Resonant clock generator for single-phase adiabatic systems

Recently discovered high-speed single-phase adiabatic logic families require efficient sinusoidal power-clock generators. In this paper we propose a low-power resonant clock-generator built around a zero-voltage switching push-pull power conversion topology. We describe a novel energy-efficient control circuit for this power converter, based on an asynchronous CMOS state machine. We also describe an integrated submicron CMOS implementation of our power converter and control circuits. Simulation results show efficiencies in excess of 90%, even under suboptimal tuning conditions, for frequencies over 200 MHz. We have fabricated our clock generator in a 0.5 μm standard CMOS process. Using an external surface-mount inductor as the resonant element, we have verified the correct operation of the clock generator when driving a single-phase adiabatic 8-bit multiplier