[SI-LIST] 1 Gbps on 3.5 mil etch a hazard?
- From: "N. Paul Taddonio" <paul.taddonio@xxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 19 Oct 2010 12:05:07 -0400
Dear Signal Integrity folks
I am running a PECL diff pair at 1 Gbps, the signal travels 2 inches on 3.5 mil
wide microstrip traces. Un-coupled.
The driver output looks OK: an isolated pulse is about 1 nS wide.
But at the receiver via pair, I find a smeared out signal with insufficient
bandwidth. The pulse is now 1.6 nS wide at the switching point.
I can't get my analog simulation (microsim free eval) to duplicate this effect.
I am using ideal transmission line models.
Do you expect 3.5-mil etch to cause significant dispersion for 1 Gbps signals
at a length of only 2-4 inches?
Paul
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