Power-plane resistance

摘要

I recently asked a group of 90 digital-board designers in Boston how many power-supply voltages were in their latest designs. Three, four, and five-voltage systems were quite common. The most was eight. The worst of the lot chopped the power plane into a profusion of ir- regular zones, just like a map of the Balkans. Computing the de-voltage drop across such a power-distribution network can be challenging.