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A novel noise-coupled time-interleaved delta-sigma modulator with analysis of practical limitations

机译：具有分析实际限制的新型噪声耦合时间交错δ-Sigma调制器

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摘要

An analog-to-digital converter based on the time-interleaved delta-sigma modulator is a proper method for high-speed ADCs. Time-interleaved delta-sigma modulators (TIDSM) can be successfully implemented with the development of the block digital filtering (BDF) technique. In this method, M mutually cross-connection delta-sigma modulators are used, with each one operating at a sampling rate of f(s) hence, the effective sampling rate will be M * f(s) However, SNDR is approximately equal to the single path standard structure. In this paper, a new structure based on the Noise Coupled time-interleaved delta-sigma modulator is proposed to increase the overall noise transfer function order without any additional active element. This improvement is analytically verified and then validated using simulations. Also, some practical issues regarding the implementation of the proposed structure, such as, finite op-amp's gain and mismatching effects are discussed. Also, analyzes and some practical solutions are presented. The results of the simulation at the system level show that the SNDR of the proposed first-order two-channel structure is 18 dB better than its BDF technique counterpart, for the second-order two-channel TIDSM, the SNDR of the proposed structure is 13 dB better than that of the BDF technique.
机译：基于时间交织的Delta-Sigma调制器的模数转换器是一种适用于高速ADC的方法。可以通过开发块数字滤波（BDF）技术来成功实现时间交织的Delta-Sigma调制器（TIDSM）。在该方法中，使用M相互交叉连接的Δ-Σ调制器，每次以F（s）的采样率操作，有效采样率将是m * f（s），但是，SNDR大致等于单路标准结构。在本文中，提出了一种基于噪声耦合时间交织Δ-sigma调制器的新结构，以增加没有任何附加有源元素的整体噪声传递函数顺序。在分析验证此改进，然后使用模拟验证。此外，讨论了有关实施建议结构的一些实际问题，例如有限的OP-AMP的增益和不匹配效果。此外，介绍了分析和一些实用解决方案。系统级别的模拟结果表明，对于二阶双通道TIDSM，所提出的一阶双通道结构的SNDR比其BDF技术对应于其BDF技术对应，所提出的结构的SNDR是13 dB优于BDF技术。

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