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"Complementary Metal-Oxide Semiconductor" is a process which implements a combination of PMOS and NMOS transistors. Most current digital logic is implemented in CMOS. Its cost-effectiveness due to being so widespread means many other applications have become common as well, such as in analog design, image sensors, telecommunication, etc.

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Why do we use a CMOS for inverting a circuit when the PMOS already achieves that?

CMOS, while more complex to make, consumes very little power when not switching, while PMOS consumes more power even when it's not switching. …
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