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Facebook• Class B amplifiers only amplify half of the input wave cycle. As such they
create a large amount of distortion, but their efficiency is greatly improved
and is much better than Class A. Class B has a maximum theoretical
efficiency of 78.5% (i.e., π/4). This is because the amplifying element is
switched off altogether half of the time, and so cannot dissipate power.
• A single Class B element is rarely found in practice, though it can be used in
RF power amplifier where the distortion levels are less important. However
Class C is more commonly used for this.
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