This is a Class B amplifier, or push-pull follower. There is no voltage gain, but it amplifies current.

One drawback of the simple class B push-pull is crossover distortion. This example is a big improvement over the previous example.

In the last example, each half of the circuit conducts over half the waveform. In this example, each half conducts a small amount on the other half. This improves linearity (reducing crossover distortion), but it's not quite as efficient; when there is no output, it still draws current.

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