Time-Continuous Delta-Sigma A/D Converters: From Theory to Practical Implementation
Time-Continuous Delta-Sigma A/D Converters: From Theory to Practical Implementation
复制标题
DOI：
10.1109/aspcas.2006.251126
复制
发表时间：
2006-05
期刊：
影响因子：
--
通讯作者：
A. Buhmann;M. Keller;M. Ortmanns;F. Gerfers;Y. Manoli
中科院分区：
文献类型：
--
作者：
A. Buhmann;M. Keller;M. Ortmanns;F. Gerfers;Y. Manoli
delta-sigma A/D转换的概念是众所周知的在低到中带宽应用中实现高分辨率A/D转换器的一种非常有效的技术。虽然大多数是通过开关电容技术实现的，因此在过去是离散时间电路，但连续时间电路已成为实现当今不断增长的带宽应用的标准。因此，本章简要总结了CT δ - σ调制器的关键方面，并通过最近的CT实现进行了说明。涵盖了噪声整形转换器的功能，基带应用的典型单级和多级架构及其隐式抗混叠特性以及电路非理想性的影响和补偿，例如级联调制器中的抖动过量环路延迟或系数失配
The concept of delta-sigma A/D conversion is well known as a very efficient technique for the implementation of high resolution A/D converters in low to medium bandwidth applications. While mostly implemented by means of the switched-capacitor technique and thus as discrete time circuits in the past, continuous-time circuitry becomes the standard for the implementation of today's ever-growing bandwidth applications. A brief summary of the key aspects of CT delta-sigma modulators is therefore given in this chapter, illustrated by recent CT implementations. Covered are the functionality of noise shaping converters, typical single-stage and multi-stage architectures for baseband applications and their implicit anti-aliasing feature and the influence and compensation of circuit non-idealities, e.g. jitter excess loop delay or coefficient mismatch in cascaded modulators