Analysis of Body Bias Control Using Overhead Conditions for Real Time Systems: A Practical Approach

Carlos Cesar CORTES TORRES  Hayate OKUHARA  Nobuyuki YAMASAKI  Hideharu AMANO  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E101-D   No.4   pp.1116-1125
Publication Date: 2018/04/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2017EDP7258
Type of Manuscript: PAPER
Category: Computer System
Keyword: 
silicon-on-insulator,  SOTB,  body bias,  low power design,  time-overhead,  energy-overhead,  

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Summary: 
In the past decade, real-time systems (RTSs), which must maintain time constraints to avoid catastrophic consequences, have been widely introduced into various embedded systems and Internet of Things (IoTs). The RTSs are required to be energy efficient as they are used in embedded devices in which battery life is important. In this study, we investigated the RTS energy efficiency by analyzing the ability of body bias (BB) in providing a satisfying tradeoff between performance and energy. We propose a practical and realistic model that includes the BB energy and timing overhead in addition to idle region analysis. This study was conducted using accurate parameters extracted from a real chip using silicon on thin box (SOTB) technology. By using the BB control based on the proposed model, about 34% energy reduction was achieved.