CMOS - Wikipedia, the free encyclopedia

CMOS - Wikipedia, the free encyclopedia - CMOS From...

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 CMOS From Wikipedia, the free encyclopedia (Redirected from Cmos ) Jump to: navigation , search For other uses, see CMOS (disambiguation) . Static CMOS Inverter Complementary metal–oxide–semiconductor ( CMOS ) (pronounced "see-moss", IPA: /si m s, si m s/ ː ɔː ˈ ː ɒ ), is a major class of integrated circuits . CMOS technology is used in microprocessors , microcontrollers , static RAM , and other digital logic circuits. CMOS technology is also used for a wide variety of analog circuits such as image sensors , data converters , and highly integrated transceivers for many types of communication. Frank Wanlass got a patent on CMOS in 1967 (US Patent 3,356,858). CMOS is also sometimes referred to as complementary-symmetry metal–oxide–semiconductor . The words "complementary-symmetry" refer to the fact that the typical digital design style with CMOS uses complementary and symmetrical pairs of p-type and n-type metal oxide semiconductor field effect transistors (MOSFETs) for logic functions. Two important characteristics of CMOS devices are high noise immunity and low static power consumption . Significant power is only drawn when the transistors in the CMOS device are switching between on and off states. Consequently, CMOS devices do not produce as much waste heat as other forms of logic, for example transistor-transistor logic (TTL) or NMOS logic , which uses all n-channel devices without p-channel devices. CMOS also allows a high density of logic functions on a chip. The phrase "metal–oxide–semiconductor" is a reference to the physical structure of certain field-effect
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transistors , having a metal gate electrode placed on top of an oxide insulator, which in turn is on top of a semiconductor material . Instead of metal (usually aluminum in the very old days), current gate electrodes (including those up to the 65 nanometer technology node) are almost always made from a different material, polysilicon , but the terms MOS and CMOS nevertheless continue to be used for the modern descendants of the original process. Metal gates have made a comeback with the advent of high-k dielectric materials in the CMOS process, as announced by IBM and Intel for the 45 nanometer node and beyond [1] .
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Contents 1 Techni cal details 1 . 1 S t r u c t u r e
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[ edit ] Technical details "CMOS" refers to both a particular style of digital circuitry design, and the family of processes used to implement that circuitry on integrated circuits (chips). CMOS circuitry dissipates less power and is denser than other implementations having the same functionality. As this advantage has grown and become more important, CMOS processes and variants have come to dominate, so that the vast majority of modern integrated circuit manufacturing is on CMOS processes.[ citation needed ] [ edit ] Structure CMOS logic uses a combination of p-type and n-type metal–oxide–semiconductor field-effect transistors (MOSFETs) to implement logic gates and other digital circuits
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CMOS - Wikipedia, the free encyclopedia - CMOS From...

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