Introduction
Setting the Stage for the Op Amp
Op amps are high gain amplifiers, and are used almost invariably with overall loop feedback. The principle of the feedback amplifier has to rank as one of the more notable developments of the twentieth century—right up there with the automobile or airplane for breadth of utility and general value to engineering. Most importantly, such feedback systems, although originally conceived as a solution to a communications problem, operate today in more diverse situations. This is a clear tribute to the concept’s fundamental value.
Today the application of negative feedback is so common that it is often taken for granted. But this wasn’t always the case. Working as a young Western Electric Company ...
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