Hi all. I'm working on an RF system including a 2.4G transceiver and a GPS receiver. I'll use a ground plane. What I intend to is to separate analog ground and digital ground and connect them together at the entry via a 0ohm resistor. My friend argues that a whole ground layer that connect to both analog and digital signals would work better than splited ground. It seems to me that digital noise will enter analog circuit more easily as the analog and digital pins are not separated into different parts on these chips. Could you give me some advice on this if you have such experience? Thanks.