Title :
Design of Balanced RF Filter for Wireless Applications Using FBAR Technology
Author :
Jin, Hao ; Dong, Shurong ; Wang, Demiao
Author_Institution :
Dept. of Inf. Sci. & Electron. Eng., Zhejiang Univ., Hangzhou
Abstract :
We present a balanced RF filter based on thin film bulk acoustic resonator (FBAR) technology for wireless applications, and demonstrate its usage in the wide-band code division multiple access (WCDMA) front-end as post-LNA filter. The filter, which consists of two lattice sections and one symmetric ladder section, provides deep rejection at stop-band, particularly at transmitter band (1920-1980 MHz), steep roll-off at pass-band edges, and excellent common mode rejection ratio (CMRR). The typical broadband rejection is better than 60 dB. The small size, low in-band insertion loss, sharp roll-off, high stop-band rejection, good temperature stability, and compatibility with semiconductor processing make this FBAR filter an ideal choice for GHz wireless applications
Keywords :
UHF filters; acoustic resonator filters; bulk acoustic wave devices; code division multiple access; 1920 to 1980 MHz; FBAR filter; FBAR technology; balanced RF filter; broadband rejection; common mode rejection ratio; insertion loss; post-LNA filter; sharp roll-off; stop-band rejection; temperature stability; thin film bulk acoustic resonator; wide-band code division multiple access; wireless applications; Acoustic applications; Band pass filters; Film bulk acoustic resonators; Lattices; Multiaccess communication; Radio frequency; Resonator filters; Transistors; Transmitters; Wideband;
Conference_Titel :
Electron Devices and Solid-State Circuits, 2005 IEEE Conference on
Conference_Location :
Howloon, Hong Kong
Print_ISBN :
0-7803-9339-2
DOI :
10.1109/EDSSC.2005.1635205
