
614 Microwave Engineering
S
S
S
S
S
N-channelP-channel
N-channelP-channel
P-channel N-channel
MOSFETs
(enhancement mode)
MOSFETs
(enhancement mode)
(no bulk)
MOSFETs
(depression mode)
G
G
G
G
G
G
D
D
D
D
D
D
FIGURE 14.26
MOSFET symbols.
G(a)
(b)
(c)
(d)
G
G
G
S
S
S
S
D
D
D
D
BS
0
0
0
0
0
V
d
V
d
V
T
V
T
I
d
I
d
I
d
I
d
V
d
V
d
I
d
I
d
I
d
I
d
I
d
+
++
+
+
+
+
+
–
–
–
–
–
–
–
–
–
–
–
V
gs
V
gs
V
gs
V
gs
= V
d
V
gs
V
g
V
gs
0
0
0
V
gs
V
gs
V
gs
V
gs
–V
gs
V
gs
= V
T
V
gs
= 0
V
gs
= 0
FIGURE 14.25
Symbols, output I–V and transfer characteristics of MOSFET. (a) n-channel enhancement mode
(normally off), (b) n-channel depletion mode (normally on), (c) p-channel enhancement mode
(normally off) and (d) p-channel depletion mode (normally on).