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process technologyThe 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 0.022 µm in size. Also called a "technology node" and "process node," early chips were measured in micrometers (see table below).
Historically, the feature size referred to the length of the silicon channel between source and drain in field effect transistors (see FET). Today, the feature size is typically the smallest element in the transistor or the size of the gate.
From 1,000 Down to 90
The feature size of the 486 chip in 1989 was 1,000 nm (one micron). By 2003, it was 90 nm, reduced by a little 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 in the early years of semiconductors.
It's Not Always Smaller
In the semiconductor industry, the goal has always been to pack more transistors on the same square millimeter of silicon. At any given time, the smallest feature sizes are found on the latest, high-end CPUs chips that can cost several hundred dollars. However, 8-bit and 16-bit microcontrollers (MCUs) are used by the billions and sell for only a couple dollars. They have far fewer transistors and do not need to be so dense. A USD $2 microcontroller may have feature sizes similar to the high-end chips a decade or two earlier. See microcontroller.
A Miracle of Miniaturization
To understand how tiny these transistors elements are, using 10 nm feature sizes as an example, eight thousand of them laid side-by-side are equal to the cross section of a human hair. See half-node and active area.
|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 faster and uses less energy to perform the same processing. (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 14 0.014 2017 10 0.010 2018 7 0.007 2020 5 0.005 Future Non-Silicon Method 1 0.001 ** Still used for MCUs that do not require state-of-the-art technology (see microcontroller).
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