PCB Design - Advanced Routing Techniques
During PCB review, a guard trace is found connected to a noisy power net instead of ground. What is the expected problem?
During PCB review, a guard trace is found connected to a noisy power net instead of ground. What is the expected problem?
medium🧠 Conceptual Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Identify guard trace connection error
Connecting guard traces to noisy power nets introduces noise instead of shielding.Step 2: Understand impact on sensitive signals
Noise from power net couples into the sensitive signal, degrading quality.Final Answer:
The guard trace will inject noise into the sensitive signal -> Option AQuick Check:
Guard trace on power net injects noise = B [OK]
Quick Trick: Guard traces must connect to clean ground, not power nets [OK]
Common Mistakes:
MISTAKES- Assuming guard traces shield when connected to power
- Thinking guard traces have no effect
- Believing guard traces improve power
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