BCD computing structures in quantum- dot cellular automata

This paper proposes a detailed design analysis of BCD computing circuit for quantum-dot cellular automata (QCA). QCA is attracting a lot of attentions due to its very small sizes and low power consumption. The primary device, a quantum-dot cell, can be used to make gates, wires, and memories as such it is the basic building block of nanotechnology circuits. Because of its innovation, the current literature shows design several circuit structures. This paper proposes a modular design of a BCD adder in QCA and shows analyses based upon those designs. The designs are analyzed according to complexity, and area. Using QCADesigner, the layout is simulated.