Your traces aren't square, but do you need to care?
Yes, you should care about the fact that PCB traces, when actually manufactured, end up having more of a trapezoidal shape. This is especially true when modeling those traces to determine the correct impedance. More important than the trapezoid shape itself is the resulting change in trace width. Typically, on 1/2-oz. copper, the etching process leaves the top of a trace about 0.5 mils narrower than … Read More
Tags: HyperLynx, impedance, correlation, trapezoidal traces, measurement, stackup