Single Electron Quantum-Dot Cellular Automata, A Novel Device for Nano Scale Computations

摘要

New generation of nanoelectronic computing devices has arrived, since the blocked path of channel length diminution for conventional Complementary-Metal-Oxide-Semiconductor (CMOS) technology. Quantum-dot cellular automata (QCA) is considered as one of these promising technologies, whichis based upon the mapping of binary logic in the two excess electrons configuration within a four-dot cell. In this paper, we propose a novel four-dot cell with only one excess electron that demonstrates useful properties in designing various circuits. Despite other cell manipulating methods,the same physical design and switching rules are levered. Single electron cells (SE cells) are used as transient cells in order to improve the circuit functionalities by smaller area, lower power consumption, and faster design. As a result of applying these cells on inverter and majority gatesas basic components of QCA logics, a well-optimized designs with minimum cell numbers designs are proposed. Accordingly based on the fundamental and significant role of full adder modules in digital systems, a novel efficient full adder is presented as well. Correctness of functionality andthe efficiency of proposed structures are proved in comparison to state-of-the-art designs using physical proofs.