Excess Loop Delay Compensation Technique For Tunable Bandpass Delta Sigma Modulators

被引：6
|
作者：
Afifi, M. [1 ]
Keller, M. [1 ]
Manoli, Y. [1 ]
Ortmanns, M. [2 ]
机构：
[1] Univ Freiburg, IMTEK, Chair Microelect, Freiburg, Germany
[2] Univ Ulm, Inst Microelect, Ulm, Germany
来源：
2009 52ND IEEE INTERNATIONAL MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1 AND 2 | 2009年
关键词：
D O I：
10.1109/MWSCAS.2009.5236078
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
Excess loop delay is one of the most critical problems in continuous-time delta-sigma modulators as it leads to SNR degradation and even system instability. This paper discusses the effect of excess loop delay on a tunable continuous-time bandpass modulator, both analytically and by simulations. Furthermore, it suggests a simple compensation technique for the excess loop delay that preserves the modulator stability with a delay of one period. It is shown that the compensation achieves almost the ideal SNR of the modulator.
引用
收藏
页码：365 / +
页数：2
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