The Role of Layered PCB Board Stacking in EMI Control
Modern EMI Suppression Methods
- EMI suppression coatings
- Selection of appropriate EMI suppression components
- EMI simulation in the design process
Power Bus and EMI Control
Proper placement of capacitors near IC power pins is crucial for controlling EMI. Ensuring a clean output involves addressing transient voltages and common-mode interference. The power plane around the IC acts as a high-frequency capacitor, capturing energy to maintain a clean output.
Control of Common-Mode EMI
Effective decoupling for common-mode EMI control requires a well-designed power plane with low inductance. The design factors include power supply layering, material between layers, and operating frequency.
Electromagnetic Shielding
Signal routing strategies involve placing all signal traces on layers adjacent to power or ground planes. Effective layering ensures minimal distance between power and ground layers.
PCB Board Stacking Strategies
Layer stacking schemes play a crucial role in shielding and reducing EMI. Different layer configurations, such as 4-layer, 6-layer, and 10-layer boards, offer varying degrees of EMI suppression performance and signal integrity.
Design of Multiple Power Layers
Dividing the board with insulating layers between pairs of power/ground planes ensures equal current division and uniform shunting. Balancing power and ground planes is essential for boards with multiple supply voltages.
Conclusion
Designing Printed Circuit Boards: Layering and Stacking Strategies
When it comes to designing conventional printed circuit boards, a thickness of 62 mils without blind/buried vias is the norm for most engineers. However, boards with varying thicknesses or advanced vias may call for customized approaches. The crux of effective layering lies in guaranteeing the bypass and decoupling of the power busbar, minimizing transient voltages, and shielding electromagnetic fields. By sticking to fundamental principles and concepts, you can craft a meticulously designed PCB that fulfills all your design criteria.
