Title :
BAW/SAW/IPD hybrid type duplexer with Rx balanced output for WCDMA Band I
Author :
Nishihara, Tokihiro ; Iwaki, Masafumi ; Endo, Go ; Mi, Xiaoyu ; Taniguchi, Shinji ; Ueda, Masanori ; Satoh, Yoshio
Author_Institution :
FUJITSU LABORATORIES LTD., 64 Nishiwaki, Ohkubo-Cho, Akashi 674-8555, Japan
Abstract :
This paper describes a 3.0deg 2.5deg 0.7 mm3 wideband code division multiple access (WCDMA) Band I duplexer with receiver (Rx) balanced output we developed. The low-loss and power-durable film bulk acoustic resonator (FBAR) and the single-to-balanced double mode SAW (DMS) were utilized for the transmitter (Tx) and the Rx filter respectively. It was experimentally confirmed that the 2nd distortion of FBAR was significantly worse than that of the surface acoustic wave (SAW). In order to suppress the 2nd harmonic due to the nonlinear distortion of the duplexer and the power amplifier (PA), a notch circuit was implemented at the antenna port using our high-Q Integrated Passive Devices (IPD) technology. As a result, we realized the duplexer with suppressed nonlinear distortion as well as excellent filter response.
Keywords :
Q-factor; acoustic resonators; bulk acoustic wave devices; cellular radio; code division multiple access; nonlinear distortion; power amplifiers; radio receivers; radio transmitters; radiofrequency filters; surface acoustic wave devices; WCDMA band I; antenna port; bulk acoustic wave devices; cellular phones; double mode surface acoustic wave; film bulk acoustic resonator; high-Q devices; hybrid type duplexer; integrated passive devices; low-loss acoustic resonator; mobile communication systems; nonlinear distortion suppression; notch circuit; power amplifier; power-durable resonator; receiver balanced output; receiver filter; single-to-balanced surface acoustic wave; size 0.7 mm; size 2.5 mm; size 3.0 mm; surface acoustic wave devices; transmitter; wideband code division multiple access; Acoustic distortion; Film bulk acoustic resonators; Multiaccess communication; Nonlinear distortion; Power harmonic filters; Resonator filters; Surface acoustic wave devices; Surface acoustic waves; Transmitters; Wideband; 2nd distortion; 2nd harmonic; Band I; DMS; FBAR; IPD; WCDMA; duplexer; single-to-balanced;
Conference_Titel :
Microwave Symposium Digest, 2008 IEEE MTT-S International
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-1780-3
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2008.4632961
