RFSoC中ADC的SFDR优化技术研究  

Research on SFDR Optimization Technology of ADC in RFSoC

作　　者：白锦 刘生 汪洋 BAI Jin;LIU Shen;WANG Yang(School of Electronics and Information,Zhongyuan University of Technology,Zhengzhou 450007,China)

机构地区：[1]中原工学院电子信息学院,河南郑州450007

出　　处：《电子质量》2024年第9期1-7,共7页Electronics Quality

基　　金：国家自然科学基金(61874072);河南省教育厅重点项目(18A510022)资助。

摘　　要：赛灵思(Xilinx)推出了一款集成了高性能模数/数模转换器(ADC/DAC)的单芯片射频片上系统(RFSoC),由于其具有极高的ADC性能指标和系统集成度,因而得到了广泛的应用。ADC采用时间交织(TI)采样技术,由多个子ADC进行采集组合来提高采样速率,但是由于各子ADC不可能做到工艺完全相同,因此该技术存在偏置失配、增益失配和时间失配等问题,从而造成频谱出现杂散,降低了无杂散动态范围(SFDR)指标。基于RFSoC中ADC的杂散问题,分析了ADC的校准结构,探讨了对SFDR指标进行性能优化的技术方法。大量的实验和分析结果表明,该方法有效地提高了ADC的SFDR指标,具有良好的效果。Xilinx has launched an radio-frequency system-on-chip(RFSoC)that integrates high-performance ADC/DAC.Due to its extremely high ADC performance indicators and system integration,it has been widely used.The ADC uses time-interleaved(TI)sampling technology,which combines multiple sub-ADCs to increase the sampling rate.However,due to the fact that the sub-ADCs cannot be made of the same process,there is a mismatch of offset,gain,and time,which causes spectrum spurs and reduces the spurious-free dynamic range(SFDR)index.Based on the spurious issues of ADC in RFSoC,the calibration structure of ADC is analyzed,and the technical methods for optimizing the SFDR index are explored.Numerous experiment and analysis results show that this method effectively improves the SFDR index of ADC and has good results.

关 键 词：单芯片射频片上系统 模数转换器 无散杂动态范围 时间交织采样 杂散 

分 类 号：TN911[电子电信—通信与信息系统]