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Analog Electronics
book

Analog Electronics

by Ian Hickman
October 2013
Intermediate to advanced content levelIntermediate to advanced
342 pages
16h 43m
English
Newnes
Content preview from Analog Electronics
86 Analog Electronics
but
V,
supplies
a
pulsating current, namely
a
full-wave rectified sine wave
of
peak value
21,,.
Now the average value
of
half
a
cycle
of
a sine wave
is
2/tt of
the peak
(a
handy result
to
remember),
so
the power drawn from
the
supply
V,
works
out at
(8/Tr)(Ks7/?i/)
compared with
41/s'//?,
for
the class
A stage. Thus
the
maximum efficiency
at
full
output
for a
push-pull class
Β
stage works
out at
η
=
ΤΓ/ 4
or
78%, against 50%
for the
class
A
stage.
Of course, with practical devices, more like Figure
4.1c than
b, the
achievable efficiency will
be
less,
say 70%
at
best; this gives rise
to the
rule
of
thumb
that
a
class
Β
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Publisher Resources

ISBN: 9781483162287