[ edit ] main article: negative feedback amplifier the negative feedback amplifier was invented by harold stephen black at bell laboratories in , and granted a patent in ( us patent "a continuation of application serial no. , filed august , ..."). [ ] [ ] "the patent is pages long plus pages of figures...
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, often for audio applications. the relationship of the input to the output of an amplifier—usually expressed as a function of the input frequency—is called the "transfer function" of the amplifier, and the magnitude of the transfer function is termed the gain. contents parameters bandwidth efficiency...
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