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Calculate trace width for all layers?

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swen_s

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I need to route 50 ohm signals on an 8 layer board. To keep the impedance at 50 ohm I need to calculate the trace width on all the layers.

I have found Polar instruments si8000. But is there some free software that I can use?

What program do you use to do this?
 

search in Google u will get online calculators...
For accurate results u need contact fabricator.
 


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