This is the first time I am designing a 4 layer PCB. The circuit will work on multiple frequencies: Signal acquisition part works on few Hz to 200 Hz(max), but one portion of the circuit will generate 13.56MHz. Power supply is 3.3V from a Lipo battery. I am planning to stack the layers as follows:
I am using KiCad. I have already created ground plane and power plane. I have connected the negative terminal of battery to the ground plane by via. The schematic has a lot of ICs which require ground. I am just connecting those pads to the ground plane by vias too.
My question is: Do I have to route the connections in ground plane layer(all of them together, I mean do I have to connect them together again in ground plane-2nd layer of my PCB) or will the vias from the IC pads (supposed to be connected to ground as schematics) to ground plane will do? My understanding is, ground plane is full of copper unless I route any signal through them.