Design of Quantum-Dot Cellular Automata-Based Shift Register Circuit using D-Flip Flop

Abstract

With the rising adoption of quantum-dot cellular automata (QCA) nanotechnology, nanoscale digital circuits offer numerous advantages over traditional CMOS devices, such as lower power consumption, enhanced processing speed, and higher density. Various flip-flop designs have been proposed in the literature for implementation using QCA technology. However, many of these designs face challenges such as high cell counts, significant area usage, and latency, resulting in increased circuit costs. To address these issues, this work surveys existing literature on D flip-flop (DFF) designs and the complex sequential circuits that can be constructed from them. A new Shift Register design was proposed in this study. To evaluate its performance, an extensive comparison with existing QCA designs was conducted.