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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
431
Observation
When we can consider
h
ob
0 and h
rb
0
, then
A
h
h
R
vBJT
fb
ib
CL
.
α
v,i
αα
vi
vi
eb
s
v
v
,,
=
From the input voltage divider
v
RR
RR R
v
eb
EiBJT
sE iBJT
s
=
+
||
||
, so
α
vi
EiBJT
sE iBJT
RR
RR R
,
||
||
=
+
The overall voltage gain is then
A
v
AA
A
vv
vBJT
vi
,
A
hR
hhhhhR
RR
RR R
v
fb CL
ib ib ob fb rb CL
EiBJT
sE iBJT
=−
+−
()
+
||
||
11.7.2.4
C.B.: Output Resistance
We want here to determine the value of the output resistance of the amplier as
already dened in Section 10.2.2 of Chapter 10. The output resistance R
o
is the
one that the amplier presents to its load. Therefore,
R
o
acts as the source resis-
tance for that load.
Similarly to what ...
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Publisher Resources

ISBN: 9781466582026