When the size of the PCB is too large, the anti-interference ability of the system declines due to the increase of the alignment, and the cost increases. However, the size of the PCB tends to cause problems of heat dissipation and mutual interference.
Second, and then determine the location of special components.
Such as clock components, the best clock alignment around the floor and do not walk in the key signal line up and down, to avoid interference.
Third, based on the circuit functions, the layout of the PCB as a whole.
In the component layout, the relevant components as close as possible, so you can get a better anti-jamming effect.