3D Electronic Nose Demostrates Advantages of Carbon Nanotubes

You'd think computers spend most of their time and energy doing, well, computation. But that's not the case: about 90 percent of a computer's execution time and electrical energy is spent transferring data between the processor and the memory banks, says Subhasish Mitra, a computer scientist at Stanford University. Even if Moore's law continued on indefinitely, computers would still be limited by this memory bottleneck. This week in the journal Nature, Mitra and collaborators describe a new computer architecture they say addresses this problem--and that Mitra believes will improve both the energy efficiency and speed of computers by a factor of 1000. The new 3D architecture is based on novel devices including 2 million carbon nanotube transistors and over 1 million resistive RAM cells, all built on top of a layer of silicon using existing fabrication methods and connected by densely packed metal wiring between the layers.