Elimination of Static Hazards in Asynchronous Sequential Circuits using Quantum dot Cellular Automata

TL;DR

This paper explores eliminating static hazards in asynchronous sequential circuits using Quantum-dot Cellular Automata (QCA), comparing hazard-free and hazard-prone designs based on kink energy, verified through simulation.

Contribution

It introduces a hazard-free design approach for QCA circuits and compares it with hazard-prone designs, filling a gap in hazard analysis for emerging QCA technology.

Findings

Hazard-free circuits have lower kink energy than hazard-prone ones.

Simulation confirms the effectiveness of the hazard-free design.

QCADesigner successfully verifies the proposed circuits.

Abstract

There is nowhere else in emerging technology, but in Quantum-dot Cellular Automata, one can find high speed, low power operation, and high packaging density, which deals with electrostatic interaction between electrons within a cell. Literature survey lacks in hazards free design of QCA circuit. Hazards create ambiguous and unpredictable output, which can be avoided. This work considers both hazards and hazards-free asynchronous sequential circuits; both are compared in terms of kink energy, and a better one has been proposed. The circuit simulation has been verified in the QCADesigner tool.