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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
441
11.10.3.2 Stability versus V
BEQ
The other stability factor S
V
BEQ
, according to its denition, can be then calculatedas
S
I
VR R
V
CQ
BEQTHE
BEQ
def
=−
++
()
β
β1
In addition, since, typically, β 1 we can approximate
S
RR
R
R
R
R
K
V
TH E
E
E
TH
E
BEQ
≅−
+
≅− =−
+
β
β
β
β
11
1
1
In this case, it is useful to have a high value of R
E
to guarantee stability versus
V
BEQ
variations.
Observation
Note the similarity of the expressions for S
I
CBO
and S
V
BEQ
with the ones already
found for the collector feedback bias network, now with R
TH
replacing R
F
.
11.10.3.3
Stability versus β
Let us determine now the stability factor S
β
.
We know that (Section 8.6.3 in ...
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Publisher Resources

ISBN: 9781466582026