Back Drilling & Controlled Depth Drilling

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Technical Documentation

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Technical Documentation Controlled Depth Drilling (Back Drilling) Controlled Depth Drilling (CDD), also known as back drilling, is a technique used to remove the unused portion, or stub, of copper barrel from a thru-hole in a printed circuit board. When a high-speed signal travels between PCB layers through a copper barrel, it can be distorted. If the signal layer usage results in a stub being present, and the stub is long, then that distortion can become…