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How big impedance should be OK as the Diff.impedance?

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edaboardman

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In my PCB, there is a difference pair track, sourse are GS9024's SDO+ and SDO-,which can drive 75 omh load ,terminal are GS7032's SDI+ and SDI-,which can be drived by 75 omh sourse. circuit works at 270MHz.

I designed them as difference pair,how big impedance should be OK as the Diff.impedance?
75?
100?
150? or other?
I use SITS2,0,3,0 as the software tool.
Thank you!
 

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