Focusing on the computer-aided analysis of nonlinear microwave circuits, this text discusses the techniques used to analyze such circuits and shows the reader how to get better performance from these techniques using circuit-analysis software. It details the use of semi-analytic and numerical physical models in nonlinear circuit analysis, and reviews the two uses of physical models in nonlinear CAD. Supported by 330 equations, practical examples, and ready-made samples of computer code written in C, this book should be of interest to microwave engineers, researchers, developers and graduate students.