[SI-LIST] Eye diagram
- From: "Stephen Greenhalgh" <Stephen.Greenhalgh@xxxxxxxxxxx>
- To: "Si-List (E-mail)" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 17 Jan 2006 09:03:01 -0000
Recently I saw an eye diagram in which all the crossovers occurred at 70-80%
amplitude rather than the ideal 50%. Apart from this obvious defect, the eye
looked pretty good. Ever since, I have been wondering what would cause this
effect. My first thought was some difference between the +ve and -ve traces of
the differential signal path, but I cannot formulate a theory that explains
this satisfactorily. For example, if one trace were longer than the other, I
would expect both positive-going and negative-going edges on the longer trace
to be delayed relative to the shorter one, which would mean that some
crossovers were raised, and others lowered, from the 50% level.
Is this a known phenomenon that I have somehow completely missed? I would be
glad for any explanation or suggestion that anyone can offer.
Stephen Greenhalgh
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