Encyclopedia > Very-Large-Scale Integration

  Article Content

Very-Large-Scale Integration

Very-Large-Scale Integration (VLSI) of systems of transistor-based circuits on a single chip first occurred in the 1980s as part of the semiconductor and communication technologies that were being developed.

The first semiconductor chips held one transistor each. Subsequent advances added more and more transistors, and as a consequence more individual functions or systems were integrated over time. The microprocessor is a VLSI device.

The first "generation" of computers relied on vacuum tubes. Then came discrete semiconductor devices, followed by integrated circuits. ICs had more than one device on a single chip - diodes, transistors, resistors and capacitors (no inductors though), making it possible to fabricate one or more logic gates on a single device. The fourth generation consisted of Large-Scale Integration, i.e. systems with at least a hundred logic gates. The natural successor to LSI was VLSI (thousands of gates on a single chip). Current technology has moved far past this mark and today's microprocessors have several million gates.



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
East Marion, New York

... is spread out with 18.5% under the age of 18, 4.4% from 18 to 24, 20.6% from 25 to 44, 26.3% from 45 to 64, and 30.2% who are 65 years of age or older. The median age is 49 ...

 
 
 
This page was created in 33.5 ms