The functions of the AFE module are including filters, AGC and TX/RX switch.

前端模拟模块的功能主要包括滤波 器、自动 增益控制（AGC）和收发转换 器。

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Then, the analysis in theory and the designing method of the key parts in the system, such as SPDT switch, LNA, AGC and filter, is carried out. Finally, the function of each part is tested.

然后对其系统中的关键组成部分，SPDT开关、LNA、AGC、滤波器进行了理论和设计方法上的分析，最后对其各部分进行了实验和测试。

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