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



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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)

Above: Make sure you have an adequate number and position of signal return pins

       
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Updated: Saturday, 2007-09-29 1:14 PST