[SI-LIST] : RE: Differential impedance

John Birkett (jbirk@SIDNEY.AMPHENOL-AEROSPACE.com)
Thu, 5 Feb 1998 16:04:21 -0500


A good description of differential impedance can be found at

John Birkett TEL: (607)-563-5657
Amphenol Aerospace EMAIL: jbirk@sidney.amphenol-aerospace.com
40-60 Delaware St. FAX: (607)-563-5714
Sidney, NY, 13838 URL: http://www.bcoenet.com

>From: Mark Nass[SMTP:markn@rccorp.com]
>Sent: Thursday, February 05, 1998 2:43 PM
>To: si-list@silab.Eng.Sun.COM
> 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,
>Mark Nass