Reverse Engineering PCB Board Current Loop Design

Reverse Engineering PCB Board Current Loop Design with or without ground plane, for the current loop, you need to pay attention to the following basic matters:

If you use traces, make them as thick as possible.
If printed circuit board reverse rerouting is to be considered for the ground connection on the PCB, the PCB board layout redesign should make the wiring as thick as possible.

This is a good rule of thumb, but you should know that the minimum width of the ground wire is the effective width from this point to the end, where the “end” refers to the point farthest from the power connection.

Ground loops should be avoided.

If the ground plane cannot be used, a star connection strategy should be used (see above image). In this way, the ground current independently returns to the power connection. In above Figure, notice that not all devices have their own loops, U1 and U2 share loops.