Title :
Investigation of merged Rx-differential output for multi-band saw front-end module
Author :
Hikita, Mitsutaka ; Shibagaki, Nobuhiko ; Yokoyama, Kazuyuki ; Matsuda, Shigeki ; Matsuura, Naoki ; Hikino, Osamu
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
Abstract :
A quad-band SAW FEM used together with conventional triple-band RFICs was developed. To reduce number of Rx output ports of the FEM, we examined several types of merging methods for GSM850 and EGSM, and showed the feature comparisons among them. RFICs with direct-conversion demodulation circuits require not only differential Rx-output ports from the FEM but also very accurate balanced characteristics especially when demodulating 3π/8-rotated-8PSK signals used in the future EDGE system. We also proposed new wideband and accurate balun circuits for merged Rx-differential output ports to achieve required characteristics. Investigated and experimental results for the new FEM are presented.
Keywords :
cellular radio; demodulation; phase shift keying; radiofrequency integrated circuits; surface acoustic wave filters; PSK signals; Rx differential output; Rx output ports; balun circuits; direct conversion demodulation circuits; extended GSM; global system for mobile communication; multiband saw front-end module; phase shift keying signals; quadband SAW; radiofrequency integrated circuits; surface acoustic waves; triple band RFICs; wideband circuits; Cellular phones; Demodulation; Distributed control; Frequency; GSM; Merging; Radiofrequency integrated circuits; SAW filters; Surface acoustic waves; Switches;
Conference_Titel :
Ultrasonics, 2003 IEEE Symposium on
Print_ISBN :
0-7803-7922-5
DOI :
10.1109/ULTSYM.2003.1293430
