Even if the simpler
definitions (like 2) can be used
for given technologies within some restricted parameter range,
the uncertainty is unacceptable for explorative design studies
(involving large parameter variations) and
for research activities, where
data are communicated between
different organizations.
The conclusion drawn from these data is that the only useful
threshold voltage definitions for low-voltage technologies are the
linear threshold voltage
5 and the
saturation threshold voltage
6.