Method for correcting overlapping band phase difference of parallel ADC structure with mixer

Method for correcting overlapping band phase difference of parallel ADC structure with mixer
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一种混频器并行ADC结构重叠带相位差校正方法

DOI:
10.1088/1748-0221/15/12/p12027
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发表时间:
2020-12
影响因子:
1.3
通讯作者:
Y. Zhao
Y. Zhao
中科院分区:
工程技术4区
文献类型:
--
作者:
Y. Zhou;P. Ye;K. Yang;Y. Zhao

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具有混频器的各种并行ADC结构(例如DBI-ADC、ATI-ADC)对于宽带高速数据采集系统来说是有吸引力的结构。然而,这些结构具有固有的缺点:相邻子带重叠频带附近的子带之间的相位差导致系统频率响应显着恶化。原始的校正方法依赖于高性能电路和组件或消耗大量数字资源的校正算法。本文提出了一种针对重叠频段的相位差校正新方法,并通过实验结果证明了其有效性。该方法利用了采集系统本身的结构特点,无需额外的资源,并且保证相位差不影响系统信噪比。
Various parallel ADC structures with mixers (such as DBI-ADC, ATI-ADC) are attractive structures for broadband high-speed data acquisition systems. However, these structures have inherent disadvantages: the phase difference between subbands in the vicinity of overlapping bands of adjacent subbands causes the system frequency response to deteriorate significantly. The original correction method relies on high-performance circuits and components or correction algorithms that consume a lot of digital resources. This paper proposes a new method of phase difference correction for overlapping frequency bands and proves its effectiveness through experimental results. This method uses the structural characteristics of the acquisition system itself, without additional resources, and ensures that the phase difference does not affect the system SNR.
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