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Please share experience with R-extraction of large power MOSFET used in custom power IC

arapsc
Hi, We generally rely on test structure data for estimating metal resistance of large power mosfets used in power IC. Recently, I am using voltage storm and assura R extraction to validate if the tool is accurate enough for such large and intricate layouts. Does anyone in this area have any information to share. Vavo does seem to give a nice current density check for such power mosfets.

  • Hi arapsc

    QRC (replacement for Assura RCX) has a meshR feature which extracts a resistor network for wide metals. This give more accurate R extraction. Hope that this will be useful for you. Please refer to $QRC_HOME/doc/qrcxUser/qrcxUser.pdf for more details.


    Best regards
    Quek

  • Thanks Quek. Yes, a mesh extraction would be more accurate and I will give QRC a try. Currently I am using assura RCX and the results are quite different from experimental data. Even for simple layout cases but with weird metal routing, the current distribution over various metals does not seem to match intuition. However Assura RCX does seem to work well for straight layouts. Overall it is OK. I believe a FEM based tool is needed. Does anyone know what solver Assura RCX use?

  • Hi arapsc

    RCX entered retirement around 2007. It is quite out-dated compared to QRC. If you use QRC, I think you will most probably see an improvemention in results even without using the meshR feature. Both RCX and QRC uses the Nebula field solver which was previously from Agere (now merged with LSI). You can read more about it at this EE times article. The field solver would not be useful for your case because it only extracts capacitance and not resistance.

    Best regards
    Quek

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