Analysis, Blind Identification, and Correction of Frequency Response Mismatch in Two-Channel Time-Interleaved ADCs
Analysis, Blind Identification, and Correction of Frequency Response Mismatch in Two-Channel Time-Interleaved ADCs
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DOI：
10.1109/tmtt.2015.2409852
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发表时间：
2015-03
影响因子：
4.3
通讯作者：
Simran Singh;L. Anttila;M. Epp;W. Schlecker;M. Valkama
中科院分区：
文献类型：
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作者：
Simran Singh;L. Anttila;M. Epp;W. Schlecker;M. Valkama
针对双通道时间交错模数转换器（TI-ADC）的频率响应失配，提出了一种新的盲辨识和补偿结构。首先，进行频率响应失配的详细建模，建立与众所周知的同相/正交失配问题的直接联系和相似性。从这个模型出发，提出了基于复统计信号处理的盲失配识别和补偿结构。与文献中的现有方法相比，所提出的解决方案可以在ADC系统的全数字带宽（BW）下以全盲方式识别和校正频率响应失配，并且也适用于欠采样TI-ADC器件和RF采样。所提出的解决方案的效率进行了验证，并使用实际的RF采样TI-ADC硬件与千兆赫兹级的瞬时带宽的全面测量证明。
In this paper, novel blind identification and compensation architectures for the frequency response mismatch of a two-channel time-interleaved analog-to-digital-converter (TI-ADC) are proposed. First, detailed modeling of the frequency response mismatch is carried out, establishing a direct connection and similarity to the well-known in-phase/quadrature mismatch problem. Stemming from this modeling, the proposed blind mismatch identification and compensation architectures are then developed building on complex statistical signal processing. Compared to the existing methods in the literature, the proposed solutions can identify and correct the frequency response mismatch in a fully blind manner for the full digital bandwidth (BW) of the ADC system, and are also applicable in sub-sampling TI-ADC devices and RF sampling. The efficiency of the proposed solutions is verified and demonstrated using comprehensive measurements of actual RF-sampling TI-ADC hardware with gigahertz-scale instantaneous BW.