64-bit hybrid dual-threshold voltage power-aware conditional carry adder design

A 64-bit hybrid dual-threshold conditional-carry adder for power-aware applications was presented. Components on critical paths use a low threshold voltage to accelerate the speed of operation. Other components use the normal threshold voltage to save power. This is attractive in implementing power-aware arithmetic systems. The proposed circuit has the lowest power-delay product and energy-delay product. The hybrid circuit represents a fine compromise between power and performance. Its power efficiency is better than that of the single threshold voltage circuit designs.