29
FET Small-Signal Model
•
Voltage controlled
amplifier
•
Small-signal model
same for JFETs &
MOSFETs
•
High input impedance
•
i
s
= i
d
g
m
v
gs
G
S
∞
i
d
i
s
i
g
=0
V
gs
r
d
D
+
-
