Frank Wanlass

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Dr. Frank Marion Wanlass (May 17, 1933 in Thatcher, AZ – September 9, 2010 in Santa Clara, California) was an American electrical engineer. He obtained his PhD from the University of Utah. Wanlass invented CMOS logic circuits with Chih-Tang Sah in 1963, while working at Fairchild Semiconductor.[1] Wanlass was given U.S. patent #3,356,858 for "Low Stand-By Power Complementary Field Effect Circuitry" in 1967.[2]

In 1964, Wanlass moved to General Microelectronics (GMe), where he made the first commercial MOS integrated circuits, and a year later to General Instrument Microelectronics Division in New York,[3] where he developed four-phase logic.[4]

He was also remembered for his contribution to solving threshold voltage stability in MOS transistors due to sodium ion drift.

In 1991, Wanlass was awarded the IEEE Solid-State Circuits Award.[5]

In 2009, on the 50th anniversary of the integrated circuit, Frank Wanlass was inducted into the National Inventor's Hall of Fame.[6]

Wanlass died on 9 September 2010.


  1. ^ "1963: Complementary MOS Circuit Configuration is Invented". Computer History Museum. Retrieved 6 July 2019.
  2. ^ IC Knowledge - History of the Integrated Circuit - 1960s Archived 2007-04-19 at the Wayback Machine
  3. ^ Bob Johnstone (1999). We were burning: Japanese entrepreneurs and the forging of the electronic age. Basic Books. pp. 47–48. ISBN 978-0-465-09118-8.
  4. ^ Ross Knox Bassett (2007). To the Digital Age: Research Labs, Start-up Companies, and the Rise of MOS Technology. JHU Press. pp. 51, 129–130. ISBN 978-0-8018-8639-3.
  5. ^ List of Solid-State Circuits Award winners
  6. ^ "Inventors Hall of Fame Class of 2009| Patents & Patent Law". | Patents & Patent Law. 2009-02-19. Retrieved 2017-04-12.

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