A novel technique for the numerical extraction of equivalent circuits from
physics-based device simulation is presented. The method is based on the pa
rtitioning of the device into functional regions, each corresponding to a c
ircuit black. All the circuit elements have a clear physical interpretation
. Element values are directly obtained from small-signal de device simulati
on. The method generates equivalent circuits of a complexity similar to the
traditional approach, with model generation times comparable with those of
black-box and physics-based device models. Applications to one-dimensional
pn junctions and bipolar transistors are presented, discussing the extract
ion algorithm in detail.