教師資料查詢 | 類別: 期刊論文 | 教師: 江正雄 CHIANG JEN-SHIUN (瀏覽個人網頁)

標題:A Wideband Cascaded Sigma-Delta Modulator with Improved Non-linearity Effects
學年
學期
出版(發表)日期2003/08/01
作品名稱A Wideband Cascaded Sigma-Delta Modulator with Improved Non-linearity Effects
作品名稱(其他語言)
著者江正雄; Chiang, Jen-shiun; Chou, Pao-chu; Chang, Teng-hung
單位淡江大學電機工程學系
出版者
著錄名稱、卷期、頁數International Journal of Electronics 90(4), pp.255-275
摘要This work presents a wideband cascaded sigma-delta modulator (CLFSDM) that reduces the nonlinearity effects of components. This architecture offers a new noise-shaping function to achieve high resolution in wideband applications and reduce digital-analogue converter (DAC) mismatch from the multi-bit feedback. Moreover, the error cancellation schemes can be added in the digital circuit part to cancel the coarse quantization errors and thus effectively reduce the non-ideal effects such as DAC mismatch. The mismatches between the two stages, such as in the gain error and pole error, may seriously degrade performance. The blind on-line calibration technique is used to eliminate these imperfect analogue circuit errors in the digital circuit. Accordingly, this architecture can reduce the over sampling ratio (OSR), and the in-band noise can be significantly suppressed to achieve a high resolution in Matlab and Switcap2 simulations. Simulation results indicate this sigma-delta modulator is very efficient in wide bandwidth applications.
關鍵字
語言英文
ISSN
期刊性質國內
收錄於
產學合作
通訊作者
審稿制度
國別中華民國
公開徵稿
出版型式,電子版
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