electronically Tunable Bandpass BAW-Filter for a Zero-IF WCDMA Receiver

Author

Razafimandimby, Stéphane ; Tilhac, Cyrille ; Cathelin, Andreia ; Kaiser, Andreas ; Belot, Didier

Author_Institution

STMicroelectron., Crolles

fYear

2006

fDate

Sept. 2006

Firstpage

142

Lastpage

145

Abstract

This paper presents for the first time an integrated tunable RF filter using bulk acoustic wave (BAW) resonators designed to be used in a zero-lF W-CDMA receiver between the LNA and the mixer. The presented filter offers a reduced sensitivity to process and temperature variations thanks to its tunability. The tuning is achieved through additional passive components (Q-enhanced inductors and varicaps). Measurements confirm that the prototype filter permits to correct a 0.6% error on the BAW piezoelectric layer thickness. It consumes 7 mW for a 2.14 GHz center frequency in a 0.25 mum SiGe:C BiCMOS process. Good in-band linearity and noise performances have also been obtained

Keywords

BiCMOS integrated circuits; Ge-Si alloys; UHF filters; band-pass filters; bulk acoustic wave devices; carbon; circuit tuning; code division multiple access; inductors; low noise amplifiers; mixers (circuits); radio receivers; surface acoustic wave resonator filters; varactors; 0.25 micron; 2.14 GHz; 7 mW; BAW filter; BAW piezoelectric layer thickness; BAW resonators; LNA; Q-enhanced inductors; RF filter; SiGe:C; SiGe:C BiCMOS process; bulk acoustic wave resonators; electronically tunable bandpass filter; mixer; passive components; varicaps; zero-IF WCDMA receiver; Acoustic measurements; Acoustic waves; Band pass filters; Inductors; Multiaccess communication; Radio frequency; Resonator filters; Temperature sensors; Thickness measurement; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2006. ESSCIRC 2006. Proceedings of the 32nd European

Conference_Location

Montreux

ISSN

1930-8833

Print_ISBN

1-4244-0303-0

Type

conf

DOI

10.1109/ESSCIR.2006.307551

Filename

4099724