A new coplanar design of a 4?bit ripple carry adder based on quantum?dot cellular automata technology

Quantum-dot cellular automata (QCA) is one of the best methods to implement digital circuits at nanoscale. It has excellent potential with high density, fast switching speed, and low energy consumption. Researchers have emphasized reducing number gates, delay, cell count in QCA technology. In addition, a ripple carry adder (RCA) circuit which each full adder's carry-out connection for next carry-in. These types adders are quite simple easily expandable any desired size. However, they relatively slow because carries may broadcast across entire adder. Therefore, an RCA design on nanoscale proposed diminish number, improve complexity, decrease latency. The QCADesigner simulation tool used verify correctness suggested circuit. comparison results indicate approximately 49.14% improvement 14.29% advantage area state-of-the-art 4-bit designs obtained specify effectiveness offered design.