Abstract: In this paper, we first theoretically re-defined output decimal carry in terms of majority gates and proposed a carry look ahead structure for calculating all the intermediate output carries. We have used this method for designing the multi-digit decimal adders. Theoretically, our best n-digit decimal adder design reduces the delay and Area-Delay Product (ADP) by 50% compared with previous designs. We have implemented our designs using QCA Designer tool. The proposed QCA Designer based 8-digit PBA-BCD adder achieves over 38% less delay compared with the best existing designs.

Keywords: Majority gate, parallel BCD adder, carry look ahead, quantum-dot cellular automata.

| DOI: 10.17148/IJIREEICE.2019.8319