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This book describes the theory, design and realizations of continuous-time sigma-delta modulators for analog-to-digital conversion in radio receivers. The challenge of the work is the design of a sigma-delta modulator with high linearity, large dynamic range and strong image rejection capabilities. With such an A/D converter, requirements for a receiver architecture in terms of selectivity and sensitivity can be relaxed, resulting in a cheaper system with a higher level of integration. Important trends in the receiver design for wireless portable applications are: smaller product sizes, cheaper products and longer stand-by times. Products can be made smaller and cheaper by increasing the level of integration. This means on-chip integration of external components, such as inductors and filters. Herein, an important role can be played by the A/D converter. Shifting the A/D converter towards the antenna side of the receiver, allows more digital integration of (external) analog functions on a single digital chip. However, this requires an A/D converter with high linearity, dynamic range, bandwidth and image rejection capabilities