Push-pull amplification: The output stage of the amplifier has two “arms” (two sets of amplification components). When the current of one “arm” increases, the current of the other “arm” decreases, and the states of the two are alternately converted. For the load, it seems that an "arm" is pushing, and an "arm" is pulling to jointly complete the current output task. Although Class A amplifiers can be push-pull amplifiers, it is more common to use a push-pull amplifier to form a Class B or Class A amplifier.
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