A square root unscented Kalman filter for estimating DAC and loopfilter nonidealities in continuous-time sigma-delta modulators
A square root unscented Kalman filter for estimating DAC and loopfilter nonidealities in continuous-time sigma-delta modulators
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DOI：
10.1109/iscas.2014.6865346
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
Matthias Lorenz;Timon Brückner;R. Ritter;J. Anders;M. Ortmanns
中科院分区：
文献类型：
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作者：
Matthias Lorenz;Timon Brückner;R. Ritter;J. Anders;M. Ortmanns
在这项工作中，具有改进的数值特性的无迹卡尔曼滤波被证明能够同时估计连续时间Sigma-Delta调制器的主要非理想性。已知Sigma-Delta调制器中的电路缺陷(例如，反馈数模转换器中的非线性)会极大地降低调制器的性能。现有技术显示了几种技术来补偿这些非理想性中的一些，其中大多数方法只关注单个参数或只能应用于特定的调制器结构。该方法能够同时估计最严重的非理想电路参数，而不局限于特定的调制器结构。
In this work, an unscented Kalman filter with improved numerical properties is shown to be able to simultaneously estimate the major nonidealities of continuous-time sigma-delta modulators. Circuit imperfections in sigma-delta modulators like, e.g., nonlinearities in the feedback digital-to-analog converters are known to highly reduce the modulators's performance. The state of the art shows several techniques to compensate for some of these nonidealities, whereby most of the methods only focus on single parameters or can only be applied to specific modulator structures. The presented method is capable of estimating the most serious nonideal circuit parameters concurrently whilst not being limited to specific modulator structures.