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  3. include a model files for nmos and pmos into virtuoso

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include a model files for nmos and pmos into virtuoso

auto dipper
auto dipper over 11 years ago

 HI all,

how can I include a model files for nmos and pmos into virtuoso like the one which is attached. I want to use this model file as it has equal threshold voltage for pmos and nmos. It is needed only for simulation results.

Regards

m1_typ.doc
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  • Andrew Beckett
    Andrew Beckett over 11 years ago
    1. Put the contents of that document in a file, for example "massobrio.sp"
    2. Create a schematic using transistors from analogLib - I used nmos4 and pmos4, but you could use the 3-terminal devices nmos and pmos if you prefer and set the bulk connections via inherited connections. The default is that nmos has its bulk as gnd! and the pmos as vdd! (If it was me, I'd use the four terminal device to start off with).
    3. Set the model name on the pmos4 to be "pmos" and on the nmos4 to be "nmos" (to match the model file which uses these names - whatever word is after the .model in the file). I set w=10u and l=3u (the models have a delta-l (ld) of 0.8u which is pretty large, so the models are for a quite large geometry process). The delta-l is subtracted from both edges, so a 3um drawn length has an effective length of 1.4u. Even 3um is probably a bit aggressive for a length with such models, I think!
    4. Then start ADE from this schematic and use Setup->Model Libraries. Reference the massobrio.sp file you created in step 1.
    5. Add the analyses (e.g. a tran analysis) and run the simulation

    I just tried this in a couple of minutes (it took me longer to write this reply) and it worked fine.

    Regards,

    Andrew.

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  • Andrew Beckett
    Andrew Beckett over 11 years ago
    1. Put the contents of that document in a file, for example "massobrio.sp"
    2. Create a schematic using transistors from analogLib - I used nmos4 and pmos4, but you could use the 3-terminal devices nmos and pmos if you prefer and set the bulk connections via inherited connections. The default is that nmos has its bulk as gnd! and the pmos as vdd! (If it was me, I'd use the four terminal device to start off with).
    3. Set the model name on the pmos4 to be "pmos" and on the nmos4 to be "nmos" (to match the model file which uses these names - whatever word is after the .model in the file). I set w=10u and l=3u (the models have a delta-l (ld) of 0.8u which is pretty large, so the models are for a quite large geometry process). The delta-l is subtracted from both edges, so a 3um drawn length has an effective length of 1.4u. Even 3um is probably a bit aggressive for a length with such models, I think!
    4. Then start ADE from this schematic and use Setup->Model Libraries. Reference the massobrio.sp file you created in step 1.
    5. Add the analyses (e.g. a tran analysis) and run the simulation

    I just tried this in a couple of minutes (it took me longer to write this reply) and it worked fine.

    Regards,

    Andrew.

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    • Vote Up +1 Vote Down
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