PCB Design - Advanced Routing Techniques
A designer tries to reduce EMI by increasing the spacing between power and ground planes but notices EMI increased. What is the likely cause?
A designer tries to reduce EMI by increasing the spacing between power and ground planes but notices EMI increased. What is the likely cause?
medium📝 Formula Fix Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze effect of spacing between planes
Increasing spacing increases loop area for return currents, which increases EMI radiation.Step 2: Connect loop area to EMI
Larger loop area acts like an antenna, increasing EMI emissions.Final Answer:
Increased loop area causing more radiated EMI -> Option DQuick Check:
More spacing = bigger loop area = more EMI [OK]
Quick Trick: Keep power and ground planes close to minimize loop area [OK]
Common Mistakes:
MISTAKES- Assuming more spacing reduces EMI
- Confusing impedance with loop area
- Ignoring return current paths
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