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| 研究生： |
鄭昌杰 Cheng, Chang-Chieh |
|---|---|
| 論文名稱： |
具有偵測讀取漏電流且有製程、電壓、溫度變異容忍性與高功率效益之次臨界電壓隨機存取記憶體 A PVT-Variation Tolerant and High Power-Efficient Sub-threshold SRAMs with Read Leakage Sensing |
| 指導教授： |
邱瀝毅
Chiou, Lih-yih |
| 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： | 2014 |
| 畢業學年度： | 102 |
| 語文別： | 英文 |
| 論文頁數： | 68 |
| 中文關鍵詞： | 隨機存取記憶體 、次臨界電壓 、低功率 、變異 、維持電路 |
| 外文關鍵詞： | SRAM, sub-threshold voltage, low power, variation, keeper |
| 相關次數： | 點閱：62 下載：0 |
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在無線感測網路的應用中，功率消耗為重要的考量之一，為了延長這些應用的使用時間，會需要低功率的系統晶片，而在這些系統晶片的功率消耗中，又以隨機存取記憶體佔極大部分，為了能夠降低功率消耗，至今已經提出了許多低功率技巧，其中調降電壓至近臨界電壓或次臨界電壓為非常有效的方法之一，然而在近臨界電壓及次臨界電壓的操作中，會遭遇更嚴重的變異。以去耦讀取埠的隨機存取記憶體而言，在進行讀取時，會因為變異使得漏電流與維持電路電流的比例有大幅度變動導致產生讀取錯誤。在本篇論文中，為解決這些變異造成的讀取錯誤，提出了本地欄位偵測維持電路來偵測變異，並自適應性的產生維持電路電流，使次臨界電壓操作的讀取能夠正確，同時藉由降低讀取時的抵抗電流來達到降低功率消耗的優勢。本論文提出的電路以台積電90奈米製程下線並做佈局後模擬驗證，能將操作電壓降低至近臨界與次臨界電壓，並與現今的技術相比，在漏電流最大的情況能降低24%的功率。
Power consumption is one of important issues in power constraint applications such as wireless sensor networks (WSN). For these power constraint applications, we need a low power system-on-a-chip (SoC) to extend life time. In breakdown of power consumption, SRAMs are one of major sources of power consumption in the SoC. Scaling supply voltage into near-threshold or sub-threshold region is one of effective techniques to reduce power consumption. However, severe variations may occur in the near-threshold and the sub-threshold region. For a read-decoupled SRAM, read failures may happen because the current ratio between a keeper and a pull-down network has large variations. In this thesis, we propose a local column sensing keeper scheme to detect the variations and adaptively generate a proper keeper current to deal with the read functionality issues. Meanwhile, power consumption is reduced by minimizing the keeper contention current. A test chip is fabricated using TSMC 90nm technology to demonstrate the proposed SRAM. According to post-layout simulation results, the proposed scheme supports near-threshold and sub-threshold operation and achieves 24% power reduction when compared with state-of-the-art designs in the worst leakage case.
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校內：2019-09-10公開校外：不公開