Why Power Planes Should Stay Small: A PCB Designer's Guide to Ground and Power

1. Introduction In the intricate world of Printed Circuit Board (PCB) design, every decision, from trace width to component placement, significantly impacts performance. Among the most fundamental yet often misunderstood aspects are power and ground planes. These aren't just large copper areas; they are critical elements that dictate a circuit's signal integrity, electromagnetic compatibility (EMC), and overall reliability. A common guideline you’ll encounter in advanced PCB design is that power