Devoted to the design of CMOS continuous-time filters, this book shows that CMOS is employed because the most complex integrated circuits have been realized with this technology for two decades. The most important advantages and drawbacks of continuous-time filters are clearly shown. The transfer function is one of the most important filter parameters but several others (like intermodulation distortion; power-supply rejection ratio; noise level and dynamic range) are fundamental in the design of high-performance systems. Special attention is paid to the practical aspects of the design, which shows the difference between an academic design and an industrial design. Step-by-step design procedures are often used to clarify the use of the techniques and topologies. The organisation of this text is hierarchical, starting with the design consideration of the basic building blocks and ending with the design of several high-performance continuous-time filters. Most of the circuits have been fabricated, theoretically analyzed and simulated, and silicon measurement results are compared with each other. This book can be used as a text book for senior or graduate courses in this field and can also be useful for industrial engineers.