[Solved] A designer defines a four-layer stack-up as: Top Signal, Ground, Power, Bottom Signal.... What is the most likely error in the stack-up definition? | PCB Design

PCB Design - Multi-Layer PCB Design

A designer defines a four-layer stack-up as: Top Signal, Ground, Power, Bottom Signal. However, the PCB shows unexpected crosstalk on the top layer. What is the most likely error in the stack-up definition?

ATop signal layer is missing solder mask

BGround and power layers are swapped in the physical board

CBottom signal layer is incorrectly routed

DStack-up uses too many layers for the design

Step-by-Step Solution

Solution:

Step 1: Identify cause of crosstalk related to stack-up
Swapping ground and power layers changes return paths, increasing crosstalk.
Step 2: Confirm physical layer order matches definition
If ground and power are swapped physically, signals lose proper shielding causing noise.
Final Answer:
Ground and power layers are swapped in the physical board -> Option B
Quick Check:
Swapped ground/power layers cause crosstalk [OK]

Quick Trick: Verify physical layer order matches stack-up definition [OK]

Common Mistakes:

MISTAKES

Blaming solder mask for crosstalk
Assuming bottom layer routing causes top layer crosstalk
Thinking more layers always reduce crosstalk

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What is the most likely error in the stack-up definition?

Step 1: Identify cause of crosstalk related to stack-up

Step 2: Confirm physical layer order matches definition

Final Answer:

Quick Check:

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