Control circuits are important parts of RF and microwave systems. Their compact size, high performance, and low cost have played a vital role in the development of cost effective solutions and new applications during the past quarter century. This resource provides a comprehensive treatment of such circuits, including device operation and their models, basic circuit theory and designs, and applications. The unique features of this book include in-depth and comprehensive study of control circuits, extensive design equations and figures, treatment of practical aspect of circuits, and description of fabrication technologies. It provides RF and microwave engineers with a broad view of solid state control circuits including various technologies and their comparison and up to date information.