[SI-LIST] Re: AC coupling Capacitor

Hi Nitin,
AC coupling capacitors are useful not only when the bias voltage of 
driver and receiver are different, but also when their reference are 
not exacctly the same.
If you connect two different systems with a cable the refernce ground 
could be a different level. Due to this difference the receiver of 
one side can see a signal with a not correct bias level, putting the 
AC coupling capacitors the bias level is generated near the receiver 
and the receivers see tthe signal with a correct bias level.

regards
Carlo

--- In si-list@xxxxxxxxxxxxxxx, <jain.nitin@...> wrote:
>
> 
>  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.=3D0D
> 
> 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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