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Principles of Analog Electronics
book

Principles of Analog Electronics

by Giovanni Saggio
January 2014
Intermediate to advanced content levelIntermediate to advanced
567 pages
23h 13m
English
CRC Press
Content preview from Principles of Analog Electronics
Principles of Analog Electronics
278
These conditions allow us to rewrite the Maxwell–Boltzmann distribution as
n
n
e
n
p
qV v
kT
bi D
0
()
=
()
nne
pp
v
V
D
T
0
0
()
=
where
[]
=
VkTq V/
T
is dened as the thermal voltage, that is, an electrostatic
voltage across the junction.
Observation
Let us determine the value of
V
T
at room temperature (20°C):
)
(
)
(
==
+
V
kT
q
mV
1.38*1 0 273.16 20
1.6*10
25.3
T
23
19
We must underline that it is not always a negligible value.
Keeping in mind the expression of the density of diffusion current and combin-
ing the last equations:
JqD
dn
dx
qD n
L
e 1
n
x
n
p
x
np
n
v
V
0
0
0
D
T
==
=
=
JqD
dp
dx
qD p
L
e 1
p
x
n
n
x
pn
p
v
V
0
0
0
D
T
=−
=−
=
=
The diffusion current of minor ...
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Publisher Resources

ISBN: 9781466582026