The demand for higher resolution and larger bandwidth Sigma-Delta (DS) A/D converters is being driven by applications such as modern multi-standard communications receivers, high-precision audio, and future software-defined and multi-channel radios. New technology nodes, although offering speed advantages, have lower supply voltages and degraded transistor characteristics. This makes the design of low-voltage highresolution DS A/D converters very challenging. Lucien Breems will present an overview of the DS playground including continuous-time and switched-capacitor DS converters and show architectural and circuit innovations for high-resolution and large-bandwidth DS ADC designs in low-voltage nanometer technologies.