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Why is via stitching considered a critical technique for maintaining low impedance in PCB ground planes?

hard🧠 Conceptual Q10 of 15
PCB Design - Multi-Layer PCB Design
Why is via stitching considered a critical technique for maintaining low impedance in PCB ground planes?
ABecause it increases the physical size of the PCB
BBecause it changes the copper thickness
CBecause it creates multiple parallel paths for current flow
DBecause it reduces the number of layers needed
Step-by-Step Solution
Solution:

  1. Step 1: Understand impedance in ground planes

    Low impedance means current can flow easily with minimal resistance or inductance.

  2. Step 2: Role of via stitching

    Via stitching creates many parallel paths, lowering overall impedance and improving grounding.

  3. Final Answer:

    Because it creates multiple parallel paths for current flow -> Option C

  4. Quick Check:

    Via stitching lowers impedance via parallel paths [OK]
Quick Trick: Parallel vias reduce impedance in ground planes [OK]
Common Mistakes:
MISTAKES
  • Confusing impedance with PCB size
  • Thinking via stitching reduces layers
  • Assuming copper thickness changes

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