LAUSR

Quantum-dot is the result of elastic relaxation which has a straight relationship with the optical and electronic aspects of the quantum-dot-based devices. In nanotechnologies, Quantum-dot Cellular Automata (QCA) is a perfect transistor-less computation method where it tries to create general computation at the nanoscale with better switching frequency and enhanced scale integration to overcome the scaling shortfalls of CMOS technology. In this technology, binary information is represented based on the distribution of electron configuration in chemical molecules. Also, the comparator is the essential component in digital circuits, which takes two binary numbers as input and implements their resemblance. In this paper, a 1-bit comparator architecture in an optimized and efficient manner is suggested to bring a new phase of comparator circuit based on QCA, and then a novel 2-bit comparator structure is offered. The simulation and functionality of proposed comparators have been examined by the QCAdesigner tool, and comparison with formerly designs shows a high degree of compactness and consistent performance of proposed designs. Proposed 1-bit and 2-bit QCA comparators exhibit a delay of 0.75 and 2.75 clock cycle, occupy an active area of 0.04 and 0.19 μm 2, and use 31 and 125 QCA cells, respectively.