On a 4 layer stackup with signals routed on top/bottom; 2nd layer VCC powerplane; 3rd layer GND powerplane.
How should the VCC powerplane be layed out? Should it be surrounded with a few mm of GND pour like a moat(GND) surrounding an island(VCC)? I would like to stitch gnd vias all around the board so it seems the VCC layer may need some gnd aorund the edges.
Thanks, I am an amateur at layout and trying to do best emi/rf practices. Note; the board has a GSM module on it but most digital signals do not exceed 2Mhz. There are some analog audio signals and I going to trying to keep that gnd isolated.