Three-dimensional Logic Architecture by Four-terminal Electrical Switches (FES) beyond Two-dimensional CMOS Architecture

We have proposed a new concept of 3D architecture using four-terminal electrical switches (FES), which can replace CMOS logic without self-organized bottom-up process. Ultra high speed FES can be realized by nanoscale electrical mechanical system based on carbon nanotube. Nonvolatile FES can also be realized by modifying twoterminal nonvolatile memory devices, such as solid electrolyte memory using chalcogenide phase change memory. All kinds of CMOS logic can be built by 3Dstacked FES logic gates with a smaller number of devices compared to that in the case of CMOS. Also, due to 3D, far wider parallel data path can be used than that for 2DCMOS logic. Logic data can flow not only horizontally but also vertically in the case of 3D circuit of FES. Thus 3D FES logic architecture has a strong possibility of becoming superior to CMOS logic in future.