A PCB stackup is arranged as Signal - Power - Ground - Signal. What is the main drawback of placing the power layer directly adjacent to the ground layer in this configuration?

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PCB Design - Multi-Layer PCB Design

AIt creates a high impedance path, increasing noise coupling.

BIt reduces the effectiveness of the power plane as a reference for signals.

CIt causes excessive heat dissipation in the power layer.

DIt increases the risk of signal crosstalk between the two signal layers.

Step-by-Step Solution

Solution:

Step 1: Identify layer adjacency
Power and ground layers are adjacent, which can affect reference planes.
Step 2: Understand signal referencing
Signal layers need a solid reference plane (usually ground) nearby for return currents.
Step 3: Analyze impact
Power layer next to ground reduces the ability of power to act as a stable reference, affecting signal integrity.
Final Answer:
It reduces the effectiveness of the power plane as a reference for signals. -> Option B
Quick Check:
Power adjacent to ground weakens power plane referencing [OK]

Quick Trick: Power layer next to ground reduces power plane reference quality [OK]

Common Mistakes:

MISTAKES

Confusing heat dissipation with layer arrangement
Assuming adjacency always improves signal integrity
Thinking crosstalk is caused by power-ground adjacency

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A PCB stackup is arranged as Signal - Power - Ground - Signal. What is the main drawback of placing the power layer directly adjacent to the ground layer in this configuration?

Step 1: Identify layer adjacency

Step 2: Understand signal referencing

Step 3: Analyze impact

Final Answer:

Quick Check:

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