Op Amp History Highlights
1928
Harold S. Black applies for patent on his feedback amplifier invention.
1930
Harry Nyquist applies for patent on his regenerative amplifier (patent issued in 1933).
1937
U.S. Patent No. 2,102,671 issued to H.S. Black for “Wave Translation System.”
B.D.H. Tellegen publishes a paper on feedback amplifiers, with attributions to H.S. Black and K. Posthumus.
Hendrick Bode files for an amplifier patent, issued in 1938.
1941
Stewart Miller publishes an article with techniques for high and stable gain with response to dc, introducing “cathode compensation.”
Testing of prototype gun director system called the T10 using feedback amplifiers. This later leads to the M9, a weapon system instrumental in winning WWII. ...
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