The fundamental difference between analog and digital is ‘‘information.’’ With digital information the output is always the same: a set of ones and zeros that represents the information. This information is independent of the supply voltages or the circuitry that is used to generate it. With analog, the output information is basic electrical values—volts, current, charge—and is always related to some real world parameters.With analog, the methodology used to arrive at the answers is intrinsic to the quality of those answers. Errors such as temperature, noise, delay and time stability can all affect the analog output and all are a function of the circuitry that generates the output. It is this analog output that is difficult to derive and requires experience and circuit design talent.

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Analog Design and Simulation Using OrCAD Capture and PSpice