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Process Variation Estimation using Flip-Flop Retention Characteristics

Research Project

Project/Area Number 17K12657
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Computer system
Research InstitutionFukuoka University (2019)
Saitama University (2017-2018)

Principal Investigator

Nishizawa Shinichi  福岡大学, 工学部, 助教 (40757522)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsフリップフロップ / 記憶保持特性 / ばらつき評価回路 / トランジスタ特性ばらつき / プロセスモニタ / 集積回路 / ばらつきモニタ / テスト / BIST
Outline of Final Research Achievements

Extraction method of process variation has been proposed. Retention characteristics of DFF is newly introduced to the process variation estimation since it has a good sensitivity to the balance of pfet and nfet. Proposed technique can utilize scan-chains designed for scan-tests, thus this technique has an ability to extract the amount of process variation without adding extra test purpose circuit.
Test structures are implemented into silicon chips and result shows the proposed technique can estimate global variation shift from measured data.

Academic Significance and Societal Importance of the Research Achievements

集積回路は今日の情報化社会を支える基幹部品であり,高性能化,省電力化,低価格化が強く望まれている.そのため集積回路の製造プロセスの微細化が急激に進められてきたが製造工程の複雑化によって製造プロセスに起因するトランジスタ特性ばらつきが問題となっている.ばらつき量はチップごとの異なるため,個々のチップのばらつき量を評価する事で電源電圧および基板電圧を調節しばらつきを補償する事が可能である.ばらつき量の測定のために測定回路を追加する事は集積回路のコストを増大させる課題がある.
本技術は既存の構造をばらつき量推定に利用する事で,追加コスト無く個々のチップのばらつき量の推定を可能にする.

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (4 results)

All 2020 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Design Methodology for Variation Tolerant D-Flip-Flop Using Regression Analysis2018

    • Author(s)
      NISHIZAWA Shinichi、ONODERA Hidetoshi
    • Journal Title

      IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

      Volume: E101.A Issue: 12 Pages: 2222-2230

    • DOI

      10.1587/transfun.E101.A.2222

    • NAID

      130007539015

    • ISSN
      0916-8508, 1745-1337
    • Year and Date
      2018-12-01
    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Process Variation Estimation using An IDDQ Test and FlipFlop Retention Characteristics2020

    • Author(s)
      Shinichi Nishizawa,and Kazuhito Ito
    • Organizer
      International Conference on Microelectronic Test Structures
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Process Variation Estimation using A Combination of Ring Oscillator Delay and FlipFlop Retention Characteristics2018

    • Author(s)
      Takuma Konno, Shinichi Nishizawa and Kazuhito Ito
    • Organizer
      International Conference on Microelectronic Test Structures
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Process Variation Aware D-Flip-Flop Design using Regression Analysis2018

    • Author(s)
      Shinichi Nishizawa and Hidetoshi Onodera
    • Organizer
      International Symposium on Quality Electronic Design
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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