Discussion
What distinguishes class A operation?
Answer: C
Class A means the device never cuts off, conducting for the whole cycle, which gives the lowest distortion and the worst efficiency, at best twenty-five per cent for a resistive load. Half-cycle conduction is class B, short pulses class C, and alternate conduction is the push-pull arrangement that class B usually adopts. The class is defined entirely by the conduction angle, and every other property follows from it. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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