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using via in pcie add in card; need advise

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nathan80

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i m currently doing the layout for a pcie add in card using a 4 layer board.


the high speed differential Rx and Tx (propagating till 2.5GHz signals) are not placed in the same layer at the golden finger connector.

please check the layout below:

top layer - red traces
bottom layer - blue traces

the Rx diff traces are connected to the golden finger connector on the top layer.

the tx diff traces has to go through a caps and conncted to the golden finger connector at the bottom layer.

please tell me, if this layout topology can be used: i could not find any guideline on routing high speed differential traces using via
 

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