This can be accomplished by connecting the analog ground plane alone to the system ground connection, or by placing the analog circuitry at the farthest end of the board, at the end of the line. This is done to keep external interference to the signal path to a minimum. This is not necessary for digital circuits, which can tolerate a lot of noise on the ground plane without problems.

Heat dissipation considerations During the layout process, it is necessary to consider heat dissipation air ducts and heat dissipation dead corners; heat sensitive devices should not be placed behind the heat source air. Priority is given to the layout position of users with difficult heat dissipation such as DDR. Avoid repeated adjustments due to failure of thermal simulation.