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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
406
R
oBJT
can be written in the equivalent form
R
hRR
hR Rhhhh
hRR
h
oBJT
ie s
oe sieoerefe
ie s
=
+
()
+−
()
=
+||
||
||
12
12
12
ooe s
RR h||
12
()
+∆
where Δh = h
ie
h
oe
h
fe
h
re
.
Finally for R
o
:
R
o
RR
v
i
;
oo
ce
l
Ropen
def
" "
L
RR R
ooBJTC
= ||
Observations
Knowing the output resistance value is fundamental for different reasons,
among which are the satisfaction of the matching conditions with the load and
the evaluation of the ltering blocking capacitor C
B2
.
When h
re
can be considered practically zero, so that its feedback effect is null
(Section 11.3.2.2), and when
v
s
=
!
0
, it follows that no current will ow through
the input loop i
b
= 0 and, a
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Publisher Resources

ISBN: 9781466582026