[SI-LIST] Re: length of 10Gig traces on FR4
- From: "Robert Sefton" <rsefton@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 9 Jul 2002 12:58:30 -0700
High-speed connector vendors like Tyco/Amp, FCI, Samtec, etc., have a lot of
information and simulation results for 5G and 10G signaling through
connectors and across FR4 backplanes. Amp has a presentation that shows
acceptable eyes at 10Gbps LVDS across through a connector and 20" of FR4
backplane (if I remember correctly). Routing and connector pinout are
critical at those data rates, and 20" is about the physical limit for FR4.
The dielectric variations and losses, as well as vias, trace variations,
etc., eventually close the eye.
Robert
----- Original Message -----
From: <mittalr@xxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Tuesday, July 09, 2002 11:48 AM
Subject: [SI-LIST] length of 10Gig traces on FR4
>
>
> Does anyone have any program/code which can be used to see the eye diagram
after sending 10gig data over different material, most notabely FR4 and
Rogers.
>
> Failing that, is there a rule of thumb/formula which tells you how long a
trace you can handle, given the loss tangent and skin effects. I know this
is not a fair question since it depends a lot on rise time and receiver
sensitivities thats why an eye diagram is better but still some rule of
thumbs for 10gig speeds will be very welcome
>
> thanks a lot
>
>
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