2026-08-25
What Is Impedance? Formula, Calculation & Controlled Impedance PCB Explained
A controlled-impedance PCB is designed so that selected signal paths maintain a defined characteristic impedance throughout the board. Proper impedance control helps reduce signal reflections, preserve signal integrity, and support reliable communication between components.
Impedance requirements are particularly important for interfaces and applications such as USB, Ethernet, PCIe, DDR, HDMI, LVDS, RF circuits, and other high-speed designs.