Therefore, let’s take a look at some of the options available and see if we can hone in on a PCB impedance control calculation method that is both accurate and practical. Yet, the importance of board impedance control mandates that we employ a reliable method that does yield acceptable results. This was true when designers primarily used Smith charts and continues to be so today. Explicitly determining or calculating impedances on a circuit board, however, poses a significant challenge. When designing PCBAs, in particular, high speed board design, determining the best impedance value is very important, as it provides control for trace parameter definition and board material selection. And we are still trying to finalize an exact solution for π. A common one that permeates through most scientific, mathematic, and engineering work is the Heisenberg uncertainty principle, which states that the position and speed of an object (including subatomic particles) cannot both be measured simultaneously. Even so, imponderables still remain and must be addressed when analyzing, designing, and building physical systems. Science and mathematics are indeed based on precision, or the ability to assign an accurate measurable value to items, actions, and events.
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