Discussion
What is a push-pull output stage?
Answer: D
Push-pull uses one device for the positive half of the waveform and another for the negative, so each need conduct only half the time. Devices in parallel share current within one half, and devices in series form a totem pole. Splitting the cycle between two devices is what makes class B possible at all, and it also cancels the even harmonics that a single-ended stage produces.
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