How to avoid ground loop interference in power line carrier PLCs?

To avoid ground loop interference in power line carrier PLCs, a comprehensive design approach is needed, addressing both the grounding system and signal transmission. First, the system should employ a single-point grounding architecture, converging all ground wires to the main grounding point to prevent ground loops. In signal transmission, differential transmission should be used, coupled with a low-capacitance ESD protection device, ESDLC5V0D8B, providing protection without affecting signal balance. For interfaces that must bridge different ground potentials, isolation solutions such as digital isolators should be used to cut off ground loop paths. In PCB design, analog ground, digital ground, and power ground should be separated and connected at a single point using a PBZ1608A-102Z0T ferrite bead. For long cable connections, shielded twisted-pair cables should be used, with the shield grounded at one end. These measures effectively eliminate common-mode interference caused by ground loops.