Dynamic VTH Scaling Scheme for Active Leakage Power Reduction

  • Authors:
  • C. Kim;K. Roy

  • Affiliations:
  • Department of Electrical and Computer Engineering, Purdue University, West Lafayette, IN;Department of Electrical and Computer Engineering, Purdue University, West Lafayette, IN

  • Venue:
  • Proceedings of the conference on Design, automation and test in Europe
  • Year:
  • 2002

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Abstract

We present a Dynamic VTH Scaling (DVTS) scheme tosave the leakage power during active mode of the circuit.The power saving strategy of DVTS is similar to that of theDynamic VDD Scaling (DVS) scheme, which adaptivelychanges the supply voltage depending on the currentworkload of the system. Instead of adjusting the supplyvoltage, DVTS controls the threshold voltage by means ofbody bias control, in order to reduce the leakage power.The power saving potential of DVTS and its impact ondynamic and leakage power when applied to futuretechnologies are discussed. Pros and cons of the DVTSsystem are dealt with in detail. Finally, a feedback loophardware for the DVTS which tracks the optimal VTH for agiven clock frequency, is proposed. Simulation results showthat 92% energy savings can be achieved with DVTS for70nm circuits.