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二阶Sigma—Delta ADC自适应量化算法及电路实现
  • ISSN号：1006-2467
  • 期刊名称：《上海交通大学学报》
  • 时间：0
  • 分类：TN402[电子电信—微电子学与固体电子学]
  • 作者机构：[1]上海交通大学电子工程系,上海200240
  • 相关基金：国家自然科学基金委创新研究群体基金资助项目（60521002）;上海市科学技术委员会资助项目（0370620022）
作者： 段营[1], 戎蒙恬[1], 刘文江[1]
关键词： Sigma—Delta模数转换器, 信噪比, 自适应量化算法, 电路实现, Sigma-Deta A/D conversion, signal to noise ratio（SNR） , adaptive quantization algorithm, circuit realiration
中文摘要：

分析了二阶Sigma—Delta ADC（SDADC）量化反馈电平对SNR的影响，提出了自适应量化算法及其电路实现．该算法能够检测输入信号的强度、自适应调整量化反馈电平的大小，并在调制器的输出端用数字电路矫正自适应量化引入的输入信号幅度的增长．仿真结果表明，所提出的算法能同时解决由于输入信号强度的减小和量化器过载而引起的SNR下降问题，使得自适应Sigma—Delta ADC（ASDADC）的SNR与输入信号的强度无关，且输入动态范围扩大至满幅．

英文摘要：

This paper studied how the feedback level from quantizer will affect the value of SNR and put forward an adaptive quantizing method, along with it the circuit realization. This method can sense the input strength and adjust the feedback level adaptively. It also brings a digital circuit at the end of the modulator to rectify the growth of input signal amplitude caused by adaptive quantizaion. The simulation result shows that this quantizing method can solve the SNR decreasing problem caused by the decreasing of input signal strength and the quantizer overload. The SNR of the adaptive sigma-delta ADC（ASDADC） is independent of the input signal strength. Besides, the input range is extended to the full scale.

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期刊信息
  • 《上海交通大学学报》
  • 中国科技核心期刊
  • 主管单位:中华人民共和国教育部
  • 主办单位:上海交通大学
  • 主编：郑杭
  • 地址：上海市华山路1954号15F
  • 邮编：200030
  • 邮箱：shjt@chinajournal.net.cn
  • 电话：021-62933373 62932534
  • 国际标准刊号：ISSN：1006-2467
  • 国内统一刊号：ISSN：31-1466/U
  • 邮发代号:4-256
  • 获奖情况:
  • 1996年全国优秀科技期刊奖,1992年、1996年、1999年国家教育部系统优秀科技期刊奖,2002年“百种重点期刊奖”,2003年百种中国杰出学术期刊,2004年教育部全国高校优秀科技期刊一等奖,2004年“百种重点期刊奖”
  • 国内外数据库收录:
  • 美国化学文摘（网络版）,美国数学评论（网络版）,德国数学文摘,荷兰文摘与引文数据库,美国工程索引,美国剑桥科学文摘,英国科学文摘数据库,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊（2004版）,中国北大核心期刊（2008版）,中国北大核心期刊（2011版）,中国北大核心期刊（2014版）,中国北大核心期刊（2000版）
  • 被引量:30903