A New Technique for Jointly Optimizing Gate Sizing and Supply Voltage in Ultra-Low Energy Circuits

Mobile applications with battery lifetimes on the order of thousands of days have placed stringent energy requirements on circuits. In this paper, we propose a new energy optimization technique for ultra-low energy circuits operating in the subthreshold regime. Our technique uses simultaneous gate sizing and supply voltage scaling to reduce energy. We demonstrate the effectiveness of our technique on benchmark circuits and offer insight on the roles of the timing distribution and wire capacitance in determining the achievable energy reductions.