This may partially relates to this topic, but I just noticed that in Spectre Manual (Virtuoso Simulator Components and
Device Models Reference, V12.11 May 2013), there are two instance parameters.
19 mulu0=1 mobility multiplier. in BSIM3v3 Level-11 Model(bsim3v3) or 65 mulmu0=1.0 Mobility multiplier, alias of mulu0 in BSIM4 Level-14 Model (bsim4).
Another one is:
17 delvto=0 V shift in zer0-bias threshold voltage vth0 in Bsim3v3. or in Bsim4.5 "A new instance parameter DELVTO that may be used to represent threshold voltage variation" And even the equation for delvto is given .
However, these two parameters are only found in manual, not in model cards, or pint model parameters(psf) after simulation. Do they really exist and if so how to retrirve them? In Hspice 2010 vertion manual, these two are given in more detail. But I check hspice.out, still no appearance as well as in model card. It looks both hspic and spectre documented them but I put a question mark on whether any simulator uses them.