This book presents a framework for the reuse-based design of AMS circuits. The framework is founded on three key elements: (1) a CAD-supported hierarchical design flow, (2) a complete, clear definition of the AMS reusable block, (3) the design for a reusability set of tools, methods, and guidelines. The book features a detailed tutorial and in-depth coverage of all issues and must-have properties of reusable AMS blocks.