| 20位∑-△A/D转换器的设计 |
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| 引用本文： | 张奇荣,权海洋,张义门.20位∑-△A/D转换器的设计[J].微电子学与计算机,2003,20(6):4-7. |
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| 作者姓名： | 张奇荣 权海洋 张义门 |
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| 作者单位： | 1. 西安微电子技术研究所,西安,710054
2. 西安电子科技大学,西安,710071 |
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| 摘 要： | 文章介绍了20位、5V单电源过采样∑-△A/D转换器,根据精度与阶数和过采样比的关系,设计了4阶蒡-驻调制器。在∑-△调制器中添加了局部负反馈,使转换器能对满量程(FS)输入信号进行精确转换;在梳状滤波器后面添加了补偿电路,补偿梳状滤波器在基带内的衰减,使基带内的纹波小于0.001dB。本电路采用0.6滋mCMOS工艺,电路的结构和精度通过了HSPICE、STAR-SIM等EDA软件的验证。
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| 关 键 词： | ∑-△调制器 梳状滤波器 满量程 |
| 修稿时间： | 2003年1月10日 |
The Design of a 20-bit Sigma-Delta Analog-to-Digtial Converters |
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| ZHANG Qi-rong ,QUAN Hai-yang ,ZHANG Yi-men.The Design of a 20-bit Sigma-Delta Analog-to-Digtial Converters[J].Microelectronics & Computer,2003,20(6):4-7. |
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| Authors: | ZHANG Qi-rong QUAN Hai-yang ZHANG Yi-men |
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| Affiliation: | ZHANG Qi-rong 1,QUAN Hai-yang 1,ZHANG Yi-men 21 |
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| Abstract: | This paper presents a5V20-bit oversampling delta-sigma A/D converter.According to the relationship among reso-lution,order and oversampling ratio,a fourth-order cascaded delta-sigma modulator has been designed.The fourth-order cascaded delta-sigma modulator offer a local feedback tech-nique so as to avoid overload without sacrifice in noise perfor-mance.To compensate the degradation of decimator in pass-band,a compensating function has been applied after the deci-mator.The function and performance of the circuit in0.6COMS technology has been verified with Hspice simulator and mixed simulator STAR-SIM. |
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| Keywords: | Sigma-delta modulation Comb-filter Full-scale |
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