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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
Ampliers: Basic BJT Congurations
421
This equation can be rewritten as
A
i
i
i
i
i
i
A
i
l
e
e
b
b
s
io iBJT
ii
==
αα
,,
A
iBJT
AA
i
i
iBJT
iBJT
e
b
def
For the BJT’s current, i
b
+
i
c
=
i
e
, and we replace the i
c
value with that
from Equation II C.E. ihih
vi
bfeb oe ce e
++ =
. But vv
Ri
ce
eELe
=− =−
, so
ihihRi i
bfeb oe EL
ee
+− =
from which
()
()
+=+hi hR i11
fe
bo
eE
Le
.
So we nally write
A
i
i
h
hR
iBJT
e
b
fe
oe EL
==
+
+
1
1
We can compare this result with the one obtained in Section 11.6.2.2, which is
in agreement with the expressions reported in Table 11.5, that is,
hh
fc fe
=− +
()
1
and
hh
oc oe
=
.
α
i,o
αα
io
io
l
e
i
i
,,
=
From the output current divider equation
i
R
RR
i
l
E
EL
e
=
+
, therefore,
α
io
E
EL
R
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Publisher Resources

ISBN: 9781466582026