A
[email protected]
- Jan 1, 1970
- 0
I am working on an 8-layer board that has two stripline sections. Gnd-
sig-gnd, gnd-sig-gnd type of structure. OK, so when a chip on top
"launches" a differential signal into the lower stripline, I use two
through-hole vias for the signals, but also two vias to connect the
ground planes together, at that point. Then when the signals get to
the connector to go off the board, I do the same thing again.
We have a consultant that says I should put through hole vias
everywhere to connect the two stripline structures together. I think
this is not required, I gave an example of a differential pulse
generator hooked up to a scope, you use two coaxes for this, grounded
at the source end, and grounded at the destination end. You don't
strip the jacket away to connect the two coax grounds together the
whole way. So why should I add ground vias everywhere?
Once the signal is launched into its stripline environment, what is
happening in the other stripline is of no interest, and IMHO
connecting them can cause more problems that it purports to solve.
Who's right, who's wrong, and why?
sig-gnd, gnd-sig-gnd type of structure. OK, so when a chip on top
"launches" a differential signal into the lower stripline, I use two
through-hole vias for the signals, but also two vias to connect the
ground planes together, at that point. Then when the signals get to
the connector to go off the board, I do the same thing again.
We have a consultant that says I should put through hole vias
everywhere to connect the two stripline structures together. I think
this is not required, I gave an example of a differential pulse
generator hooked up to a scope, you use two coaxes for this, grounded
at the source end, and grounded at the destination end. You don't
strip the jacket away to connect the two coax grounds together the
whole way. So why should I add ground vias everywhere?
Once the signal is launched into its stripline environment, what is
happening in the other stripline is of no interest, and IMHO
connecting them can cause more problems that it purports to solve.
Who's right, who's wrong, and why?