![]() As rise times increase, the resulting impedance becomes more noticeable. But to understand how and why, it’s important to understand a little bit about the nature of trace impedance.Įvery trace has a small, nearly indistinguishable series inductance distributed along the trace with an inverse relationship to the cross-section of the trace. While, usually, you must have a fairly fast rise time for your signals for trace impedance to become a problem, it’s important that you be aware that trace impedance exists and can become an issue.īut why do we need to worry about trace impedance? Why does it exist and is it possible to control it? If you’ve heard the term “controlled impedance,” you are probably already aware that it is possible to control impedance. All wires and traces will generate at least some impedance to current flowing from any driver. Impedance, unlike resistance, is based on frequency. Put an ohm meter over a trace and the DC resistance is almost negligible. In printed circuit boards, wires and traces are typically formed from copper because it is the least-resistant element apart from silver. ![]()
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