Frank Wanlass
Dr. Frank Marion Wanlass was an American electrical engineer. He is best known for inventing CMOS logic with Chih-Tang Sah in 1963. CMOS has since become the standard semiconductor device fabrication process for MOSFETs.Biography
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. Wanlass was given for "Low Stand-By Power Complementary Field Effect Circuitry" in 1967.
In 1963, while studying MOSFET structures, he noted the movement of charge through oxide onto a gate. While he did not pursue it, this idea would later become the basis for EPROM technology.
In 1964, Wanlass moved to General Microelectronics, where he made the first commercial MOS integrated circuits, and a year later to General Instrument Microelectronics Division in New York,
where he developed four-phase logic.
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.
In 2009, on the 50th anniversary of both the MOSFET and the integrated circuit, Frank Wanlass was inducted into the National Inventors Hall of Fame for his invention of CMOS logic. He was part of the 2009 class celebrating semiconductor pioneers, along with inventors of semiconductor technologies such as the MOSFET, planar process, EPROM and molecular beam epitaxy.
Wanlass died on 9 September 2010.
