研究生: |
李昆政 |
---|---|
論文名稱: |
低雜訊輻射偵檢器之前端訊號處理電路 Low-Noise Front End Signal Processing Electronics of the Radiation Detector |
指導教授: |
周懷樸
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: | 77 |
中文關鍵詞: | 低雜訊 、偵檢器 |
相關次數: | 點閱:1 下載:0 |
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當偵檢器電路操作在低電壓時,需小心動態範圍及雜訊干擾問題。在類比積體電路內,訊號受到二種不同雜訊干擾:元件雜訊及環境雜訊。在此本研究將集中討論元件雜訊,從雜訊之考量著手,分析元件電子雜訊對電路造成的影響,尤其以熱雜訊和閃爍雜訊對CMOS製程之電路影響更明顯。藉由電路分析找出雜訊、元件大小和功率的最佳化操作點,設計出最佳化之偵檢器前端訊號處理電路。本電路主要包含前置放大器及波形整形放大器兩部分。前置放大器主要作為雜訊匹配,由於低雜訊要求,故在前置放大器之輸入MOS元件需有非常大的通道寬長比。前置放大器以電荷靈敏放大器為主要架構,將一輸入脈衝電流轉換成一步階式電壓訊號。波形整形放大器主要功能為脈波整形,是利用微分器和積分器組成,可避免訊號產生堆疊現象,增加訊號雜訊比,其可將前置放大器的輸出訊號整形為一高斯波形,以利後續訊號處理。本電路是以TSMC 0.35um 2P4M polycide製程所提供之相關參數作為設計及模擬,最後設計出一適合偵測低能量環境輻射之偵檢器前端訊號處理電路,其等效雜訊電荷小於400e-,功率消耗約1mW,最快操作頻率為100KHz。
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