Optimal Voltages and Sizing for Low Power

  • Authors:
  • Mircea R. Stan

  • Affiliations:
  • -

  • Venue:
  • VLSID '99 Proceedings of the 12th International Conference on VLSI Design - 'VLSI for the Information Appliance'
  • Year:
  • 1999

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Abstract

We provide a unified first-order analysis of optimal voltage scaling and transistor sizing for minimum energy-delay product. Based on such calculations we show that a circuit design style with separate logic and buffer improves the energy-delay product by almost an order of magnitude in the presence of interconnect parasitics. We also show that the power supply voltage for minimum energy-delay product is slightly larger than two times the optimal threshold voltage Vth and the ratio of AC power and DC power for minimum energy-delay product is approximately two thirds of the optimal ratio of Vth and the thermal voltage VT.