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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: Variants
487
The quiescent current I
CQ
ows through the collector resistive load
R
C
and causes a large waste of DC power that does not contribute to
the useful AC output power.
P
V
i
o
AC
def
rmsR rmsR
,,
CC
But since
v
V
rmsR
CEQ
C
,
=
2
and
i
I
rmsR
CQ
C
,
=
2
then
PV
I
o
AC
CEQCQ
=
1
2
Finally
P
P
VI
VI
1
2
2
0.25
o
AC
i
DC
CEQCQ
CEQCQ
η=
==
that is,
% 25%
()
η=
This value corresponds to the maximum efciency of a class A amplier, which
is the lowest among all amplier classes. Furthermore, this is a theoretical value
but practically it is even lower, 15–20% in best cases, because actually we do not
make the signal maximally swing up to the borders of the cutoff and saturation
reg ...
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Publisher Resources

ISBN: 9781466582026