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Controlled impedance isn't a nice-to-have on high-speed digital, RF, or mixed-signal boards. It's a design requirement. When your traces carry signals with fast edge rates or operate at high frequencies, the relationship between trace geometry, dielectric properties, and characteristic impedance directly determines whether your signal arrives intact. Get it wrong and you're looking at reflections, crosstalk, and performance that doesn't match simulation.
The calculator linked below covers the trace structures you're most likely to encounter: Microstrip, embedded microstrip, stripline, asymmetric stripline, broadside coupled stripline, and differential pairs in both microstrip and stripline configurations. Plug in your trace width, dielectric thickness, copper weight, and Dk value and you get characteristic impedance back. Or run it in reverse, start with your target impedance and solve for the trace width you need. When you're ready to lock in a stack-up and confirm your impedance targets, our engineering team reviews controlled impedance requirements as part of the quoting process and works with you to make sure the fabrication spec matches what your design needs.
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