It’s easy to get a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) to conduct fully with just a voltage. By using complimentary MOSFETs wired in a push pull configuration, you can easily alternate which one is on while the other is off. Therefore alternating whether the output is providing power from the positive or negative supply.
Complimentary means that the MOSFETs have opposite polarity. But otherwise have similar capabilities and limitations.
Since N and P channel enhancement mode MOSFETs connect to the supply voltage that is the opposite of the signal voltage that turns them on, the output voltage will be the opposite of the signal voltage while they are wired together as a push pull. Therefore the output is an inverted voltage of the input signal.
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