The CC2545EM reference design contains schematics and layout files for the CC2545EM module. The reference design demonstrates good techniques for CC2545 decoupling and RF layout. For optimum RF performance, the reference design should be copied accurately. This is a 4-layer reference design with an inverted F PCB antenna and an SMA antenna connector for RF output matched to 50 ohm. The two antenna options are selectable by moving a 0 ohm resistor.