I'm combining 2 ground planes. Analog and Digital. What potential problems can happen?

[tdengineer]

AGND AND DGND

BOTH ARE FULL PLANES TAKING UP THE ENTIRE SPACE OF THE BOARD

COLORED OUTLINES ARE JUST WHERE COMPONENTS WILL CONNECT TO THEIR RESPECTIVE GND'S

TOP LEFT WHITE ARROW IS POINTING TO NET TIE'S CONNECTING ANALOG AND DIGITAL GROUND ONLY IN THAT AREA OF THE BOARD



The ic on the top left is my analog power supply stuff, the one on the top right is the digital supply stuff



electrode inputs and array on the left side of board GREEN

MCU connections , spi, digital stuff on right side of the board RED



LAYER 1 = SIGNALS

LAYER 2 = DGND

LAYER 3 = AGND

LAYER 4 = SIGNALS

 

[rossbalch]

I think it was this video that discussed digital and analogue ground design. At least a couple of his other mixed signal design videos have delved into this too I think

 

[rossbalch]

This was another good one maybe