分时交替模数转换器通道失配校准技术进展

Progress of Channel Mismatch Calibration Techniques for Time-interleaved Analog-to-Digital Converters

在简要介绍分时交替模数转换器采样技术及通道失配对其影响机理的基础上,阐述了近年来国内外分时交替模数转换器误差校准技术的最新研究进展,归纳了各个校准技术的实现方法及优缺点。大多数校准技术具有误差估计精度高、收敛速度快、自适应性强等优点,同时存在计算复杂、资源浪费、硬件实现困难等缺点;并进一步分析了当前校准技术存在的关键问题,如输入信号类型及带宽受限、未考虑非线性失配、对于高速高分辨率分时交替模数转换系统应用困难等。最后对未来的发展趋势进行了展望,为推进该领域的研究提供了参考。

The channel mismatch calibration techniques of time-interleaved analog-to-digital converter were reviewed.The study on the sampling technology of time-interleaved analog-to-digital converter was introduced and the influence mechanism of channel mismatch was analyzed briefly,then the latest research progress of the domestic and foreign error calibration techniques of time-interleaved analog-to-digital converter was elaborated.The implementation methods,advantages and disadvantages of each calibration technique were summarized.Most of the calibration techniques have the advantages of high error estimation accuracy,fast convergence speed and strong adaptability;at the same time,they have the disadvantages of complex computation,waste of resources and difficulty in hardware implementation.The key problems of current calibration techniques were further analyzed,such as the limitation of input signal type and bandwidth,nonlinear mismatch not considered,and the difficulty in the application of high-speed and high-resolution time-interleaved analog-digital conversion system.Finally,future development trends were prospected.These findings can provide a reference for advancing the research field.