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Digital estimation and compensation method for nonlinearity mismatches in time-interleaved analog-to-digital converters

机译:时间交织模数转换器中非线性失配的数字估计和补偿方法

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摘要

Channel mismatches in time-interleaved analog-to-digital converters (TIADCs) typically result in significant degradation of the ADC's dynamic performance. Offset, gain, and timing mismatches have been widely investigated whereas nonlinearity mismatches have not. In this work, we analyze the influence of nonlinearity mismatches by using a polynomial model. As a cost measure we use the signal-to-noise and distortion ratio (SNDR) and then derive a compact formula describing the dependency on nonlinearity mismatches. Based on the spectral characteristics of the TIADCs, we propose a foreground estimation method and a compensation method using a cascaded structure of adders and multipliers. Through behavioral-level simulations, we prove the validity of the derivations and demonstrate that the proposed estimation and compensation method can bring a considerable amount of improvement in the combined TIADCs dynamic performance. The proposed method is efficient assuming that a smooth approximation of the nonlinearity mismatches is sufficient. (C) 2015 Elsevier Inc. All rights reserved.
机译:时间交错的模数转换器(TIADC)中的通道失配通常会导致ADC的动态性能显着下降。失调,增益和时序失配已被广泛研究,而非线性失配则没有。在这项工作中,我们使用多项式模型分析非线性失配的影响。作为一种成本衡量方法,我们使用信噪比和失真比(SNDR),然后推导一个紧凑的公式来描述对非线性失配的依赖性。基于TIADC的频谱特性,我们提出了一种使用加法器和乘法器的级联结构的前景估计方法和补偿方法。通过行为级仿真,我们证明了推导的有效性,并证明了所提出的估计和补偿方法可以在组合TIADC的动态性能方面带来相当大的改善。假设非线性失配的平滑近似是足够的,则所提出的方法是有效的。 (C)2015 Elsevier Inc.保留所有权利。

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