# High current in the presence of high frequency digital logic circuits

I'm in the process of designing an ARM single-board computer that would also have high current (18A) running through the same board. Think of a BeagleBoard, but powered by a 6V/2800mAh battery. So the raw battery voltage at a possible peak current of 18A is fed to motor outputs, and about 1-2A is fed through a 5V regulator to the logic part of the board.

How close could I route the high-current traces to the logic traces? Would these high-current traces need to be on their own layer? What other design/layout considerations would I need to take into account for something like this?

• 18A isn't the problem (unless your tracks are too thin). The problem is how is the 18A changing - changes in current (${di}/{dt}$) induce voltages into other tracks. Jul 30 '13 at 7:52