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CMOS - Complementary Metal–Oxide–Semiconductor
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CMOS (Complementary metal–oxide–semiconductor) is a technique for constructing digital logic circuits from two complementary MOS transistors - pMOS and nMOS. CMOS is the dominant technology used for VLSI and ULSI circuit chips used for anywhere from SRAM to microcontrollers and microprocessors.


CMOS primarily makes use of what would otherwise be two seperate circuit technologies - pMOS and nMOS. To better understand this, consider an nMOS transistor. Because it can pull no higher than VDD - Vt we get a degraded 1 output. Likewise with pMOS, we can pull no lower than Vt - a degraded 0 output. By combining both types, we can borrow the desired characteristics from both transistors such as a strong 0 and a strong 1.

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