A Necessary and Sufficient Condition of Supply and Threshold Voltages in CMOS Circuits for Minimum Energy Point Operation

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Author(s)

    • SHIOMI Jun
    • Department of Communications and Computer Engineering, Kyoto University
    • ISHIHARA Tohru
    • Department of Communications and Computer Engineering, Kyoto University

Abstract

<p>Scaling supply voltage (<i>V</i><sub>DD</sub>) and threshold voltage (<i>V</i><sub>th</sub>) dynamically has a strong impact on energy efficiency of CMOS LSI circuits. Techniques for optimizing <i>V</i><sub>DD</sub> and <i>V</i><sub>th</sub> simultaneously under dynamic workloads are thus widely investigated over the past 15 years. In this paper, we refer to the optimum pair of <i>V</i><sub>DD</sub> and <i>V</i><sub>th</sub>, which minimizes the energy consumption of a circuit under a specific performance constraint, as a minimum energy point (MEP). Based on the simple transregional models of a CMOS circuit, this paper derives a simple necessary and sufficient condition for the MEP operation. The simple condition helps find the MEP of CMOS circuits. Measurement results using standard-cell based memories (SCMs) fabricated in a 65-nm process technology also validate the condition derived in this paper.</p>

Journal

  • IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E100.A(12), 2764-2775, 2017

    The Institute of Electronics, Information and Communication Engineers

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