Cascaded feedforward sigma-delta modulator for wide bandwidth applications
學年 90
學期 1
出版（發表）日期 2001-10-01
作品名稱 Cascaded feedforward sigma-delta modulator for wide bandwidth applications
作品名稱（其他語言）
著者 江正雄; Chiang, Jen-Shiun; Chang, Teng-Hung; Chou, Pou-Chu
單位 淡江大學電機工程學系
出版者 臺北縣：淡江大學
著錄名稱、卷期、頁數 淡江理工學刊=Tamkang journal of science and engineering 4(3)，頁155-165
摘要 A new sigma-delta modulator architecture for wide bandwidth application called cascaded feedforward sigma-delta modulator is proposed in this paper. This sigma-delta modulator is similar to the conventional feedforward summation sigma-delta modulator. The conventional feedforward summation sigma-delta modulator uses multi-bit feedback and therefore a multi-bit digital-to-analog converter (DAC) is needed. Due to the nonlinearity of the multi-bit DAC, it is difficult to be implemented. On the other hand the proposed approach uses 1.5-bit feedback, and thus the implementation of the analog part is much easier than the conventional one. Since the 1.5-bit feedback will cause coarse quantization errors, error cancellation must be done in the digital part. Here an adaptive filter with least mean square algorithm is used to reduce the nonlinear effect. The simulation results show that the signal to noise plus distortion ratio (SNDR) of this architecture is very close to that of the ideal feedforward summation sigma-delta modulator with multi-bit DAC and can be used for the wide bandwidth application.
關鍵字
語言 en
ISSN 1560-6686
期刊性質 國內
收錄於
產學合作
通訊作者
審稿制度 否
國別 TWN
公開徵稿
出版型式 ,電子版
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