Abstract
Demands for the low power VLSI have been pushing the development of aggressive design methodologies to reduce the power consumption drastically. To meet the growing demand, we propose a low power adder, which adaptively selects supply voltages based on the input vector patterns. We prototyped a 32-bit Ripple Carry Adder and analyzed the power consumption and performance in details. Results show 29% improvement in power consumption over a conventional ripple carry adder with comparable performance.