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.