Title:
薄膜音響結合変成器におけるインピーダンス変換比の制御
Document Type and Number:
Japanese Patent JP4701183
Kind Code:
B2
Abstract:
One embodiment of the acoustically-coupled transformer includes a stacked bulk acoustic resonator (SBAR) having a stacked pair of film bulk acoustic resonators (FBARs) with an acoustic decoupler (230,270) between them. Each FBAR has opposed planar electrodes (212,214,222,224) with piezoelectric material between them. The transformer additionally has first terminals electrically connected to the electrodes of one FBAR and second terminals electrically connected to the electrodes of the other FBAR. Another embodiment includes first and second stacked bulk acoustic resonators (SBARs) (206,208), each as described above, a first electrical circuit (247) connecting one FBARs of the first SBAR to one FBAR of the second SBAR, and a second electrical circuit (248) connecting the other FBAR of the first SBAR to the other FBAR of the second SBAR. The transformer provides impedance transformation, can link single-ended circuitry with balanced circuitry or vice versa and electrically isolates primary and secondary. Some embodiments are additionally electrically balanced.
Inventors:
Larson, John, Dee, The Third
Ellis, Stephane, Elle
Sir Sik, Name
Ellis, Stephane, Elle
Sir Sik, Name
Application Number:
JP2006538279A
Publication Date:
June 15, 2011
Filing Date:
October 29, 2004
Export Citation:
Assignee:
Avago Technologies Wireless IP (Singapore) Private Limited
International Classes:
H03H9/17; H03H9/54; H01L41/09; H01L41/18; H03H9/13; H03H9/60
Domestic Patent References:
| JP2003505905A |
Foreign References:
| US20030128081 | ||||
| WO2003030358A1 | ||||
| WO2003050950A1 |
Other References:
K.M.Lakin,Bulk Acoustic Wave Coupled Resonator Filters,Proceedings of the 2002 IEEE International Frequency Control Symposiun,米国,2002年,p8-14
Attorney, Agent or Firm:
Satoshi Furuya
Takahiko Mizobe
Kiyoharu Nishiyama
Takahiko Mizobe
Kiyoharu Nishiyama