Low power adder with adaptive supply voltage

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 adoptively 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.