A Power-Optimal Design Methodology for High-Resolution Low-Bandwidth SC Sigma Delta Modulators

作者：Porrazzo Serena^*; Cannillo Francesco; Van Hoof Chris; Cantatore Eugenio; van Roermund Arthur H M

来源：IEEE Transactions on Instrumentation and Measurement, 2012, 61(11): 2896-2904.

DOI：10.1109/TIM.2012.2200812

• Analog-to-Digital Converter (ADC)
• power optimization
• sigma-delta modulator
• switched capacitor (SC)

In this paper, a methodology for the power-optimal design of high-resolution low-bandwidth switched-capacitor Sigma Delta modulators (Sigma Delta Ms) is presented. The most power-efficient Sigma Delta architecture is identified among single-loop feedback and feed-forward topologies with different loop orders N, oversampling ratios OSR, and quantizer resolutions B. Based on this study, an experimental prototype has been implemented in a 0.18-mu m CMOS process. It achieves a signal-to-noise ratio of 95 dB over a signal bandwidth f(BW) of 10 kHz. The prototype operates with a 1.28-MHz sampling rate and consumes 210 mu W from a 1.8-V supply.

• 出版日期2012-11