Design of Octal to Binary Encoder using QCA

Abstract

Advancements in the field of science and technology imparts the world to become smarter and scaling the hardware to a nano scale. This is being employed in the stream of applications regarding the design and fabrication of CMOS transistors per square centimetre. Several researches are on-going to reduce the CMOS technological applications to a smaller scale i.e., up to nano scale. In this drive this scaling is being made possible in this field with the evolution of quantum dots which has further lead to the concept of quantum dot cellular automata (QCA) from the knowledge of it. This paper presents the fundamental concepts regarding QCA which may also include basic cell and its types, majority gate, types and its usage, inverter and its type, clocking criteria. This paper proposes a design of octal to binary encoder with minimum possible crossovers consisting of nine (3 input) majority gates with 211 cells employing all the fundamental concepts discussed and its simulation results using related QCA designer tool.