12 thoughts on “Model Files”

    • Actually, subthreshold current is modelled in both the 0.35u and 0.18u model files. You can see the subthreshold behaviour clearly in Figure 1.28, which was generated using the provided 0.18um model files. However, not all simulators will properly implement that part of the models.

      The 0.8u model files are just simple level 3 SPICE models, which don’t include subthreshold current. Generally speaking, subthreshold current is less of a concern in that technology.

  1. Hi,

    For technology 0.18um 1.8V BSIM 3.1:

    1. What is W and L range (Wmin, Wmax, Lmin, Lmax)?
    2. What is size step (is it called scale factor?) for W and L? For example, is it equal to 1nm, that is 0.001 um?

    Kind Regards,

  2. In 0.18um model card, in values of some parameters such as Tox, U0 etc. there is additional term “proc_delta”, what it means and what value it takes while simulation?
    Thank you.

    • The term “proc_delta” is a simluation parameter that accounts for deviations in certain transistor parameters (Tox, U0, etc.) from their nominal values due to manufacturing process variations. Note the model card is not to be used on its own. Included in the same zip file are include files for …ff, …ss, and …tt process corners (fast, slow and typical respectively) which assign appropriate values to proc_delta and then instantiate the model card.

  3. Hello
    I use 0.18um CMOS model for my design. I downloaded its Model File from your site. Would you please telling me which parameter shows the factor “n” of subthreshold region of MOSFET?
    Thanks alot

    • The most significant parameters are “NFACTOR=2.30E+00” for NMOS and “NFACTOR=2.00E+00” for PMOS in the 0.18um model provided. However, other terms such as CDSC, CDSCD and CDSCB capture channel length dependent effects on n.


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