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Altera s4_pcie_devkit_revb PC board

Altera_Forum
Honored Contributor II
‎02-22-2012 02:40 PM
943 Views

altera s4_pcie_devkit_revb pc board I tried to calculate the impedance control trace on the top, but It seems hard to get 100 Ohms for the differential trace lines 7.75width/6.25gap. 

 

Which tool do they use to calculate the impedance? Did I miss some tricks for this calculation. 

 

Thanks
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