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How to build a standard cell model (for a printed transistor) in Cadence

write2rammy
write2rammy over 15 years ago

Hallo,

        I have the model equations for a printed transistor (Quite different from BSIM3 and EKV models). Now I need to use this model in Cadence to simulate circuits. So when I place a nmos the simulator should use this model instead of BSIM3 or EKV.. I guess I can't model this using Verilog-A because I am not intending to do a behavioral modelling.

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  • Andrew Beckett
    Andrew Beckett over 15 years ago

    Why can't you use VerilogA for this? This is comething that VerilogA is being increasingly used for - at least for initial implementation of compact device models.

    To get you started with VerilogA modelling of devices, I'd first of all advise putting this library in your cds.lib and looking at some examples:

    ahdlLib         $(inst_root_with:tools/dfII/bin/icfb)/tools/dfII/samples/artist/ahdlLib

    Within ahdlLib you'll see several cells with veriloga views:

    mos_tft - a thin film transistor model
    mos_level1 - a level1 MOS model
    n_jfet - a jfet model.

    If you want to see some more modern, (and more complex) device models in VerilogA, see
    http://www.nxp.com/models/mos_models/psp/ which covers the NXP/Penn State "PSP" model. In fact you might find it easier to look here: http://pspmodel.asu.edu/

    There are a few other places around that might be useful:

    http://www.bmas-conf.org/2008/2-3_Paper.pdf
    http://www.designers-guide.org/VerilogAMS/ - a collection of models, including links to the EKV model implemented in VerilogA.

    As for books on VerilogA and modelling:

    http://www.designers-guide.org/Books/#Kundert-2004
    http://www.springerlink.com/content/k72461p50036466p/

    The first is a good coverage of the language - the second looks as if it is specifically aimed at people writing transistor models (I have the first book, but not the second).

    Here's another example:

    http://www.designers-guide.org/Forum/YaBB.pl?num=1268789424

    The alternative is that it's possible to implement the model using the C model interface into spectre, but this normally would need epecialist assistance (we do not provide documentation for doing this out of the box). Please contact your account manager or customer support if you want to pursue that route. It's not for the faint hearted and normally would be used only if you have a very large number of instances that will be used, and have detailed experience of device modelling in simulators.

    Regards,

    Andrew.

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  • Andrew Beckett
    Andrew Beckett over 15 years ago

    Why can't you use VerilogA for this? This is comething that VerilogA is being increasingly used for - at least for initial implementation of compact device models.

    To get you started with VerilogA modelling of devices, I'd first of all advise putting this library in your cds.lib and looking at some examples:

    ahdlLib         $(inst_root_with:tools/dfII/bin/icfb)/tools/dfII/samples/artist/ahdlLib

    Within ahdlLib you'll see several cells with veriloga views:

    mos_tft - a thin film transistor model
    mos_level1 - a level1 MOS model
    n_jfet - a jfet model.

    If you want to see some more modern, (and more complex) device models in VerilogA, see
    http://www.nxp.com/models/mos_models/psp/ which covers the NXP/Penn State "PSP" model. In fact you might find it easier to look here: http://pspmodel.asu.edu/

    There are a few other places around that might be useful:

    http://www.bmas-conf.org/2008/2-3_Paper.pdf
    http://www.designers-guide.org/VerilogAMS/ - a collection of models, including links to the EKV model implemented in VerilogA.

    As for books on VerilogA and modelling:

    http://www.designers-guide.org/Books/#Kundert-2004
    http://www.springerlink.com/content/k72461p50036466p/

    The first is a good coverage of the language - the second looks as if it is specifically aimed at people writing transistor models (I have the first book, but not the second).

    Here's another example:

    http://www.designers-guide.org/Forum/YaBB.pl?num=1268789424

    The alternative is that it's possible to implement the model using the C model interface into spectre, but this normally would need epecialist assistance (we do not provide documentation for doing this out of the box). Please contact your account manager or customer support if you want to pursue that route. It's not for the faint hearted and normally would be used only if you have a very large number of instances that will be used, and have detailed experience of device modelling in simulators.

    Regards,

    Andrew.

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