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Speed of a signal and impedance

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E

expertengr

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Newbie level 1
I have a question on the speed of signal and impedance of the trace. Please have a look in attachment.
 

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There should be 12 instead of 83.
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You apparently confuse a lot. 12 appears in the denominator, 83 in the numerator. Quoting formulas from a book without derivation is almost useless. I can just guess that 1000/12 = 83.3
 

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