The second of two volumes, this is a comprehensive treatment of nonlinear circuits, introducing the advanced topics that professionals need to understand for their RF (radio frequency) circuit design work. It presents an introduction to active RF devices and their modelling, and explores nonlinear circuit simulation techniques. Design techniques are addressed for RF transistor amplifiers, oscillators, mixers and frequency multipliers. This reference concludes with an in-depth look at circuits in systems and their radio system applications, illustrating how the components are interconnected to complete a system that meets the necessary specifications.