| 基于16位SAR模数转换器的误差校准方法 |
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| 引用本文： | 乔高帅,戴庆元,孙磊,谢芳.基于16位SAR模数转换器的误差校准方法[J].微纳电子技术,2009,46(10). |
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| 作者姓名： | 乔高帅 戴庆元 孙磊 谢芳 |
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| 作者单位： | 上海交通大学微纳科学技术研究院,微米/纳米加工技术国家级重点实验室,薄膜与微细技术教育部重点实验室,上海,200240 |
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| 摘 要： | 为了实现较高精度(16位及更高)的逐次逼近(SAR)ADC,提出了一种误差自动校准技术。考虑到芯片面积、功耗和精度的折中,采用了电荷再分配分段电容DAC结构,并采用准差分输入方式提高ADC的信噪比。为了消除电容失配引入的误差,提出了一种误差自动校准算法,利用误差校准DAC阵列对电容失配误差进行量化并存储在RAM中,在AD转换过程中实现误差消除。
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| 关 键 词： | 逐次逼近模数转换器 全差分 电容失配 自动校准 高精度 分段电容数模转换器 |
A Self-Calibration Technique Based on 16 Bit SAR ADCs |
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| Qiao Gaoshuai,Dai Qingyuan,Sun Lei,Xie Fang.A Self-Calibration Technique Based on 16 Bit SAR ADCs[J].Micronanoelectronic Technology,2009,46(10). |
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| Authors: | Qiao Gaoshuai Dai Qingyuan Sun Lei Xie Fang |
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| Abstract: | A self-calibration technique was proposed to realize a high resolution(16 bit or higher) successive approximation register(SAR) analog to digital converter(ADC).Considering the tradeoff among the die area,power dissipation and resolution,the charge redistribution segmented capacitor array DAC architecture was chosen.The SNR was improved with the fully differential input method.A self-calibration arithmetic was proposed to eliminate the capacitor mismatch error.The main principle is that the capacitor mismatch error is quantized with calibration DAC and saved in RAM,and then is eliminated during the conversion cycle. |
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| Keywords: | SAR ADC fully differential capacitor mismatch self-calibration technique high resolution segmented capacitor DAC |
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