SAW front-end module for GSM-based dual-band cellular phones with direct-conversion demodulation

被引：11
作者：
Hikita, M [1 ]
Matsuura, N
Yokoyama, K
Shibagaki, N
Sakiyama, K
机构：
[1] Hitachi Ltd, Cent Res Lab, Tokyo 1858601, Japan
[2] Hitachi Media Elect Ltd, Kanagawa 2440817, Japan
来源：
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2002年 / 50卷 / 11期
关键词：
direct conversion (DC); dual band; front-end; global system for mobile communication (GSM); surface acoustic wave (SAW); SAW filter;
D O I：
10.1109/TMTT.2002.804516
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Assuming direct-conversion (DC) demodulation, the required characteristics for surface-acoustic-wave (SAW) front-end modules (FEMs) have been investigated. A new FEM configuration is described that consists of not only transmitter (Tx) switching p-i-n diodes and a diplexer with low-pass/high-pass filters, but also SAW filters and baluns. A direct parallel connection between a SAW filter and a p-i-n diode makes it possible to drastically reduce the number of circuit elements. A module developed for an extended global system for mobile communications (EGSM)/digital cellular system (DCS) dual-band cellular-phone transceiver achieved insertion losses in the receiver (Rx) portions as small as 3.0 and 3.3 dB for EGSM and DCS, respectively. The Rx portions had attenuation characteristics as high as 3040 dB at harmonic frequencies up to several gigahertz and complete differential output signals with amplitude and phase imbalances less than +/-0.5 dB and +/-4degrees, respectively. These characteristics are particularly required for DC demodulation. Small insertion losses in the Tx portions, 1.0 and 1.2 dB for EGSM and DCS, respectively, were also obtained.
引用
收藏
页码：2629 / 2638
页数：10
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