-
Vp
)
]
-
I
DSS
?
(
Vds
Vp
)
?
(
Vds
Vp
)
The last two terms cancel leaving:
and this results in a drain to source resistance, Rds, that is no longer dependent on Vds, and to a first approximation Rds is now dependent or a function of the control voltage, Vc: