Design of fault tolerant bifunctional parity generator and scalable code converters based on QCA technology

Abstract

In this paper, we focus on novel designs for digital code converter and parity generator circuits in quantum-dot cellular automata (QCA) technology, which is transistor less computation approach and encodes binary information through the configuration of charges among quantum dots. In existing works, code converters and parity generators have been designed using majority gate and inverter-based XOR gates that is the basic structure of these circuits. However, our proposed designs use explicit cell interaction-based XOR gate to designing a compact form of QCA circuits. As a result, novel designs for generating parity bit, Binary to Gray, Gray to Binary code converter are presented with low complexity. Moreover, we will first demonstrate the bifunctional parity generator in QCA. The correct operation of the structures has been verified using the QCADesigner tool. A structural comparison was made with previous works and found that the proposed designs have significant improvements over existing ones. © 2021, Bharati Vidyapeeth's Institute of Computer Applications and Management.