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Why does increasing the length of parallel routing between two signal traces increase crosstalk?

hard🧠 Conceptual Q10 of 15
PCB Design - Advanced Routing Techniques
Why does increasing the length of parallel routing between two signal traces increase crosstalk?
ALonger runs decrease trace resistance
BLonger runs reduce signal frequency
CLonger parallel runs increase electromagnetic coupling duration
DLonger runs improve signal isolation
Step-by-Step Solution
Solution:

  1. Step 1: Understand parallel routing effect

    Longer parallel traces allow more time for signals to couple electromagnetically.

  2. Step 2: Impact on crosstalk

    This increased coupling duration raises crosstalk levels.

  3. Final Answer:

    Longer parallel runs increase electromagnetic coupling duration -> Option C

  4. Quick Check:

    Longer parallel = More crosstalk [OK]
Quick Trick: Long parallel traces cause more interference [OK]
Common Mistakes:
MISTAKES
  • Thinking longer runs reduce crosstalk
  • Confusing frequency effects
  • Ignoring coupling duration

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