[SI-LIST] AW: optimal tline impedance
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "sherman.chen@xxxxxxx" <sherman.chen@xxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 26 Jan 2015 15:41:22 +0000
Hi Chen,
In Backplane Design we always start choosing the right impedance based on the
Connector that has to be used. If the Connector tends to lower impedance or if
the via will come out very capacitive, then an overall lower impedance will
give a much better performance, regardless of the drivers impedance.
There was an intel Paper about this effect (DC 2008?).
BR
Gert
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Chen, Sherman
Gesendet: Montag, 26. Januar 2015 02:37
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] optimal tline impedance
Hi,
This idea may incur some controversial. Hope it's worthwhile.
It's like this:
In channel design, the optimal tline impedance actually depends on the fixed
impedances of TX, RX, and connector, etc. Through optimization you can locate
the best impedance for the trace, and it's not necessarily 85Ohm or 100Ohm. In
this case, to explore every cent of the system performance potential, should we
jump out of the frame of 85Ohm/100Ohm and choose to use other values?
Best Regards,
Sherman Chen
Signal Integrity
EMC Global Hardware Engineering
Tel: +86 21 60951100-3329
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