PCB Impedance Calculation and Cross Section Features in PCB Layout
PCB Design EngineersWhen I first started laying out printed circuit boards, there wasn’t a lot of concern about controlled impedance routing. At that time, most everything was low speed and we were using larger traces and thru-hole vias for the simple four layer boards. That all changes once a board grows in speed, and changes demanded that we become more involved with the layer stackup design and specifying trace widths. At first we relied on board constraint...