Total mobile electron charge 0 CONDUCTOR i Current i Q t T Total mobile electron charge Q Transit time t T Total fixed positive charge Q ID: 759810
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Slide1
INSULATOR
i
Current
i
= 0
Total mobile electron charge
= 0
Slide2CONDUCTOR
i
Current
i
=
Q
–
/
t
T
Total mobile electron charge
=
Q
–
Transit time
=
t
T
Total fixed positive charge
=
Q
+
=
Q
–
Slide3MOSFET
Drain
Source
Channel
i
d
Gate
i
g
Gate oxide
Gate current
i
g
=
dQ
+
/dt
Gate current
i
g
= 0
Drain current
i
d
= 0
Slide4MOSFET
Drain
Source
Channel
i
d
Gate
i
g
Gate oxide
Drain current
i
d
=
Q
–
/
t
T
Total channel electron charge
=
Q
–
Transit time
=
t
T
Total gate charge
=
Q
+
=
Q
–
Gate current
i
g
= 0
Slide5MOSFET
Drain
Source
Channel
i
d
Gate
i
g
Gate oxide
Drain current
i
d
=
Q
–
/
t
T
Total channel electron charge
=
Q
–
Transit time
=
t
T
Total gate charge
=
Q
+
=
Q
–
Gate current
i
g
=
dQ
+
/
dt
i
g
Drain current
i
d
= 0
Slide6BJT
Current
i
c
= 0 (insulating/off state)
Collector (
n
)
Emitter (
n
)
Base (
p
)
i
c
i
b
Current
i
b
=
dQ
+
/dt
Current
i
b
= 0
Current
i
b
=
Q
+
/
t
L
t
L
= minority carrier lifetime
Slide7BJT
Current
i
c
=
Q
–
/
t
T
Total mobile electron charge
=
Q
–
Transit time
=
t
T
Total fixed positive charge
=
Q
+
=
Q
–
Collector (
n
)
Emitter (
n
)
Base (
p
)
i
c
i
b
Slide8BJT
Current
i
b
=
dQ
+
/
dt
(< 0)
Collector (
n
)
Emitter (
n
)
Base (
p
)
i
c
i
b
i
b
Slide9BJT
Collector (
n)
Emitter (n)
Base (p)
i
c
i
b
Current
i
b
= 0
Current
i
c
= 0