• Class A amplifying devices
operate over the whole of the input cycle such
that the output signal is an
exact scaled-up replica of the input with no
clipping. Class A amplifiers are
the usual means of implementing smallsignal
amplifiers. They are not very
efficient. a theoretical maximum of 50%
is obtainable with inductive
output coupling and only 25% with capacitive
coupling.
• In a Class A circuit, the
amplifying element is biased so the device is always
conducting to some extent, and is
operated over the most linear portion of its
characteristic curve Because the
device is always conducting, even if there is
no input at all, power is drawn
from the power supply. This is the chief
reason for its inefficiency.
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