[SI-LIST] Re: LC filters on power pins
- From: rod miller <rod.miller@xxxxxxxxxx>
- To: owsley@xxxxxxxxx
- Date: Thu, 27 Sep 2001 15:09:19 -0400
Bill and David,
I see that you are working with High Speed SERDES. I need some advice...
I am working on a design for a analog test system that may reach Gbit rates (1 -
2.5Gbit) and need some advice on who has the best SERDES solution. I have been
doing some research and have come across Vitesse, TI, Accelerate, ect... I was
wondering which one you would recommend. Any any comments you may have on making
the selection.
Good information and questions on the LC, I will be working on those issues
soon.....
Thanks,
Rod Miller
rod.miller@xxxxxxxxxx
Bill Owsley wrote:
> sshhhhshh... trade secret that keeps us employed.
>
> At 12:13 PM 09/27/2001 , David Kaiser wrote:
>
> >I have a question about LC filters on power SERDES and other Gbit devices.
> >
> >Most SERDES venders provide app notes that suggests using LC filters on the
> >power pins of these Gbit devices to prevent noise from getting on to the
> >power planes. But it seems to me that the LC filter components would have no
> >effect at these Gbit frequencies, and could in fact make matter worse
> >because the power pins would have no more than maybe a small island of
> >interplane capacitance for decoupling. It seems that it would be better to
> >just tie the power pins directly to buired capacitance planes. What do the
> >SI gurus think?
> >
> >Also, it seems that at multiple GHz frequencies, the return path for the
> >noise on the power planes would be so short, that noise would be squelched
> >to quickly to cause problems on the planes.
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> ----------------------------
> Bill Owsley, owsley@xxxxxxxxx
> 919) 392-8341
>
> Compliance Engineer
> Cisco Systems
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