Via Modeling

摘要

The via is more important to your interconnect arsenal than ever. PCB designers have to deal with high pin-count devices and shrinking PCB real estate, making use of the via almost mandatory. However, the through-hole via can have a significant impact on high-speed digital design. Historically, at slower signaling speeds, vias were basically ignored by digital designers and treated as just another form of connection in the Z direction. Copper traces on signal layers acted as the horizontal wires and drilled holes, which where subsequently plated, acted as the wires in the vertical direction. Today, as signaling speeds move into the hundreds of megahertz and past 1 gigahertz, vias can no longer be ignored.