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Given a PCB layout with a long parallel trace running next to a high-frequency signal, what is the likely effect on EMI?

medium📝 Formula Result Q13 of 15
PCB Design - Advanced Routing Techniques
Given a PCB layout with a long parallel trace running next to a high-frequency signal, what is the likely effect on EMI?
AEMI will increase due to coupling between traces
BEMI will decrease due to longer trace length
CEMI will remain unchanged
DEMI will be eliminated by parallel routing
Step-by-Step Solution
Solution:

  1. Step 1: Analyze trace coupling effect

    Long parallel traces near high-frequency signals increase capacitive and inductive coupling, raising EMI.

  2. Step 2: Understand EMI behavior in PCB layout

    Parallel routing without spacing or shielding increases noise interference, not reduces it.

  3. Final Answer:

    EMI will increase due to coupling between traces -> Option A

  4. Quick Check:

    Parallel traces increase EMI coupling [OK]
Quick Trick: Parallel traces increase EMI coupling [OK]
Common Mistakes:
MISTAKES
  • Assuming longer traces reduce EMI
  • Thinking EMI stays same without shielding
  • Believing parallel routing eliminates EMI

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