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Minimize Ringing

Sparty's Favorite Recipes 016 Kiss Your ASIC Good-bye!
       

Instructions

How to prevent signal degradation due to reflections (ringing)

  • Keep the trace short (best solution, but often impossible).
  • Terminate at the destination (end termination).
    • Problem: High sink- or source current, or both. High power consumption.
    • Solution: capacitive coupling to the terminating resistor. Time constant should be longer than the transition, but much shorter than the flat time. Example: 200 pF x 50 Ohm = 10 ns.
  • Terminate at the source ( series termination).
    • Advantage: no static power consumption.
    • Problem: use only for single-destination. 50% amplitude along the trace.

 

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