Global and local properties of asynchronous circuits optimized for energy efficiency

In this paper we explore global and local properties of asynchronous circuits sized for the energy efficiency metric Et^2. We develop a theory that enables an abstract view on transistor sizing. These results allow us to accurately estimate circuit performance and compare circuit design choices at logic gate level without going through the costly sizing process. We estimate that the improvement in energy efficiency due to sizing is 2 to 3.5 times when compared to a design optimized for speed.