Harold Stephen Black
Harold Stephen Black (14 de abril de 1898 — 11 de dezembro de 1983) foi um engenheiro eletrônico estadunidense.

Revolucionou o campo da eletrônica inventando o amplificador de Realimentação negativa, em 1927.
To some, his invention is considered the most important breakthrough of the twentieth century in the field of electronics, since it has a wide area of application. This is because all electronic devices (vacuum tubes, bipolar transistors and MOS transistors) invented by mankind are basically nonlinear devices. It is the invention of negative feedback which makes highly linear amplifiers possible. Negative feedback basically works by sacrificing gain for higher linearity (or in other words, smaller distortion or smaller intermodulation). By sacrificing gain, it also has an additional effect of increasing the bandwidth of the amplifier. However, a negative feedback amplifier can be unstable such that it may oscillate. Once the stability problem is solved, the negative feedback amplifier is extremely useful in the field of electronics. Black published a famous paper, "Stabilized feedback amplifiers", in 1934.
Q2500
14 de abril
Concept
Q7848
1898
TIME
Q2363
11 de dezembro
TIME
Q2434
1983
TIME
Q126095
engenheiro eletrônico
Concept
Q30
estadunidense
LOC
Q27094
amplificador
Concept
Q183635
Realimentação negativa
Concept
None
electronics
UNK
Q588106
distortion
ORG
None
intermodulation
UNK
Q1585955
Harold Stephen Black
PER
1898-04-14T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
14 de abril de 1898
DATE
1983-12-11T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
11 de dezembro de 1983
DATE
+1927^^http://www.w3.org/2001/XMLSchema#decimal
1927
NUMBER
+1934^^http://www.w3.org/2001/XMLSchema#decimal
1934
NUMBER
country of citizenship
date of birth
date of death