研究生: |
陳帥帆 Shuai-Fan Chen |
---|---|
論文名稱: |
快閃記憶體操作與可靠度分析研究 Programming/Erase Operation and Reliability of Flash Memory |
指導教授: |
張廖貴術
Kuei-Shu Chang-Liao |
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: | 2002 |
畢業學年度: | 90 |
語文別: | 中文 |
論文頁數: | 95 |
中文關鍵詞: | 快閃記憶體 、可靠度 |
外文關鍵詞: | Flash Memory, Reliability |
相關次數: | 點閱:3 下載:0 |
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快閃記體身為非揮發記憶體,強調的是資料的保存,因此可靠度的特性相對非常重要。造成可靠度衰退的原因主要是在寫入與擦拭過程中,有大量的電子必須來回穿隧氧化層,造成氧化層受到傷害越來越嚴重,導致元件的老化而損壞。
在本篇論文中研究嘗試利用漸增式寫入法改善快閃記憶體閘極氧化層受到寫入操作的傷害,結果發現:1.漸增式寫入臨界電壓改變較小但能接受。2.閘極干擾比傳統方波小。3.汲極干擾比傳統方波與自然指數上升波輕微。4.讀取干擾都很微弱以及50、70%的漸增波的讀取干擾較小。5.自然指數上升波形寫入可以有效的減少閘極干擾造成的臨界電壓改變。6.漸增式寫入臨界電壓改變會漸漸降低。7.本篇論文中所使用的寫入操作方式,汲極干擾對臨界電壓的影響皆很大,而且並沒有得到明顯改善。
另外對擦拭法的改進利用二階段擦拭法,也就是在傳統擦拭過程後,加入一次輕微寫入的動作。二階段擦拭對元件的耐力能夠有效的提升,也能夠有效減少閘極干擾對臨界電壓的改變。同時避免過度擦拭造成記憶體陣列漏電的錯誤,可以有效集中擦拭後的臨界電壓分布,這對未來發展有很大的幫助。
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