GSM是Global System for Mobile Communication 的缩写。意思是全球移动通信系统。分GSM900、DCS1800和PCN1900三个频段,一般的所谓的双频手机就是在GSM900和DCS1800频段切换的手机。PCN1900则是别的一些国家使用的频段(如美国)。 GSM900/1800分别是工作在890~960mhz/1710~1880mhz频段的。GSM900的手机最大功率是8W(实际中移动台没这么大的功率,一般的手机最大功率是2W,车载台功能大), 而DC
The RF7168 is a dual band (EGSM900/DCS1800) GSM/GPRS Class 12 compliant transmit module with two symmetrical receive ports. This transmit module builds upon RFMD’s leading power amplifier with PowerStar® integrated power control technology, pHEMT sw
mt6139 is a highly-integrated RF transceiver IC for the Global Systems for Mobile Communication (GSM850/GSM900), Digital Cellular Communication Systems (DCS1800), and Personal Communication Services (PCS1900) cellular systems. It includes four LNAs,