PCB Design - Advanced Routing Techniques
Given a high-speed signal routed with a 50-ohm controlled impedance trace, what happens if the trace width is increased without adjusting the dielectric thickness?
Given a high-speed signal routed with a 50-ohm controlled impedance trace, what happens if the trace width is increased without adjusting the dielectric thickness?
medium📝 Formula Result Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand impedance relation to trace width
Increasing trace width lowers the impedance because wider traces have less resistance and capacitance changes.Step 2: Identify effect on signal
Lower impedance than target causes mismatch, leading to signal reflections and degraded quality.Final Answer:
The impedance decreases, potentially causing signal reflections -> Option BQuick Check:
Increasing width without dielectric change = Lower impedance [OK]
Quick Trick: Wider trace lowers impedance, causing reflections if unmatched [OK]
Common Mistakes:
MISTAKES- Assuming impedance increases with width
- Thinking impedance stays the same
- Believing trace becomes noise immune
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