From: Michael Nudelman (firstname.lastname@example.org)
Date: Wed Oct 11 2000 - 08:12:25 PDT
First, do not use FR-4.
Try something else. We do, and it works without equalization. And the backplane
is huge. The traces' runs are up to few feet. Also try to use broadside
coupling; if your skin losses are high, this helps a bit.
Todd Derego wrote:
> I'm working to take a present 1.25Gbps backplane to 2.5Gbps or
> faster. Any thought on transceivers with preemphasis and/or adaptive
> equalization to help get 2.5Gbps or better across a long FR4 backplane? The
> eye looks pretty collapsed at 2.5Gbps but I have seen some products the
> drive across a twisted pair and seem to recover a signal from something that
> does look much like a signal.
> Todd DeRego
> Senior Signal Integrity Engineer
> Lucent Technologies INS
> 200 Nickerson Road
> Marlborough MA 01752
> (508) 786-2168
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