Rules to follow when doing PCB design
Ground loop rule: The minimum loop rule, that is, the area of ​​the ring formed by the signal line and its loop should be as small as possible. In response to this rule, when dividing the ground plane, the distribution of the ground plane and important signal traces should be considered to prevent problems caused by ground plane slots; in the double-layer board design, leave enough space for the power supply. In this case, the remaining part should be filled with the reference ground, and some necessary holes should be added to effectively connect the double-sided ground signals. For some key signals, try to isolate the ground wire as much as possible. Special consideration is given to the signal loop problem of its ground plane, and it is recommended to use a multi-layer board.