邓红辉^{1, 2},
闫辉¹,
肖瑞¹,
陈红梅^{1, 2,,}
1.合肥工业大学微电子设计研究所 合肥 230601
2.教育部IC设计网上合作研究中心 合肥 230601
基金项目:国家自然科学基金(61704043)，合肥工业大学校博士专项科研基金(JZ2017HGBZ0955)

详细信息

作者简介:邓红辉：女，1973年生，副研究员，硕士生导师，研究方向为模拟、混合信号集成电路设计低功耗电路设计
闫辉：男，1995年生，硕士生，研究方向为集成电路设计与测试
肖瑞：女，1995年生，硕士生，研究方向为嵌入式系统综合测试
陈红梅：女，1986年生，博士，讲师，研究方向为高速数模混合集成电路设计

通讯作者:陈红梅　hmchen@hfut.edu.cn

中图分类号:TN911.72

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被引次数:0

出版历程

收稿日期:2019-01-18
修回日期:2019-05-12
网络出版日期:2019-08-23
刊出日期:2020-02-19

Fully Digital Feedforward Background Calibration of Time Skew for Sub-Sampling Time-interleaved Analog-to-digital Converter

Honghui DENG^{1, 2},
Hui YAN¹,
Rui XIAO¹,
Hongmei CHEN^{1, 2,,}
1. Institute of Very Large Scale Integration Design of Hefei University of Technology, Hefei 230601, China
2. Ministry of Education IC Design Web-cooperation Research Center, Hefei 230601, China
Funds:The National Natural Science Foundation of China (61704043), Hefei University of Technology Ph.D. Special Fund (JZ2017HGBZ0955)


摘要
摘要:该文设计实现了一种全数字前馈式时间交织模数转换器(TIADC)时间误差校准算法，其中采样时间误差提取采用改进的时间误差函数求导模块的前馈式提取方法，可以提高在输入信号频率较高时误差提取的准确度；同时，为了降低误差提取单元的复杂性，采用了以减法实现的时间误差函数；最后，采用基于1阶泰勒补偿完成时间误差的实时校正。仿真验证表明，应用于4通道14位TIADC系统，当输入信号为多频信号时，系统动态性能无杂散动态范围(SFDR)从48.6 dB提高到80.7 dB。与传统基于前馈校准结构对比，可以将有效校准输入信号带宽从0.19提高到0.39，提高了校准算法的应用范围。
关键词:时间交织模数转换器/
时间误差数字校准/
前馈式/
时间误差函数
Abstract:A full digital feedforward Time-Interleaved Analog-to-Digital Converter (TIADC) time skew calibration algorithm is presented, the time skew estimation adopts the feedforward extraction method of the improved derivative module of time skew function, which can greatly improve the accuracy of skew estimation when the input signal frequency is high. At the same time, the time skew function is based on subtraction, in order to reduce the complexity of skew estimation unit. Finally, the time skew is corrected by using first-order Taylor compensation. The simulation results show that when the input signal is a multi-frequency signal, the Spurious-Free Dynamic Range (SFDR) increases from 48.6 dB to 80.7 dB, after adopting the proposed time skew correction for a 4-channal 14-bit TIADC system. Compared with the traditional feedforward calibration structure based on correlation operation, the effective calibration input signal bandwidth can be increased from 0.19 to 0.39, which greatly increases the application range of the calibration algorithm.
Key words:Time-Interleaved Analog-to-Digital Converter (TIADC)/
Digital calibration of time skew/
Feedforward/
Time skew function



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