On Fixed-Order Filter Design for Uncertain Cascaded Sigma-Delta Modulators: a Dilated Plant Approach
學年 101
學期 1
出版（發表）日期 2012-10-01
作品名稱 On Fixed-Order Filter Design for Uncertain Cascaded Sigma-Delta Modulators: a Dilated Plant Approach
作品名稱（其他語言）
著者 Lin, Chun-chen; Chou, Yung-shan; Balakrishnan, Venkataramanan
單位 淡江大學電機工程學系
出版者 Kumamoto: ICIC International
著錄名稱、卷期、頁數 International Journal of Innovative Computing, Information and Control (IJICIC) 8(10A), pp.6761-6775
摘要 This paper presents a new method to design the digital filters for correcting uncertain 2-1 cascaded sigma-delta (ΣΔ) modulators. The main contribution of this paper consists of two parts. First, we develop a new filter design method, based on H∞ loop shaping technique, to deal with a certain weighted matching condition with polytopic uncertainties in parameters. The feature of the proposed method is to show the filter order can be independent of the weighting function and determined beforehand. Therefore, in contrast to the conventional H∞ loop shaping design method, lower-order filters can be obtained by using the proposed method. The second contribution is the application of the proposed method. For uncertain cascaded ΣΔ modulators, a low-order filter with the same order of the nominal filter is designed, which can efficiently reduce the H∞ norm of the noise transfer function in the signal frequency band. Consequently, the signal-to-noise ratio (SNR) performance is improved. We compare the proposed method with other existing designs and establish its efficacy.
關鍵字 Uncertainty; Cascaded sigma-delta modulator Reduced-order filter; Reduced-order filter; H∞ loop shaping; Linear matrix inequality
語言 en
ISSN 1349-4198
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 Lin, Chun-Chen
審稿制度 是
國別 JPN
公開徵稿
出版型式 電子版
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