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Ten Most-Important EMC Problems/Issues and How to Correct Them:
5. Stray Internal Coupling Paths and Data lines running under crystal oscillator



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Stray Internal Coupling Paths


Above: Stray capacitances between clip and connector can bypass on-board filters.

Solutions:

  • Adding external ferrite choke on I/O cable works well
  • Use a Faraday shield to disrupt coupling path

Data lines running under a crystal oscillator


Above: Data lines couple 100 MHz (and its harmonics) going through I/O connector to second PCB (printed circuit board) – which, in that area, is referenced to the power plane (with gaps).

       
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Updated: Saturday, 2007-09-29 0:38 PST