[SI-LIST] Re: AC Coupled Signals
- From: steve weir <weirsi@xxxxxxxxxx>
- To: EdiFraiman@xxxxxxxxxxxxx
- Date: Mon, 24 Sep 2007 12:06:45 -0700
Edi, I assure you that we have proven that it does matter and there is
considerable gain to be had by doing it optimally. The flip side of the
coin is that if it is done suboptimally results can range from OK to
pretty bad. There are definitely certain arrangements that cause
problems. I would love to go into the details of why this is but that
information is all proprietary.
Regards,
Steve.
Edi Fraiman wrote:
> Hi,
>
> I think that AC cap location is does not matter. You should be more
> aware that capacitance body might change the characteristic impedance of
> your transmission line. In this case you should adjust transmission line
> width.
> Actually is best described by Dr. Howard Johnson's "Potholes" analogy.=20
>
>
> Edi
>
>
> ---Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of npatel@xxxxxxxxxx
> Sent: Monday, September 24, 2007 12:51 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] AC Coupled Signals
>
> Hi all,
> In case of AC coupled signals does anyone know of an optimum placement
> for the caps? I mean should they be placed near the source, receiver,
> middle of the transmission line?
> How much difference does it make in the opening of the eye?
> The signals are differential CML running at 3.0Gbps
>
> Thanks,
> Nikhil=20
>
>
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Steve Weir
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