Energy-Efficient Single-Layer QCA Logical Circuits Based on a Novel XOR Gate

Abstract

Quantum-dot Cellular Automata (QCA) as a nanoscale transistor-less device technology offers distinguishing advantages over the limitations of CMOS circuits. This nanoelectronic is based on the mapping of binary logic in the two excess electrons configuration within a four-dot cell. In this paper, we propose a new ultra-low energy and low-complexity two-input XOR gate which can be employed as a basic component in designing a wide range of QCA logical circuits. For performance evaluation of the presented design in a large array of QCA structures, even parity generator circuit with different lengths up to 32 bits as well as LFSR circuit are designed and analyzed as instances of logical circuits. The simulation results reveal that our proposed designs have significant improvements in contrast to counterparts from hardware implementation requirements and energy consumption aspects. QCADesigner tool is utilized to evaluate functional correctness of the proposed circuits and power dissipation is evaluated using QCAPro simulator as an accurate power estimator tool.