Ten Most-Important EMC Problems/Issues and How to Correct Them:
8. Poor Signal Returns

A frequent situation with cables, as well as pin-out designs in ASICs or other LSI devices is lack of adequate signal return wires (or pins) .

Unless the return-path impedance is zero, a bit of current will often return on a stray path, creating large loop currents.

Solutions:

• Route power and signals in separate cables
• Use shielded cables
• A dd more ground return pins to ASIC/FPGA definitions
• (50/50% is ideal)