Heuristic finite-impulse-response filter design for cascaded ΣΔ modulators with finite amplifier gain
學年 100
學期 2
出版（發表）日期 2012-07-01
作品名稱 Heuristic finite-impulse-response filter design for cascaded ΣΔ modulators with finite amplifier gain
作品名稱（其他語言）
著者 Chou, Yung-Shan; Lin, Chun-Chen; Chen, Hsin-Liang; Chiang, Jen-Shiun
單位 淡江大學電機工程學系
出版者 Stevenage: The Institution of Engineering and Technology
著錄名稱、卷期、頁數 IET Circuits, Devices & Systems 6(4), p.235-245
摘要 This study addresses a new digital calibration filter design for cascaded ΣΔ modulators with finite amplifier gain. A recent approach based on the H-infinity loop shaping method to this problem has the merit of obviating the use of an estimation or adaptive digital correction scheme, which thus reduces the complexity of circuit implementation. For the approach to be successful, it is critical to find an appropriate weighting function so as to make the gain responses of the uncertain noise transfer function (NTF) in a proper shape for improving signal-to-noise ratio (SNR). However, the search of such a weighting function is difficult in general. Moreover, the introduced weighting function increases filter order and hence circuit complexity. To circumvent this difficulty and the inherited drawbacks, this study presents a new noise shaping method for the problem. Considering that it is hard to decide the optimal shape of the uncertain NTF a priori, the authors propose a dual-band design to achieve the shape adjustment task. In particular, the range of lower frequency band is determined by SNR performance evaluation rather than being arbitrarily given a priori. This step is crucial and increases the chance of finding a better filter.
關鍵字 FIR filters;calibration;sigma-delta modulation;transfer functions;circuit complexity;amplifiers
語言 en
ISSN 1751-858X
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 GBR
公開徵稿
出版型式 ,電子版,紙本
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