asdf1000 Posted August 29, 2017 Share Posted August 29, 2017 Hi John @JohnSwenson The detail on the website for the USPCB says it preserves impedance match. But there's no mention of 90 ohms or the USB spec. I'm guessing though that this is what the impedance match refers to? Cheers Link to comment
asdf1000 Posted August 29, 2017 Share Posted August 29, 2017 1 minute ago, Superdad said: Yes, 90 ohms. John used stripline impedance calculations (e.g. https://www.pasternack.com/t-calculator-stripline.aspx) in determining the correct trace width, thickness, spacing, and spacing from the above and below shield/ground planes; It is a 4-layer board. Cheers Alex Link to comment
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