![]() ![]() The process of optimizing PCB trace width must meet two objectives: You can figure out the best trace width to use in your board if you reframe your PCB trace width calculation as an optimization problem. ![]() While ringing and crosstalk cannot be completely eliminated in a perfectly impedance matched transmission line, they can be reduced to the point where they does not cause overshoot or undershoot in the signal level or put a signal in the receiver’s undefined region. However, changing the trace width also changes the impedance of your trace. This is true to an extent making your traces wider will reduce ringing and crosstalk as it reduces the inductance in a trace. It is often said that one solution to reducing transient ringing in a PCB trace is to simply use wider traces. This can be difficult if you’re using guesswork to determine the appropriate trace dimensions and you’re trying to comply with IPC 2152 standards. As I’ve pointed out in a previous article on transmission line design and controlled impedance routing, one important aspect of transmission line design is to ensure your signals do not have significant ringing or susceptibility to crosstalk. ![]()
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