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We appreciate the enthusiastic response to the original book, Analog Circuit Design: A Tutorial Guide to Applications and Solutions. The acceptance of this book emphasizes the need for making good circuit design applications accessible. These writings on applications ill a vacuum, since the majority of application notes and magazine articles do not have suficient depth to teach analog design. At the time I learned analog design, there were not yet any analog ICs. Circuits were all transistorized (maybe some tubes) and the circuit explanations in magazines and books were more complete than many are today. In those days equipment manuals included schematics for repair. I was fortunate to work at a large company with a huge calibration lab for their equipment. I spent many lunch hours perusing the calibration and repair manuals for analog systems. I thank HP, Tektronix and many other companies for their tutorials on analog circuit design that I discovered in the calibration lab. It is interesting to note that Jim Williams in his early years at MIT spent much time repairing electronic test equipment that was nonfunctional. Today’s manuals are more sparse.

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.