I'm trying to understand how signals flows in the GND layer.
Let's assume that I have 4 layers PCB:
The CPU connect to the GND layer with VIA and I want to know, how the CPU return current will flow to the "Negative Terminal"?
I read that the return current in the GND layer flow below it signal, so the current flow directly from the via to the negative terminal in the shortest way?
Or does it flow below the VCC trace (in RED) and from there to the negative terminal?
About the VCC layer: I once told that the VCC layer can act like a GND layer with every thing related to return current.
I don't understand how this is possible for current to return via VCC layer?