I want to put in my PCB (two layers) an H-bridge motor drive that will control a high current motor (like several amps), that will be supplied by a separate power supply. Since it's a high current drive, special when it's turn on (there is a big current peak), I was wondering if it will impact the full circuit and if it is the case if it is safer to put that control section, including the ground, in a completely separated part.