Many of the formulas we use for PCB impedancecalculations are readily available, but not all of them. Infact, while we are often quick to say that PCBs begin tolook like transmission lines when rise times are fast enough,and perhaps toss out a few formulas for our readers, wemiss at least three factors when we do so.Not complete: It's not enough to say that Zo equalssome complex formula. We may also want to know otherparameters, such as propagation time, intrinsic capacitance,intrinsic inductance, and the effects of device loading andterminations. I know of no single source where all of these formulas are made available.
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