Finite-impulse-response (FIR) feedback in continuous-time delta-sigma converters
Finite-impulse-response (FIR) feedback in continuous-time delta-sigma converters
复制标题
连续时间 Delta-Sigma 转换器中的有限脉冲响应 (FIR) 反馈
DOI：
10.1109/cicc.2018.8357084
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
S. Pavan
中科院分区：
文献类型：
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作者：
S. Pavan
有限脉冲响应（FIR）反馈最初是为了解决连续时间δ - σ调制器中的环滤波器非线性和时钟抖动问题而引入的。事实证明，FIR反馈还有其他好处——它减少了量化器的数据相关抖动的影响，并允许“免费”使用斩波。它是一种体系结构技术，结合了单比特和多比特操作的优点，并且已被证明是健壮和可扩展的，适用于针对各种规范和跨流程节点的ΔΣ数据转换器。本文回顾了高性能delta-sigma数据转换器设计中遇到的主要挑战，并描述了FIR反馈在解决这些挑战中的作用。研究了利用FIR反馈实现宽带的前景，并展望了有前途的发展方向。
Finite-impulse-response (FIR) feedback was originally introduced as a way to address the problem of loopfilter nonlinearity and clock jitter in continuous-time delta-sigma modulators. It turns out that FIR feedback has other benefits — it reduces the effect of the quantizer's data-dependent jitter and enables the use of chopping “for free”. It is an architectural technique that combines the benefits of single-bit and multibit operation, and has proven itself to be robust and scalable, applicable to ΔΣ data converters targeting a variety of specifications, and across process nodes. This paper reviews the key challenges encountered in the design of high performance delta-sigma data converters, and describes the role of FIR feedback in addressing these challenges. The prospect of using FIR feedback to achieve wide bandwidths is examined, and promising directions are reviewed.