PCB & Hardware
What is Controlled Impedance?
Controlled impedance is a PCB technique that sets precise trace geometry and stackup so high-speed signals see a consistent target impedance (often 50 Ω), preventing reflections and signal loss.
As data rates rise, traces behave like transmission lines. Matching impedance across the path keeps signals clean, and is fundamental to DDR memory, USB, PCIe, Ethernet, and RF designs.
Related terms
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