Minimum energy operation using robust asynchronous logic with sleep transistors

We demonstrate minimum energy operation using a robust approach to asynchronous logic design combined with the use of sleep transistors. The combined approach yields extremely low power and energy for a system operating in the subthreshold regime. This enables operation at voltages below those associated with the previously proposed minimum energy operating point (MEP) and therefore appreciably reduces the energy consumption compared to MEP. We also demonstrate that the robustness of our asynchronous system under Monte Carlo variations can actually yield significant additional power savings compared to a synchronous design.