[SI-LIST] : AC Coupling vs DC Coupling

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From: Bryan Robb (brobb@lsil.com)
Date: Mon Apr 17 2000 - 09:45:25 PDT

Hi,

I am trying to determine the pros and cons of using
AC vs DC coupling in a backplane application. From looking
at several different types of systems, it appears as if
both are used in some form or another. I am thinking
about DC coupling the system, but I don't want to overlook
any compelling reason to AC couple.

Furthermore, I am trying to maximize my data transfer and
do not want to incur the penalty of an encoding scheme like
8b/10b. So if I don't encode the data stream in some manner,
the data will not be DC balanced which would automatically rule
out AC coupling. Would non-DC balanced data cause a problem in a
system that is DC Coupled? I am speaking about data transfer
rates in the 622 to 800 MHz range.

Thanks in advance,

Bryan 

-- 
*****************************************************************************
   Bryan Robb                           LSI Logic Corporation
   Engineering Manager                  200 West Street
                                        Waltham, MA 02154
   Phone  (781) 290-0238               
   Fax    (781) 890-6158
   Pager  (888) 524-9468

   email:  brobb@lsil.com 
*****************************************************************************

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