Hadamard transformation based frequency response mismatch calibration for a 4-channel TIADC

Lei Qian, Yanze Zheng, Sitao Mei, Sicheng Sun, Huiya Xu, Lianping Guo, Yijiu Zhao
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Abstract

The time-interleaved analog-to-digital converter (TIADC) is one of the most effective solutions for improving the sampling rate of acquisition systems. However, the frequency response mismatch between channels can seriously degrade the performance of the system. In this paper, we propose a calibration method for frequency response mismatches in 4-channel TIADC systems. Following the construction of a four-channel TIADC model using a four-order Hadamard matrix, the error signals were extracted using three time-invariant filters and subsequently subtracted from the output to complete the calibration. It uses the Hadamard transform instead of the complex exponential modulator used in conventional time-varying filter methods, which can further simplify the signal processing without the necessity of complicated calculations. We have employed a stimulated four-channel TIADC system to validate the effectiveness of the proposed calibration technique. Moreover, in a commercial 12.5 GSPS four-channel TIADC system, it is also demonstrated that this approach is effective in improving the spurious-free dynamic range of the system.
基于哈达玛变换的 4 通道 TIADC 频率响应失配校准
时间交错模数转换器(TIADC)是提高采集系统采样率的最有效解决方案之一。然而,通道之间的频率响应不匹配会严重降低系统的性能。本文提出了一种针对 4 通道 TIADC 系统频率响应失配的校准方法。在使用四阶哈达玛矩阵构建四通道 TIADC 模型后,使用三个时变滤波器提取误差信号,然后从输出中减去误差信号,完成校准。它使用哈达玛变换代替了传统时变滤波器方法中使用的复指数调制器,可进一步简化信号处理,而无需进行复杂的计算。我们采用了一个受激四通道 TIADC 系统来验证所提出的校准技术的有效性。此外,在商用 12.5 GSPS 四通道 TIADC 系统中,我们也证明了这种方法能有效改善系统的无杂散动态范围。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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