I am designing a 4 layers PCB with the following stack-up:
- Signal flooded with GND
- Solid GND plane
- POWER plane
- Signal flooded with GND
For the top Layer I want to divide the GND plane (flooded) into 3 parts and connect them to the solid GND plane through vias.
Can this decrease the noise from the digital circuits (digital sensors) and the power supply that can affect the analog circuit? {J6, J13 } (ADC + PASSIVE FILTER)
Would it be better to connect all the GND pads to the solid GND plane directly or should I split the ground plane?