New technique cuts computer circuit energy needs, maintains speed New technique cuts computer circuit energy needs, maintains speed A new method could make your laptop computer battery last longer without compromising speed. The new approach holds promise for laptop and other personal computing device users worried about their batteries running down, manufacturers who want to make more complex circuits that won't melt in full operation, and wireless communication equipment developers that need dedicated circuits with lower power demands. Energy is conserved by grouping operations in the most energy efficient patterns based on their critical path delay or the time it takes to complete the operation. For example, Narayanan says, consider a circuit that includes three adders and a multiplier.
Adders have a smaller critical path delay than multipliers.
Grouping one of the fast adders with the slower multiplier allows the researchers to slow the adder down to the speed of the multiplier without slowing the overall process. To slow the adder down, the researchers supply it with a lower frequency and voltage which conserves energy. Higher voltages make signals propagate down wires faster but require more energy. The researchers have, so far, performed simulations of their approach for some benchmark circuits particularly useful for signal and image processing computer architectures. They found that, with a suitable choice of voltage levels, their approach produces an average energy saving of 53.5 percent versus the standard, static clocking scheme and single supply voltages.