高精度低功耗多位量化-Δ调制器的设计*

作者：欧伟，吴晓波 日期：2008-12-26/span> 浏览：3082 查看PDF文档

高精度低功耗多位量化-Δ调制器的设计*

欧伟，吴晓波
（浙江大学 超大规模集成电路设计研究所，浙江 杭州 310027）

摘要：为了解决目前音频应用模数转换器（ADC）功耗过大的问题，提出了模数转换器低功耗设计的目标。在系统设计方面，合理选择过采样率、调制器阶数、量化位数，保证了在满足性能要求的情况下优化信号最大输入幅度和功耗；在考虑各种非理想因素的影响时，结合Simulink进行了详细的验证，获得了功耗优化的模块指标；在电路设计上部分模块采用了新结构，简化了电路模块构成，相应地减小了功耗。通过SPICE仿真得到调制器的功耗降低至200 μW左右，证明了此设计达到了低功耗的优化目的。
关键词：-Δ调制器；多位量化；DWA；低功耗；音频；模数转换器
中图分类号：TN79＋2文献标识码：A文章编号：1001-4551(2008)12-0027-04

Design of a high resolution low power multibit ΣΔ modulator
OU Wei, WU Xiao-bo
(Institute of VLSI Design, Zhejiang University, Hangzhou 310027, China)
Abstract: In order to tackle the power hungry problem of most existing analog-to-digital converter(ADC), the power optimization aim at data converters was put forward. A reasonable combination of oversampling ratio, order and effective bit of quantizer was chosen to optimize requirement of the maximum input signal range and minimum power consumption. Simulink was employed for the nonideality analysis of circuits and reasonable specification of building blocks was chosen while considering low power requirement. In circuit implementation some building blocks were realized in new topology with reduced blocks and simplified design, which also minimize the power requirement. Through the SPICE simulation, the modulator consumed power is only about 200 μW, and it proves the efficiency of the power optimization on modulator design.
Key words: Δ modulator; multibit; DWA; low power; audio; analog-to-digital converter(ADC)
参考文献(References):
［1］SCHREIER R, TEMES G C. Understanding DeltaSigma Data Converters［M］. Piscataway, NJ: IEEE Press,2005.
［2］朱恒芳，姚舜，吴晓波.低功耗Δ调制器系统设计与研究［J］. 机电工程，2007,24(10):22-25.
［3］JIANG Yu. A lowpower multibit Δ modulator in 90nm digital CMOS without DEM［J］. IEEE Journal SolidState Circuits,2005,40(12):2428-2436.
［4］GEERTS Y. A highperformance multibit Δ CMOS ADC［J］. IEEE Journal SolidState Circuits,2000,35(12):1829-1840.
［5］CHEN Jian-zhong. A novel noiseshaping DAC for multibit Δ modulator［J］. IEEE Trans. on Circuits and System,2006,53(5):344-348.
［6］CHENG Yong-jie. Multibit deltasigma modulator with two step quantization and segmented DAC［J］. IEEE Trans. on Circuits and System,2006,53(9):848-852.