Hi,
I am trying to find any published paper that describes the mode
transformation comparison (se-to-diff) between differential and single
ended structures. How does SSD21 perform on a single ended via pair vs
a differential via pair. Or in general, traces, connectors, vias.
By now (2021) everyone has accepted to use differential pair routing
for PCB traces, but for vias there is no such unity. Most of use
differential via designs for 10gig and above, where the p and n signal
vias are enclosed in one single oval shaped gnd plane void. While some
engineers still use single-ended vias without manual voids, that
basically maintains the same gnd plane separation between the p and n
signal, as it maintains between neighboring diffpair signals on a 1mm
BGA grid. I'm trying to find some proof with numbers to convince them.
I thought it was self evident. Intuitively the p and n of the same
diffpair should be "closer" in terms of electromagnetic wave
propagation than different diffpairs. I am talking about crosstalk
reduction, and reduction of interference from VRM or other circuitry.
The KR receiver should not have to deal with nearby DDR4 and PCIe
induced interference.
Diff-to-se creates more loss and skew if I understand it correctly,
but se-to-diff is more for interference and crosstalk, which is what
I'm more worried about.
Regards,
Istvan Nagy
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