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Differential Pair deskew

Question asked by vytautasr on Aug 17, 2017
Latest reply on Sep 6, 2017 by Dr_joel

Hi,

I have one PCIe test adapter routed not as single ended, but as diff pair. 

After deskew this adapter with open other ends, S11 phase goes up with frequency.

 

I think, something wrong goes with deskew, can single ended lines be deskewed then routed as diff pair?

E5071C

 

editted:

 

here i have Test Adapter with differential routed traces

 

Here are another adapter, single ended routed, that works without problem.

 

I want to be sure that xtalk causes the problem, any ideas?

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