[SI-LIST] : Testing board stackup

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From: Diego.KOCH@st.com
Date: Thu May 10 2001 - 08:46:22 PDT


     
     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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