[SI-LIST] Re: AC coupling Capacitor

Hi Nitin,

In addition to what the other folks have stated, two AC coupling capacitors, 
one at the source and one at the destination, have been suggested by some 
vendors for hotswap protection of both driver and receiver.

Also, in my simulation experience, the capacitor package and pad parasitic 
losses that inevitably occur may force placement at the end of the 
transmission line so these losses are lost in the rise-time of the entire 
system loss. Whether this is required can only be determined by doing margin 
analysis with the simulated worst case results.

All the best,
Steve

Stephen P. Zinck
Interconnect Engineering Inc.
P.O. Box 577
South Berwick, ME 03908
Phone - (207) 384-8280
Fax - (207) 676-8676
Email - szinck@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Web - www.interconnectengineering.com

----- Original Message ----- 
From: <jain.nitin@xxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Thursday, May 25, 2006 7:03 AM
Subject: [SI-LIST] AC coupling Capacitor


>
> Hello,
>
> For a gigabit differential pair AC coupling capacitor is used. But what
> exactly is the use of AC coupling capacitors? I believe that they are
> used when the bias voltage of driver & receiver are different.=0D
>
> Also where exactly AC coupling capacitors should be placed when the
> differential trace is running on a backplane from one daughter card to
> other (at driver end or at receiver end).
>
> What will happen if two AC coupling caps are used. One at driver side
> and other at receiver side.
>
> With regards,
> Nitin
>
>
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