Karl Dale Swartzel Jr. (June 19, 1907 – April 23, 1998) was the inventor of the
operational amplifier
An operational amplifier (often op amp or opamp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. In this configuration, an op amp produces an output potential (relative to ...
(or 'opamp'). He filed the patent for the '
summing amplifier' in 1941 when working at
Bell Labs
Nokia Bell Labs, originally named Bell Telephone Laboratories (1925–1984),
then AT&T Bell Laboratories (1984–1996)
and Bell Labs Innovations (1996–2007),
is an American industrial research and scientific development company owned by mult ...
.
[
]
References
1907 births
1998 deaths
20th-century American physicists
Scientists at Bell Labs
20th-century American inventors
{{physicist-stub