cdma射频前端的智能集成

　　cdma射频前端的智能集成

　　本文的目的是提出一个高度集成的三频双模例（CDMA GPS射频前端解决方案）以三Avago的高度集成的RF模块。

　　今天的移动设备相当复杂，许多射频收音机包装成一个不断缩小的足迹。如何将更多的无线电组件打包成更小的空间？收缩单个无线电组件是显而易见的，而单个部件的集成是另一个。整合的原因已经有据可查了。除了实际节省空间外，还有改进的性能和简化的设计，从而更快地进入市场。如果这里有一个“圣杯”，它将是一个单独的即插即用模块，它包含了整个射频前端，用户可以直接进入他们的PC板。

　　这个“圣杯”的例子可以在Wi-Fi空间看到。今天，完整的双波段802.11 A，B，G，N Wi-Fi前端存在单模块尺寸4x6毫米的小。这些模块包含整个射频前端包括功率放大器（PA）、低噪声放大器（LNA），过滤器，和单个基片上的所有开关，这是一个真正的即插即用的射频和天线之间玩。这些模块的采用对于今年正在设计的下一代笔记本电脑尤其强劲。

　　Integration of CDMA and UMTS RF front ends in mobile handsets is not as advanced as Wi-Fi front ends yet. One of the reasons is that the content of the UMTS RF front end is still continually varying and is region-specific. The CDMA RF front end， however， is fairly standardized in North America as dual mode， tri-band PCS and Cell band plus GPS， and integrated module solutions have the potential to be widely implemented as in the Wi-Fi case.

　　The two main paths for RF integration are by-band （combining PA and duplexer of a single band） or by-technology （combined PA modules and combined filter modules）。 Both provide the benefits of saving space and simplifying design， but the by-technology approach can also provide performance improvements through pin map optimization. Of the two choices， integration by-technology has proven to be the more common solution in today’s phones. From the component supplier point of view， fewer suppliers actually have both technologies （PA + filter） in-house and lack the expertise to integrate them together. This article will demonstrate a tri-band CDMA RF front end solution using three highly integrated RF modules that take the place of seven discrete components.