Accurate Impedance Control

摘要

Impedance control is about accuracy. If one or two parameters are not carefully determined, we can lose the advantage of the more accurate parts of the process (for example, the usage of the expensive field solver programs). With simulators and calculators, we can determine trace width impedance (used for analysis) or impedance trace width (used for design). The calculations also depend on other parameters, but the role of width and impedance determines the usage. To get the best accuracy, perform full frequency-dependent impedance control. Even if we use the simplier and less expensive frequency independent design flow, it is worth it to understand the simplifications we make.