A resonant clock generator for single-phase adiabatic systems

Abstract

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 sub-micron 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 200MHz. We have fabricated our clock generator in a 0.5�m 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 singlephase adiabatic 8-bit multiplier.