Discussion
Consider the following statements about class AB.
1. Both devices conduct for slightly more than half the cycle
2. It removes the crossover distortion of class B
3. Its efficiency exceeds class B's theoretical maximum
Which of the statements given above is or are correct?
Answer: B
The first two are correct and the third cannot be: class AB's standing current costs a little efficiency, so it always falls slightly short of class B's 78.5 per cent. It buys much lower distortion for that small loss, which is why nearly every audio output stage is class AB. A claim that a variant beats the ideal it was derived from is worth doubting on that ground alone. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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