Wideband Continuous-Time MASH ADCs: Principles, Challenges, and Prospects

IEEE Open Journal of the Solid-State Circuits Society Pub Date : 2025-02-19 DOI:10.1109/OJSSCS.2025.3543761

Ke Li;Liang Qi;Mingqiang Guo;Rui P. Martins;Sai-Weng Sin

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Abstract

Continuous-time (CT) delta-sigma modulator (DSM) is a popular choice for its inherent aliasing and resistive input impedance characteristics. With the increased demands for wide-bandwidth (BW) and high-dynamic range (DR), multistage noise shaping (MASH) presents prominent benefits of high-order noise-shaping (NS) without being constrained by

$\Delta \Sigma $

loop stability issues. Recent literature on CT MASH DSM showed promising progress in overcoming the design challenges under wideband application, including signal and quantization leakage, analog-digital matching complexity, signal transfer function (STF) peaking, and high-speed excess loop delay (ELD) compensation. This review article introduces fundamental models and primary design considerations, then discusses the CT MASH DSM’s key challenges and corresponding solutions. Finally, we provide two implementation examples of this architecture with their highlights and challenges.

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宽带连续时间MASH adc：原理、挑战和前景

连续时间(CT) δ - σ调制器（DSM）由于其固有的混叠和电阻性输入阻抗特性而成为一种流行的选择。随着对宽带（BW）和高动态范围（DR）需求的增加，多级噪声整形（MASH）表现出高阶噪声整形（NS）的突出优点，而不受$\Delta \Sigma $回路稳定性问题的限制。最近关于CT MASH DSM的文献显示，在克服宽带应用下的设计挑战方面取得了有希望的进展，包括信号和量化泄漏、模数匹配复杂性、信号传递函数（STF）峰值和高速过量环路延迟（ELD）补偿。这篇综述文章介绍了基本模型和主要设计考虑，然后讨论了CT MASH DSM的主要挑战和相应的解决方案。最后，我们提供了该体系结构的两个实现示例，以及它们的亮点和挑战。

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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IEEE Open Journal of the Solid-State Circuits Society

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