1. Introduction. 1.1 Categories of Variations in Analog and Mixed Signal ICs. 1.2 The Essence of Adaptation. 1.3 The process of Adaptation. 1.4 Book Outline. 2. Adaptive Architectures. 2.1 Automatic Tuning. 2.2 Post Fabrication Tuning. 2.3 Summary. 3. Tunable Elements. 3.1 Voltage-Controlled Transconductors. 3.2 Comparators. 3.3 Summary. 4. On Chip Resistors and Capasitors. 4.1 Passive Resistors. 4.2 Passive Capasitors. 4.3 Summary. 5. A Digital Adaptive...