Title :
SAW FEMs for GSM-based multi-band cellular phones with direct-conversion demodulation
Author :
Hikita, M. ; Matsuura, N. ; Yokoyama, K. ; Shibagaki, N. ; Sakiyama, K.
Author_Institution :
Central Res. Lab, Hitachi Ltd., Japan
Abstract :
Assuming DC demodulation, the required characteristics and new configurations for SAW front-end modules (FEMs) were investigated. Parallel connections between SAW filters and the pin diode reduce the number of circuit elements drastically. The developed module for EGSM/DCS dual-band achieved Tx insertion losses as small as 1.0 dB and 1.2 dB, and Rx insertion losses of 3.0 dB and 3.3 dB for EGSM and DCS, respectively. 30-40 dB attenuation particularly required for DC demodulation up to several GHz was achieved. Multi-band FEMs such as triple-band FEMs and so on were also investigated.
Keywords :
cellular radio; demodulation; p-i-n diodes; radio receivers; radio transmitters; surface acoustic wave filters; transceivers; 1 dB; 1.2 dB; 3 dB; 3.3 dB; DCS; EGSM; EGSM/DCS dual-band module; GSM-based multi-band cellular phones; SAW FEMs; SAW filter parallel connections; SAW resonators; antenna duplexers; attenuation; circuit elements; direct-conversion demodulation; direct-conversion transceiver; multi-band FEMs; pin diode; receiver insertion losses; surface acoustic wave front end modules; transmitter insertion losses; triple-band FEMs; Cellular phones; Circuits; Demodulation; Distributed control; Dual band; Insertion loss; SAW filters; Surface acoustic waves; Switches; Transceivers;
Conference_Titel :
Microwave Symposium Digest, 2002 IEEE MTT-S International
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-7803-7239-5
DOI :
10.1109/MWSYM.2002.1012136
