Why does my model not output the current that is indicated in the ATF55143 data sheet?

[rf_practitioner]

I created a model in ADS for a e-pHEMT transistor and tried running an I-V simulation but the current does not align with what is in the datasheet. I am not sure why. I copied the model verbatim. However, I left some of the parameters(everything after sigma) on the tlinp as the default value if they weren't specified on the datasheet. Please kindly take a look and give feedback.

 

[dick_freebird]

Only off by 2:1, call it "roughly right".

I'd begin with inspecting device operating point
attributes, while set up per datasheet. Your W
and your L may still be defaulted, and you may
not get to know the real physical values for
either one - yet they are direct scale factors for
the raw current (W/L) and the Early voltage (or
lambda, depending on your background, with
L). S/D Terminal C also will follow W, gate C
W*L; Cgd/Cgs, W.

Some simulators make you jump through
a hoop to apply geometries to what their
developer thought were "discrete" (fixed
geometry & electrical attributes) device
instances, and all simulators do not apply
the same defaults.

Based on where you see discrepancies,
"table to table", make some sense of the
likely geom "knobs" and massage the fit.