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Harold Stephen Black (April 14, 1898 – December 11, 1983) was an American electrical engineer, who revolutionized the field of applied electronics by inventing the negative feedback amplifier in 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) are inherently nonlinear, but they can be made substantially linear with the application of negative feedback. Negative feedback works by sacrificing gain for higher linearity (or in other words, smaller distortion/intermodulation). By sacrificing gain, it also has an additional effect of increasing the bandwidth of the amplifier. However

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  • Harold Stephen Black
  • Harold Stephen Black
  • Harold Stephen Black
  • Harold Stephen Black
  • Harold Stephen Black
  • Harold Stephen Black
  • Harold Stephen Black
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  • 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 feedback negativo, em 1927.
  • Harold Stephen Black (Leominster, 14 april 1898 – Summit, 11 december 1983) was een Amerikaans elektrotechnicus die een grote rol heeft gespeeld in de versterkertechniek door zijn ontdekking van tegenkoppeling in 1927, min of meer tegelijkertijd met Klaas Posthumus.
  • Harold Stephen Black (April 14, 1898 – December 11, 1983) was an American electrical engineer, who revolutionized the field of applied electronics by inventing the negative feedback amplifier in 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) are inherently nonlinear, but they can be made substantially linear with the application of negative feedback. Negative feedback works by sacrificing gain for higher linearity (or in other words, smaller distortion/intermodulation). By sacrificing gain, it also has an additional effect of increasing the bandwidth of the amplifier. However
  • Harold Stephen Black (* 14. April 1898 in Leominster, Massachusetts; † 11. Dezember 1983) war ein US-amerikanischer Elektronikingenieur. Black ist als Erfinder des gegengekoppelten Verstärkers bekannt. Die Arbeiten, die zu der Erfindung führten, fanden in der Zeit um 1930 in den Laboratorien der Western Electric Company in den USA statt (Bell Labs). Das Prinzip der Gegenkopplung war von herausragender Bedeutung für die Entwicklung von Telefonverstärkern hoher Qualität. Es bildet darüber hinaus die Basis für fast alle heute in der Praxis eingesetzten Verstärker. Black erhielt 1937 das US-Patent 2102671 für diese Erfindung.
  • Pour les articles homonymes, voir Black. Harold Stephen Black (14 avril 1898 - 11 décembre 1983 (à 85 ans)) était un ingénieurélectricien américain qui a révolutionné l'électronique en inventant le premieramplificateur à contre réaction en1927. Pour certains, son invention est considérée comme la plus importante percée au vingtième siècle dans le domaine de l'électronique , car elle dispose d'un large domaine d'application. Ceci est parce que tous les appareils électroniques (tubes à vide, des transistors bipolaires et transistors MOS) sont intrinsèquement non linéaires, mais ils peuvent être sensiblement linéaires avec l'application de la rétroaction négative. La rétroaction négative fonctionne en sacrifiant le gain pour linéarité supérieure (ou en d'autres termes, plus petite distor
  • Le sue invenzioni furono considerate un grande progresso nel campo dell'elettronica, perché hanno un'ampia area di applicazioni, poiché tutti i dispositivi elettronici (valvole, transistori bipolari e transistori MOS) sono dispositivi non lineari. L'invenzione della retroazione negativa ha dato la possibilità di ottenere un'ampia linearità negli amplificatori(in altre parole riduce la distorsione), sacrificando il guadagno. Sacrificando il guadagno, l'amplificatore ottiene un aumento della larghezza di banda. In ogni caso, un amplificatore retroazionato negativamente può essere instabile e talvolta potrebbe oscillare. Una volta risolto il problema della stabilità, l'amplificatore retroazionato negativamente è estremamente utile nel campo dell'elettronica. Black pubblicò un articolo famoso
  • Harold Stephen Black (ur. 14 kwietnia 1898 w Leominster, zm. 11 grudnia 1983) − inżynier elektryk, naukowiec i wynalazca amerykański. Studiował na politechnice w Worcester (Worcester Polytechnic Institute) gdzie uzyskał w 1921 roku tytuł bakałarza. Pracował następnie dla Western Electric (wówczas głównego partnera produkcyjnego firmy AT&T). Od 1925 roku do emerytury pracował w Laboratoriach Bella. Po latach politechnika w Worcester przyznała mu także doktorat honorowy. Black zrewolucjonizował elektronikę wynalezieniem wzmacniacza ze sprzężeniem zwrotnym w 1927 roku.
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