Deprecated: Assigning the return value of new by reference is deprecated in /home/freehos1/public_html/blinki/wp-settings.php on line 520

Deprecated: Assigning the return value of new by reference is deprecated in /home/freehos1/public_html/blinki/wp-settings.php on line 535

Deprecated: Assigning the return value of new by reference is deprecated in /home/freehos1/public_html/blinki/wp-settings.php on line 542

Deprecated: Assigning the return value of new by reference is deprecated in /home/freehos1/public_html/blinki/wp-settings.php on line 578

Deprecated: Function set_magic_quotes_runtime() is deprecated in /home/freehos1/public_html/blinki/wp-settings.php on line 18

Strict Standards: Declaration of Walker_Page::start_lvl() should be compatible with Walker::start_lvl(&$output) in /home/freehos1/public_html/blinki/wp-includes/classes.php on line 1199

Strict Standards: Declaration of Walker_Page::end_lvl() should be compatible with Walker::end_lvl(&$output) in /home/freehos1/public_html/blinki/wp-includes/classes.php on line 1199

Strict Standards: Declaration of Walker_Page::start_el() should be compatible with Walker::start_el(&$output) in /home/freehos1/public_html/blinki/wp-includes/classes.php on line 1199

Strict Standards: Declaration of Walker_Page::end_el() should be compatible with Walker::end_el(&$output) in /home/freehos1/public_html/blinki/wp-includes/classes.php on line 1199

Strict Standards: Declaration of Walker_PageDropdown::start_el() should be compatible with Walker::start_el(&$output) in /home/freehos1/public_html/blinki/wp-includes/classes.php on line 1244

Strict Standards: Declaration of Walker_Category::start_lvl() should be compatible with Walker::start_lvl(&$output) in /home/freehos1/public_html/blinki/wp-includes/classes.php on line 1391

Strict Standards: Declaration of Walker_Category::end_lvl() should be compatible with Walker::end_lvl(&$output) in /home/freehos1/public_html/blinki/wp-includes/classes.php on line 1391

Strict Standards: Declaration of Walker_Category::start_el() should be compatible with Walker::start_el(&$output) in /home/freehos1/public_html/blinki/wp-includes/classes.php on line 1391

Strict Standards: Declaration of Walker_Category::end_el() should be compatible with Walker::end_el(&$output) in /home/freehos1/public_html/blinki/wp-includes/classes.php on line 1391

Strict Standards: Declaration of Walker_CategoryDropdown::start_el() should be compatible with Walker::start_el(&$output) in /home/freehos1/public_html/blinki/wp-includes/classes.php on line 1442

Strict Standards: Redefining already defined constructor for class wpdb in /home/freehos1/public_html/blinki/wp-includes/wp-db.php on line 306

Strict Standards: Redefining already defined constructor for class WP_Object_Cache in /home/freehos1/public_html/blinki/wp-includes/cache.php on line 431

Strict Standards: Declaration of Walker_Comment::start_lvl() should be compatible with Walker::start_lvl(&$output) in /home/freehos1/public_html/blinki/wp-includes/comment-template.php on line 0

Strict Standards: Declaration of Walker_Comment::end_lvl() should be compatible with Walker::end_lvl(&$output) in /home/freehos1/public_html/blinki/wp-includes/comment-template.php on line 0

Strict Standards: Declaration of Walker_Comment::start_el() should be compatible with Walker::start_el(&$output) in /home/freehos1/public_html/blinki/wp-includes/comment-template.php on line 0

Strict Standards: Declaration of Walker_Comment::end_el() should be compatible with Walker::end_el(&$output) in /home/freehos1/public_html/blinki/wp-includes/comment-template.php on line 0

Strict Standards: Redefining already defined constructor for class WP_Dependencies in /home/freehos1/public_html/blinki/wp-includes/class.wp-dependencies.php on line 31

Strict Standards: Redefining already defined constructor for class WP_Http in /home/freehos1/public_html/blinki/wp-includes/http.php on line 61

Strict Standards: Redefining already defined constructor for class SimpleGoogleSitemap in /home/freehos1/public_html/blinki/wp-content/plugins/simple-google-sitemap/simple-google-sitemap.php on line 46
CMOS Logic : an introduction:what is CMOS logic | Blinki Blog - 2 GB FREE
Home > Digital electronics > CMOS Logic : an introduction:what is CMOS logic

CMOS Logic : an introduction:what is CMOS logic

October 12th, 2010 admin Leave a comment Go to comments

Complementary metal–oxide–semiconductor (CMOS) , 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 successfully patented CMOS in 1967 (US Patent 3,356,858).

CMOS was also sometimes referred to as complementary-symmetry metal–oxide–semiconductor (or COS-MOS). 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 transistors, having a metal gate electrode placed on top of an oxide insulator, which in turn is on top of a semiconductor material. Aluminum was once used but now the material is polysilicon. Other 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 90 nanometer node and beyond.

“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 when static, 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.

CMOS circuits use a combination of p-type and n-type metal–oxide–semiconductor field-effect transistors (MOSFETs) to implement logic gates and other digital circuits found in computers, telecommunications equipment, and signal processing equipment. Although CMOS logic can be implemented with discrete devices (for instance, in an introductory circuits class), typical commercial CMOS products are integrated circuits composed of millions (or hundreds of millions) of transistors of both types on a rectangular piece of silicon of between 0.1 and 4 square centimeters. These devices are commonly called “chips”, although within the industry they are also referred to as “die” (singular) or “dice”, “dies”, or “die” (plural).

Categories: Digital electronics Tags: ,
  1. No comments yet.
  1. No trackbacks yet.
You must be logged in to post a comment.