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Facebook• 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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