Title :
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
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;
Conference_Titel :
Solid-State Circuits Conference, 2006. ESSCIRC 2006. Proceedings of the 32nd European
Conference_Location :
Montreux
Print_ISBN :
1-4244-0303-0
DOI :
10.1109/ESSCIR.2006.307551
