Im currently working on a PCB design, where I will have 6 layers
The stackup will be:
- Top signals
- GND layer
- Signal 3
- Signal 4
- Bottom signal
Right now I have an full Ground plane on layer 2, but should i also use copper fill connected to GND on the other 5 layers to shorten the GND return path as much as possible?
The design is filled with digital sensors sampling at a 1MHz or 2. - Only impedance that is important is my wire to the wifi antenna, which of course will follow the rules to get 50 Ohm impedance.