PCB Board Reverse Engineering often use protective ground wires for isolation to suppress mutual interference between signals. Indeed, the protective ground wire can sometimes improve the isolation between signals, but the protective ground wire is not always effective, and sometimes even worsens the interference.
The use of the protective ground wire must be carefully analyzed in the cloned PCB gerber file, according to the actual situation and handled carefully. The protective ground wire refers to inserting a GND wire between two signal wires to isolate the two signals. Both ends of the ground wire are connected to the GND plane with GND vias, as shown in below figure. Sometimes a protective ground wire is placed on both sides of the sensitive signal.
Protective Ground Wire in the PCB Board Reverse Engineering
If you want to add a protective ground wire, you must first extend the distance between the two signal lines when layout PCB board drawing enough to accommodate a space for a protective ground wire. Since the distance between the signal wires is opened, even if the protective ground wire is not inserted, the cross-talk will be reduced.
