process technology - Computer Definition
The particular manufacturing method used to make silicon chips, which is measured by how small the transistor is. The driving force behind the design of integrated circuits is miniaturization, and process technology boils down to the never-ending goal of smaller. It means more computing power per square inch, and smallness enables the design of ultra-tiny chips that can be placed almost anywhere. Feature Size Measured in Nanometers The size of the features (the elements that make up the structures on a chip) are measured in nanometers. A 22 nm process technology refers to features 22 nm or 0.22 Âµm in size. Also called a "technology node" and "process node," early chips were measured in micrometers (see table below). The Exact Measurements Historically, the size referred to the length of the silicon channel between source and drain in field effect transistors (see FET). The sizes of other features are generally derived as a ratio of the channel length, where some may be larger and some smaller. For example, in a 90 nm process, the length of the channel may be 90 nm, but the width of the gate terminal may be only 50 nm. From 1,000 Nanometers Down to 10 The feature size of the 486 chip in 1989 was 1,000 nanometers (one micron). By 2003, it was 90 nm. The size was reduced by slightly less than one millionth of a meter. What may seem like a minuscule reduction took thousands of man years and billions of dollars worth of R&D. In the table below, note the dramatic reductions early on. Chips Are a Miracle of Miniaturization To understand how tiny these feature sizes are, it would take six thousand of these elements laid side-by-side to equal the thickness of one human hair. See half-node.