Re: [SI-LIST] : Testing board stackup

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From: Yu Wang (wangy_km@yahoo.com)
Date: Thu May 10 2001 - 09:15:23 PDT


Diego,
Without adding an extra layer,I would use the below
stackup better.
Here is my 2 cents.

      analog signal
      digital ground
      digital signal (fast digi signals)
      digital ground
      digital signal (slow digi signals)

Yu

--- Diego.KOCH@st.com wrote:
>
> Hi all,
>
> I have the following stackup in a testing board
> form mixed-signal
> devices:
>
> digital signal
> digital ground
> analog signal
> digital ground
> digital signal
>
> The digital signals have a risetime of 500ps.
> The analog signals are
> slow, nearly DC, but of little amplitude. When
> digital signals are
> switching, I have some noise induced in the
> analog traces. I suspect
> this is due to induced magnetic fields into
> analog traces.
> Is it due to wrong layer stackup ? If yes, how
> can I improve it ?
>
> Thank you for everything
>
> Diego Koch
>
>
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