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vias for differential signals

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deba_fire

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Hi Everyone,

It is said that to provide good return paths there should be adjacent vias near differential signals when they switch layers.I am not able to understand what these vias are connecting.For example,if my differential signals are going from top to bottom layer in a 4-layer board,where I should put these vias between what and what?Similar question is for single ended signals,when they change layers its good to put vias.But again vias connection what?

Regards
DB
 

Not my thread but ...
Some good links marce - thank you for those.

jack
 

Thanks marce for the links.Will study them and understand.
 

I agree, that in a ususal 4-layer design, there would be nothing to connect for adjacent (or "stitching") vias. If you have additional copper pour embedding the signal traces (may be used to adjust the impedance or as guard), then it would be reasonable to connect it to the ground plane by additional vias. The said adjacent vias topic rather applies for designs with multiple ground planes.
 

Hi FvM,

Ya In a usual 4-layer board there is nothing ground vias can do as signal change layers as there is only one ground plane.But if we have some ground filling on the signal layers should we stitch this ground fill to the ground plane near the places where signal change layers??please comment.
 

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