A Heuristic Finite Frequency H-infinity Filtering Technique with Application to Cascaded 2-1 Sigma-Delta Modulators
學年 98
學期 2
發表日期 2010-07-01
作品名稱 A Heuristic Finite Frequency H-infinity Filtering Technique with Application to Cascaded 2-1 Sigma-Delta Modulators
作品名稱（其他語言）
著者 Chou, Yung-shan; Lin, Chun-chen; Chang, Yun-lun
作品所屬單位 淡江大學電機工程學系
出版者 IEEE
會議名稱 2010 International Conference on System Science and Engineering (ICSSE)
會議地點 Taipei, Taiwan
摘要 Due to limited accuracy of the modern fabrication technologies, cascaded sigma-delta modulators could suffer from finite amplifier gain and capacitor mismatch. Unfortunately, these non-ideal analog components cause inevitable mismatch of the analog circuits and digital noise cancellation filters; consequently it leads to a poor signal-to-noise ratio (SNR). In this paper, the SNR performance enhancement problem is formulated as a robust H-infinity filtering problem in finite frequency domain. Specifically, we propose a heuristic finite impulse response (FIR) filter design that deals with the problem by treating the non-ideality as parametric uncertainty in the integrators' pole and zero of the modulators. In contrast with the existing approaches, the proposed design is a direct approach which directly adjusts the gain responses of the noise transfer function to yield high-order noise shaping by searching the coefficients of FIR filters via solving linear matrix inequality (LMI) feasibility problems. We have confirmed the validity of the proposed method via simulations of a cascaded 2-1 modulator with 2% deviation in the analog integrators. Simulation results show that the modulator matched by the proposed filter achieves better SNR performance than that matched by the conventional one.
關鍵字
語言 en_US
收錄於
會議性質 國際
校內研討會地點
研討會時間 20100701~20100703
通訊作者
國別 TWN
公開徵稿 Y
出版型式 紙本
出處 2010 International Conference on System Science and Engineering (ICSSE),p.p401 - 406
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