Acta Scientiarum Naturalium Universitatis Pekinensis

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Top-Down Design for MASH21 Sigma-Delta Modulator

GE Binjie, WANG Xin’an, ZHANG Xing, FENG Xiaoxing, WANG Qingqin   

  1. Key Lab of Integrated Micro System Science Engineering and Application, Shenzhen Graduate School, Peking University, Shenzhen 518055;
  • Received:2010-04-27 Online:2011-07-20 Published:2011-07-20

MASH21 Sigma-Delta调制器的自顶向下设计


  1. 北京大学深圳研究生院集成微系统科学工程与应用重点实验室, 深圳 518055;

Abstract: The authors propose a top-down design process for MASH21 modulator. In system level, coefficient scaling is used to limit integrator’s output; in circuit level, integrator transient modeling is used to analyze the effect caused by OP’s non-ideality, and get the optimized design region for SNR, area and power. A MASH21 modulator for digital audio application is designed to verify the proposed design criteria. This experimental prototype is implemented with TSMC18MMRF, operates under a single 1.8 V power supply, and achieves a measured SNDR of 91dB.

Key words: MASH21, top-down, Sigma-Delta, modeling

摘要: 提出MASH21调制器的自顶向下设计方法。在系统级, 通过系数缩放对积分器的输出进行限制; 在电路级, 通过积分器的瞬态建模分析运放非理想因素对调制器的影响, 并得到SNR和面积功耗最优的设计区域。通过一个数字音频MASH21调制器的设计对此方法进行了验证。该调制器基于TSMC18MMRF工艺实现, 在1.8 V的单电压下工作, 测试显示调制器的SNDR达到91 dB。

关键词: MASH21, 自顶向下, Sigma-Delta, 建模

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