研究生: |
高赫聲 Ho-Sheng Kao |
---|---|
論文名稱: |
無線晶圓測試的成本估計 Test Cost Estimation for Wireless Wafer Test |
指導教授: |
張慶元
Tsin-Yuan Chang |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
電機資訊學院 - 電機工程學系 Department of Electrical Engineering |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 英文 |
論文頁數: | 52 |
中文關鍵詞: | 無線 、晶圓測試 、成本估計 |
外文關鍵詞: | wireless, wafer test, cost estimation |
相關次數: | 點閱:3 下載:0 |
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在測試階段中,測試成本與測試精確度是必須考量的問題。但隨著製程技術迅速地進步,許多的晶片可以整合到同一顆系統晶片內,使得測試面臨極度的挑戰。因為晶片速度提昇太快,現在大部分的晶片在測試時都無法操作在工作頻率,這將增加與時間相關錯誤機率的發生。另外接腳的密度與數量增加使得探針卡製作的難度與成本顯著提高。
后羿(HOY)計劃觀念近幾年被提了出來,它主要是針對傳統測試產生的種種問題而提出改良。后羿(HOY)觀念使用無線通訊的技術,將測試信號經由無線的方式傳送到待測晶片進行測試,如此可解決逐漸增加的晶片接腳密度與縮小的接腳大小問題,另外測試頻率的提高、測試時間的縮短等等優點,使后羿無線測試觀念擁有極大地魅力。
本篇論文以后羿(HOY)觀念為基礎修改前人所提出的成本模型,此模型是針對無內建自我測試電路的晶片所開發出的模型,它可以對三種測試方法進行評估,傳統測試方法、無辨識碼(ID)之無線測試方法與有辨識碼(ID)之無線測試方法。雖然說是使用無線測試,但只有輸入與輸出信號使用無線技術傳送資料,電源(clock)與時脈(clock)仍假設須經由探針卡來提供。經過評估之後,HOY無線測試方法可以大幅降低測試成本,又后羿(HOY)平行測試的個數比傳統測試多,所以測試一片晶圓花費的時間較少,單位時間內可測試的晶片較多,因此可獲得的利潤也較高。
Test cost and test accuracy are the issues that must be considered in the stage of testing. Many dies can be integrated into single chip with the advancement of integrated circuit fabrication technology, but it makes the testing face stern challenges. Because the speed of chip increases too fast such that some chips can not be tested at operation frequency, it will raise the possibility of time-related faults. The higher density and greater amount of pads make the manufacture of probe cards more difficult and more expensive than past.
HOY wireless test concept was proposed recently. It provides the improved test method due to plenty problems of traditional test. HOY concept is that test data are transmitted to DUT by using wireless communication technology. Therefore, the issues of pad density and pad size can be solved. Besides, the advantages such as improving test frequency and reduced test time etc. make the HOY wireless test attractive.
This thesis proposes the cost model by modifying the model in bibliography based on HOY concept. The proposed model is constructed for most of ASIC without BIST and it can estimate three types of test methods: traditional test, wireless test without ID, and wireless test with ID. Moreover, only the I/O signals are transmitted wirelessly and the power and clocks are still transmitted though the probe cards. After estimation, HOY wireless test method can save test cost enormously. In addition, the maximum number of parallel tests for wireless test is larger than that for traditional test, so the test time of wireless test is shorter than that of traditional test. That means that a wireless ATE can test more dies and obtain more profit.
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