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An elegant hardware-corroborated statistical repair and test methodology for conquering aging effects

Published: 02 November 2009 Publication History

Abstract

We propose a new and efficient statistical-simulation-based test methodology for optimally selecting repair elements at beginning-of-life (BOL) to improve the end-of-life (EOL) functionality of memory designs. This is achieved by identifying the best BOL test/repair corner that maximizes EOL yield, thereby exploiting redundancy to optimize EOL operability with minimal BOL yield loss. The statistical approach makes it possible to identify such corners with tremendous savings in terms of test time and hardware. To estimate yields and search for the best repair corner the approach relies on fast conditional importance sampling statistical simulations. The methodology is versatile and can handle complex aging effects with asymmetrical distributions. Results are demonstrated on state-of-the-art dual-supply memory designs subject to statistical negative bias temperature instability (NBTI) effects, and hardware results are shown to match predicted model trends.

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    cover image ACM Conferences
    ICCAD '09: Proceedings of the 2009 International Conference on Computer-Aided Design
    November 2009
    803 pages
    ISBN:9781605588001
    DOI:10.1145/1687399
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    Published: 02 November 2009

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    Author Tags

    1. NBTI
    2. SRAM
    3. memory repair and test
    4. probability
    5. redundancy
    6. statistical performance
    7. yield prediction

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