研究生: |
陳喜明 Hsi-Ming Chen |
---|---|
論文名稱: |
類比數位轉換器微分非線性度補償之設計與分析 Design and analysis of ADC with A Differential Nonlinearity Compensation Circuit |
指導教授: |
周懷樸
Prof. Hwai-Pwu Chou |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 工程與系統科學系 Department of Engineering and System Science |
論文出版年: | 2004 |
畢業學年度: | 92 |
語文別: | 中文 |
論文頁數: | 95 |
中文關鍵詞: | 轉換器 、迴圈式 |
相關次數: | 點閱:2 下載:0 |
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本論文描述一個10位元二階迴圈式類比數位轉換器。並就類比數位轉換器中最重要的取樣與保值電路,以及殘值處理產生器做非線性誤差的分析,分析結果可以得到電路的開關大小對於非線性誤差有很大的影響,開關過大準確性降低,過小則速度不夠,所以必須取到最佳值,另外相位邊限必須大於60度才能避免震盪現象。類比數位轉換器模擬結果顯示其訊號雜訊比為59.099dB,微分非線性度為0.5LSB,積分非線性度為0.7LSB。由於運算放大器與開關及電容的匹配度是限制精確度的最主要因素,加入一個具有6位元slider的Sliding Scale補償電路,可以有效降低DNL,由於Sliding Scale是利用工作點分散平均法來降低微分非線性度,所以通道取樣數的多寡也會直接影響到補償效果的好壞,另外slider的數量也是另一個決定補償效果的因素,但就另一觀點來說,slider的數量越多會使得可使用的通道數目減少,可視系統需求來決定。在補償電路的模擬方面分別使用3位元及6位元的slider,所得到的微分非線性度分別為0.125LSB及0.053LSB,總括來說Sliding Scale的確可以有效降低微分非線性度,只要補償電路的誤差可以降到最低。
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