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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
391
However, as
=+III
EQ BQ CQ
and
≅βII
CQ BQ
, the result is
()
≅+βII
EQ BQ
1 ; therefore,
the KVL equation can be rewritten as
()
≅+++β
VRIV
RI
CC BQ BEQE BQ
1
1
from which
()
++β
I
VV
RR
BQ
CC BEQ
E
1
1
and
()
≅β ≅β
++β
II
VV
RR
CQ BQ
CC BEQ
E
1
1
()
()
≅+β≅
+
II
VV
R
R
EQ BQ
CC BEQ
E
1
1
1
If we meet the conditions of
()
RR
E
1
1
and
()
≅β
1 (the latter practically
always veried) then
I
VV
R
CQ
CC BEQ
E
The result is that
I
CQ
is now practically independent of β. It seems a good solution
but it may not be, because
()
RR
E
1
1
means that
R
1
is low or
R
E
is large, but
R
1
low cannot bias the base-emitter junction correctly, and a large
R
E
can drasti ...
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Publisher Resources

ISBN: 9781466582026