Reversible Logic Gates Using Quantum Dot Cellular Automata (QCA) Nanotechnology
Vijay Kumar Sharma · 2023
Power dissipation is the key factor that is considered while designing low-power circuits. Complementary metal oxide semiconductor (CMOS) technology faces a major challenge in nanoscaled circuits, where power dissipation increases by a large amount. Quantum dot cellular automata (QCA) is a prominent nanotechnology for the evolution of nanostructure-based circuits. In QCA nanotechnology, a large amount of power dissipation is mitigated by the concept of reversible computing. Reversible gate provides one-to-one mapping, therefore dissipating very less power. Different reversible gates in QCA nanotechnology are having different structures and characteristics. This chapter compares various important reversible gates, and the results, which are investigated at logical and cell levels. The various reversible gate designs are different in terms of the number of QCA cells, occupied area, and time delays. Various comparisons are performed for the cell count, occupied area, and the applied number of clock zones. Different reversible gates are presented, and compared for use in complex designs. Reversible gates having less number of garbage outputs are preferred. The reversible gates are simulated using QCA designer.