Designing and Implementing a Fault-Tolerant Priority Encoder in QCA Nanotechnology

Abstract

The quantum-dot cellular automata (QCA) is a new and impressive nano-technology for implementing electronic circuits at nanoscale. This nanotechnology is more impressive than CMOS technology in terms of higher speed, smaller area and less energy consumption, and can make significant progress in the design of logic circuits. quantum-dot cellular automata circuits are likely to have various defects during fabrication. In fabrication process, some different defects might be occurred (like cell deletion, cell addition, cell displacement, cell rotation, and misalignment). That’s why researchers are eager to design fault-tolerant circuits. In this paper, a fault-tolerant priority encoder is designed. For this purpose, a new fault tolerant majority gate is provided first. The results of simulations are shown with the QCADesigner software V2.0.3. The simulation results indicate an improvement in the performance of the proposed structure.