Analysis of digital gain error compensation in continuous-time cascaded Sigma-Delta modulators

被引：1

作者：

Keller, Matthias ^{[1
]}

Buhmann, Alexander ^{[1
]}

Ortmanns, Maurits ^{[1
]}

Manoli, Yiannos ^{[1
]}

机构：

[1] Univ Freiburg, Dept Microsyst Engn IMTEK, Chair Microelect, D-79110 Freiburg, Germany

来源：

PROCEEDINGS OF 2008 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1-10 | 2008年

关键词：

D O I：

10.1109/ISCAS.2008.4541807

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

This paper deals with an in-depth analysis of digital gain error compensation in continuous-time cascaded Sigma-Delta modulators. Illustrated by the example of a 2-1 cascaded modulator, it will be shown that this approach always restores the desired noise-shaping characteristic in cases where, except for the first stage, only first-order modulators are used in the cascade. However, a leakage term still exists which may increase the total in-band noise in case the first integrator of any stage in the cascade exhibits a gain variation. For any other architecture, the digital correction approach fails to truly compensate for gain errors as illustrated by the example of a 2-2 cascaded modulator. Low-order shaped quantization noise may then still determine the total in-band noise.(1)

引用

页码：1874 / 1877

页数：4

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