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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
381
Let’s refer to the BJT’s model of Figure11.8.
For a null output voltage v
ce
, the hybrid BJT model results with output
shorted. In this model, h
fe
expresses unitless current-to-current ratio. As a
consequence h
fe
i
b
represents a parallel CCCS (Section 5.3 in Chapter 5) in
output parallel conguration, since i
c
= h
fe
i
b
+ h
oe
v
ce
is a sum of currents.
This CCCS takes into account the part of the input current that “inuences”
the output one, representing a feedforward (reverse of feedback) effect.
h
oe
since i
c
= h
fe
i
b
+ h
oe
v
ce
we can write
=
=
h
i
v
oe
c
ce
i
b
0
Therefore, h
oe
is the ratio of i
c
and v
ce
variations (Section ...
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Publisher Resources

ISBN: 9781466582026