基于多频参考误差法的TIADC通道失配校准  

Calibration of Channel Mismatches in Time-interleaved ADCs Based on Multi-Frequency Reference Error Method

作　　者：张昊[1] 师奕兵[1] 王志刚[1] 朱肇轩[1] 

机构地区：[1]电子科技大学自动化工程学院,四川成都611731

出　　处：《计量学报》2011年第2期162-167,共6页Acta Metrologica Sinica

基　　金：国家自然科学基金（60772145）

摘　　要：针对时间交替采样系统（TIADC）通道失配的校准问题，分析了TIADC通道失配现象误差的特征，建立了基于参考通道的系统校准模型，提出了一种多频参考误差法，通过快速频率估计及数值查表过程，即可完成有效的误差校准。进一步讨论了方法在系统全输入带宽内的适用性及其校准性能。实验仿真表明，多频参考误差法可将TIADC系统无杂散动态范围提高至少25dB。Aiming at the problem of channel mismatch calibration in time-interleaved ADCs （TIADC）, the characteristics of channel mismatch phenomena are firstly analyzed, then system calibration model is built based on reference channel, finally a new calibration approach called multi-frequency reference error method is introduced. This method can efficiently complete effective error compensation by fast frequency calculation and look up table. In addition to that, the applicability and calibration performance of the method in the whole input bandwidth of TIADC are further discussed. The simulation demonstrated that multi-frequency reference error method can improve the SFDR of TIADC beyond 25 dB.

关 键 词：计量学 多频参考误差法 通道失配 时间交替ADC系统 

分 类 号：TB973[一般工业技术—计量学]