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How to set the model parameter STIMOD in simulation?

Alex Liao
Hi

The STIMOD is the LOD stress effect model selector. I can view this after any simulation by printing the model parameter in virtuoso ADE. But I have checked the modelfile.scs which is included in any simulation. It is BSIM4.5 and no such selector found in it. Is there anybody who knows how to set this STIMOD? If it is in print MODEL parameter, it should come from somewhere. Anyone who has knowledge and presents here is highly appreciated.

Thanks,

Alex
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  • Tuotian,

    The first modification won't work, because you have a binned model - and the parameters need to be defined in the bins (the 1:. 2: etc sections).

    The second modification works fine - of course, if you only made the modification in one of the bins, but your transistor has a w or l that doesn't fit between the lmin/lmax or wmin/wmax for that bin, it won't use that bin.

    For example, I took your model and did this:

    // example of setting stimod on a binned model
    parameters dxln=0.1u dxwn=0.1u

    model nch bsim4  {
         1: type=n
         + stimod = 2
         + lmin=9.999997e-006-dxln   lmax=2.00001e-05          wmin=1e-005-dxwn
         2: type=n
         + lmin=1u   lmax=2u          wmin=1u wmax=2u
         }

    M1 (1 2 0 0) nch w=12u l=11u
    //M1 (1 2 0 0) nch w=1.2u l=1.1u
    models info what=models where=screen

    This works fine - if I do "spectre teststimod.scs | grep stimod" you'll see:

     Simulating `teststimod.scs' on lnx-andrewb-w520 at 9:15:01 AM, Thur Aug 29,
         stimod = 2

    If I comment out the first M1, and uncomment the second M1, I get:

     Simulating `teststimod.scs' on lnx-andrewb-w520 at 9:14:50 AM, Thur Aug 29,
         stimod = 0

    From your original post, I assumed that you were seeing stimod as being set in your models, but if it was showing 0, that is just the default value...

    Regards,

    Andrew.

Reply

  • Tuotian,

    The first modification won't work, because you have a binned model - and the parameters need to be defined in the bins (the 1:. 2: etc sections).

    The second modification works fine - of course, if you only made the modification in one of the bins, but your transistor has a w or l that doesn't fit between the lmin/lmax or wmin/wmax for that bin, it won't use that bin.

    For example, I took your model and did this:

    // example of setting stimod on a binned model
    parameters dxln=0.1u dxwn=0.1u

    model nch bsim4  {
         1: type=n
         + stimod = 2
         + lmin=9.999997e-006-dxln   lmax=2.00001e-05          wmin=1e-005-dxwn
         2: type=n
         + lmin=1u   lmax=2u          wmin=1u wmax=2u
         }

    M1 (1 2 0 0) nch w=12u l=11u
    //M1 (1 2 0 0) nch w=1.2u l=1.1u
    models info what=models where=screen

    This works fine - if I do "spectre teststimod.scs | grep stimod" you'll see:

     Simulating `teststimod.scs' on lnx-andrewb-w520 at 9:15:01 AM, Thur Aug 29,
         stimod = 2

    If I comment out the first M1, and uncomment the second M1, I get:

     Simulating `teststimod.scs' on lnx-andrewb-w520 at 9:14:50 AM, Thur Aug 29,
         stimod = 0

    From your original post, I assumed that you were seeing stimod as being set in your models, but if it was showing 0, that is just the default value...

    Regards,

    Andrew.

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