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.

Overview

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 V_DD - V_t we get a degraded 1 output. Likewise with pMOS, we can pull no lower than V_t - 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.

This article is still a stub and needs your attention. You can help improve this article by editing this page and adding the missing information.