I am an engineer building a HF transistor library NXP SiGe_C transistors
the published models have the transit time parameters:
Tf="1.3236e-12" Xtf="43.92" Vtf="-17.68" Itf="89e-3"
QUCS gives Range ERROR for Vtf, and and aborts Sim.
Have manually computed the Tff value from Tech paper, and results are quite reasonable. I beleive the range checking code needs modification.