process technology

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process technology

With regard to digital integrated circuits, process technology refers to the particular method used to make silicon chips. The driving force behind the manufacture of integrated circuits is miniaturization, and process technology boils down to the size of the finished transistor and other components. The smaller the transistors, the more transistors in the same area, the faster they switch, the less energy they require and the cooler the chip runs (given equal numbers of transistors).

Measured in Nanometers
The size of the features (the elements that make up the structures on a chip) used to be measured in micrometers. A 3 µm process technology, also called a "technology node" and "process node," referred to a silicon chip with features three micrometers in size. Today, features are measured in nanometers. A 45 nm process technology refers to features 45 nm or 0.45 µm in size.

Elements Measured
Historically, the process technology referred to the length of the silicon channel between the source and drain terminals 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 than the channel size 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.

An Example of Progress
Consider that the process technology of the first 486 chip in 1989 was one micron (1,000 nanometers). By 2003, the state-of-the-art decreased to 90 nm ("90 nano"). In 15 years, feature sizes were reduced by slightly less than one millionth of a meter. What may seem like a minuscule, microscopic change to the casual observer took thousands of man years and billions of dollars worth of research and development. Note the huge variance in semiconductor feature sizes starting in the 1950s (see chart below).

Chips Are Nanotechnology
Intel introduced 45 nm processors in 2008. To understand how tiny 45 nanometers is, it would take two thousand 45 nm objects laid side-by-side to equal the thickness of one human hair.

In 2010, 32 nm chips were introduced, and feature sizes as low as 11 nm are expected in the future. For some time, chips have been in the realm of nanotechnology, which refers to elements 100 nanometers and smaller. See half-node.

Half a Micron Is Huge
In a span of five years, the feature size on these AMD chips was reduced from .8 to .35 microns. Half a micron may seem insignificant, but not in the microminiature world of semiconductor manufacturing. As features get smaller, the chip runs cooler and faster. (Image courtesy of Advanced Micro Devices, Inc.)


Semiconductor Feature Sizes(approximate for all vendors)       Nanometers  MicrometersYear     (nm)        (µm)

 1957   120,000      120.0
 1963    30,000       30.0
 1971    10,000       10.0
 1974     6,000        6.0
 1976     3,000        3.0
 1982     1,500        1.5
 1985     1,300        1.3
 1989     1,000        1.0
 1993       600        0.6
 1996       350        0.35
 1998       250        0.25
 1999       180        0.18
 2001       130        0.13
 2003        90        0.09
 2005        65        0.065
 2008        45        0.045
 2010        32        0.032
 2012        22        0.022
 2014        16        0.016
 2014        14        0.014
 2016**      11        0.011
 2018**       6        0.006
 2020**       4        0.004

 ** estimated
References in periodicals archive ?
These include very fine feature size, powerful, radiation hard electronics in emerging technologies using feature sizes of 130 nm or 65 nm; low-cost silicon sensors in the emerging technology using 8 silicon wafers, also in Europe; environmentally-friendly cooling technologies using liquid carbondioxide; high performance and fast decision making logic using new more powerful FPGA, all to be produced at an industrial scale.
iPDKs of SilTerra's 130 nm Technology Now Available
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4 litre engine, which delivers 103 hp at 6,200 rpm and a maximum torque of 130 nm at 3,400 rpm and it is available with either the four-speed automatic or five-speed manual transmission.
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4-litre, 16-valve, four-cylinder petrol engine that delivers 95PS at 6,000rpm and 130 Nm of torque at 4,000 rpm, coupled with a choice of five-speed manual transmission and a four-speed automatic transmission.