Analog circuit design is a very personalized discipline. To be sure, everyone's bound by the same physics and mathematics, but there is no single right way for those tools to be applied to solve a problem. Practitioners of analog design are noted for their individuality. Three of the four introductions that follow are by acknowledged masters of the analog art and deal with analog's place in a world that seems overwhelmed by digital electronics. Each of those three authors gives a highly personal viewpoint that can't be objectively proven right or wrong, but that is the way it is in many aspects of analog design. The remaining introduction, which appears first, does not directly deal with analog electronics at all. However, it does illustrate the matr...