This book is written for students, practicing engineers and scientists. It covers all important aspects of analog and digital circuit design. Part I describes semiconductor devices and their behavior with respect to the models used in circuit simulation. Basic circuits are analyzed in four steps: large-signal transfer characteristic, small-signal response, noise and distortion. Part II describes the use of operational amplifiers and A/D and D/A converters in low-frequency applications. Part III describes circuits for analog and digital communication over wireless channels. This includes the high-frequency behavior of passive components, amplifiers and mixers. Simulation programs are provided: PSpice for analog circuit design and ispLever for digital circuit design.