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classic 1934 paper first details the use of negative feedback in electronic amplifiers. According to Black:
::"Positive feed-back increases the gain of the amplifier, negative feedback reduces it."According to confusion in the terms arose shortly after this:
::"...Friis and Jensen had made the same distinction Black used between 'positive feed-back' and 'negative feed-back', based not on the sign of the feedback itself but rather on its effect on the amplifier's gain. In contrast, Nyquist and Bode, when they built on Black's work,

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