A good description of differential impedance can be found at
John Birkett TEL: (607)-563-5657
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>From: Mark Nass[SMTP:firstname.lastname@example.org]
>Sent: Thursday, February 05, 1998 2:43 PM
> We are laying out a board that has differential a SCSI bus on it.
>The specs say the that the differential impedance should be 110-135
> What is differential impedance? Is this the impedance between
>the 2 traces, or the impedance with respect to the plane?
>Thanks for your help,