Case Study: How Fixing a Single Ground Plane Error Saved a Hardware Launch

 

High-resolution 4-layer PCB design layout with microcontroller and decoupling capacitors for hardware troubleshooting

The Problem

A client approached us with a custom industrial controller board suffering from random microcontroller resets during field operation. Two previous PCB layout revisions had failed to resolve the issue, leading to costly product delays and field failures.

​The Diagnosis

Upon conducting a thorough hardware troubleshooting and design review in KiCad, we identified two critical signal integrity flaws:

  • ​A split ground plane beneath high-speed signal traces was forcing return currents to take a long, inductive path, creating severe EMI/EMC issues and ground bounce.
  • ​Poor decoupling capacitor placement—located too far from the microcontroller's VCC pins—caused voltage dips during sudden switching loads.

​The Solution

We redesigned the 4-layer PCB stackup to implement a continuous, solid ground plane with proper stitching vias. Additionally, we relocated the decoupling capacitors directly adjacent to the IC power pins to minimize loop inductance.

​The Result

Following the PCB redesign, the board passed all stress and EMI tests with zero microcontroller resets, restoring complete reliability for mass production.

​Facing similar hardware or PCB layout challenges?

Get in touch with us today for a professional PCB design review or custom electronics engineering consultation.


Connect with me directly:

Comments

Post a Comment