Re: [SI-LIST] : Return planes for Gigabit differential signals

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From: Alex March (alx_march@yahoo.com)
Date: Thu Nov 30 2000 - 04:39:18 PST


    Michael,

    Thanks a lot for your answer.
    However, as far as I know, at the maximum
frequencies associated with such data rates, which
would be above 3GHz, the discrete decoupling
capacitors are totally ineffective, and the buried
capacitance is also of no help.
   So could you comment about the decoupling at those
frequencies?

Thanks again,

Alex

--- Michael Nudelman <mnudelman@tellium.com> wrote:
> Any well-decoupled power plane is good enough. We
> use it without
> noticeable problems.
>
> Mike.
>
> Alex March wrote:
>
> > Hello everybody,
> >
> > I would like to ask your opinion about the
> > following problem: I have a board with some high
> speed
> > SerDes at 2.125 Gbps (differential). Since there
> are
> > many lines like this, I would like to route some
> of
> > them between power planes (2.5V and 3.3V) or
> between a
> > GND and a power plane. This would save me some
> layers.
> > Now I saw some application notes which recomend
> to
> > use only GND planes as reference for these lines,
> so I
> > don't know which is the best solution.
> >
> > Many thanks,
> >
> > Alex
> >
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