Oversampled A/D converters have become very popular in recent years. Some of their advantages include relaxed requirements for anti-alias filters, relaxed requirements for component matching, high resolution and compatibility with digital VLSI technology. There is a significant amount of literature discussing the principle, theory and implementation of various oversampled converters. Such converters are likely to continue to proliferate in the foreseeable future. Additionally, more recently there has been great interest in low voltage and low power circuit design. Developments have occurred in the design techniques proposed for both the digital domain and the analogue domain. Both trends point to the importance of the low-power design of oversampled A/D converters. The goal of this book is to develop a methodology for the optimal design of modulators in oversampled converters. The primary focus of the presentation is on minimizing power consumption and understanding and limiting the nonlinearities that result in such converters. It offers a quantitative justification for the various design tradeoffs and serves as a guide for designing low-power highly linear oversampled converters. It should serve as a valuable guide for circuit design practitioners, university researchers and graduate students who are interested in this area.