A compact design of n-bit ripple carry adder circuit using QCA architecture

In this paper, we propose a new 3-dot based QCA architecture. We also present wiring logics, basic gates and XOR gate using proposed QCA 3-dot cell. All these components are very much efficient to compute basic operations. Moreover, we design a QCA 3-dot based half adder and extend the half adder into a full adder which has least number of QCA cells till now. We also design a powerful and efficient n-bit ripple carry adder applying our new and novel scheme. Our proposed circuits perform much better than the existing ones, e.g., the proposed 32-bit ripple carry adder circuit improves 21% on QCA cell, 99% on area than the existing best known one.