问两个问题:1.有没有CC2538EM的参考pcb设计文件,不是pdf格式的 2. 看到论坛上 有说到 we will come out with an improved range extender in Q1-2014. This device, combined with CC2538, will give improved output power and sensitivity (better than -100 dBm) compared to CC2538+CC2591, 可以具体说一下这个是什么吗?谢谢!