Title :
GPS and WiFi single ended to differential CRF filters using SiOCH as a de-coupling layer
Author :
Ruby, Rich ; Gilbert, S.R. ; Chien, A. ; Jamneala, T.
Author_Institution :
Wireless Semicond. Div., Avago Technol., San Jose, CA, USA
Abstract :
Two filter applications, GPS and Wi-Fi, using bulk wave coupled resonator filters (BWCRF) are discussed. The device consists of two FBAR resonators stacked one on top of the other and separated by a thin de-coupling layer. We refer to this device as a De-Coupled Stacked Bulk Acoustic Resonator or DSBAR. These devices can be used as stand-alone filters or together with similar devices to create very small filters capable of single-ended to single-ended or single-ended to differential conversion. Also, due to the unique arrangement of the two FBAR one on top of the other, an impedance transformer can be made. Lastly, these devices have a very short ¿ring-down¿ time compared to ¿classic¿ FBAR filters, important for OFDM applications.
Keywords :
Global Positioning System; acoustic couplers; acoustic resonator filters; bulk acoustic wave devices; wireless LAN; BWCRF; DSBAR; FBAR resonators; GPS; OFDM applications; SiOCH; WiFi single ended to differential CRF filters; bulk wave coupled resonator filters; decoupling layer; impedance transformer; Acoustic devices; Costs; Film bulk acoustic resonators; Global Positioning System; Inductors; Mirrors; OFDM; Resonator filters; Shunt (electrical); Surface impedance;
Conference_Titel :
Ultrasonics Symposium (IUS), 2009 IEEE International
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4389-5
Electronic_ISBN :
1948-5719
DOI :
10.1109/ULTSYM.2009.5441456