Digital Iterative Harmonic Rejection and Image Cancellation for LPF-Less Frequency-Interleaved Analog-to-Digital Converters
Digital Iterative Harmonic Rejection and Image Cancellation for LPF-Less Frequency-Interleaved Analog-to-Digital Converters
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DOI：
10.1109/tcsii.2019.2895341
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发表时间：
2019-01
期刊：
影响因子：
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通讯作者：
Jinpeng Song;Shulin Tian;Yu-Hen Hu;P. Ye
中科院分区：
文献类型：
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作者：
Jinpeng Song;Shulin Tian;Yu-Hen Hu;P. Ye
尽管存在频谱泄漏、谐波干扰、同相/正交和混叠图像等电路损伤，但频率交错模数转换器仍具有大带宽、高速、中高分辨率和可观的抖动鲁棒性。首次引入数字补偿框架，以同时最大限度地减少这些影响。在此框架中，通道重组在校准之前执行。它避免了模拟谐波抑制和通道分离的需求，从而显着简化了复杂的模拟前端设计。制定了包含所有上述扭曲的综合系统模型，并得出迭代解决方案。鉴于参数不匹配，仿真结果验证了该框架的可行性，并有望带来令人印象深刻的性能优势。
The frequency-interleaved analog-to-digital converter features large bandwidth, high speed, medium-to-high resolution with respectable jitter robustness, albeit suffering from circuit impairments such as spectral leakages, harmonic interferences, in-phase/quadrature and aliasing images. For the first time, a digital compensation framework is introduced to minimize these impacts simultaneously. In this framework, channel recombination is performed before calibration. It circumvents the needs for analog harmonic rejection and channel separation, thus enabling significant simplification of the complex analog frontend design. A comprehensive system model that incorporates all the aforementioned distortions is formulated and leads to an iterative solution. Given the mismatch parameters, simulation outcomes validate the feasibility of this proposed framework and promise impressive performance benefits.