Adder Design Using Reversible Logic

Reversible logic is a prominent area of research due to its interesting characteristics. Reversible logic is also useful in low power computing. The quantum computing technique is also reversible, and so another attraction is attached with this logic. In computing, adders are very important circuit. Adders play a major role in the design of various computing devices. And so, adders are extensively studied. There are adders proposed in many literatures, even though there is always an ample scope to improve the designs. In this manuscript, two reversible gates also called microblocks are presented. Then using these gates, two new adders are designed. One of the designs is a ripple carry adder, and the other design is an improved design in terms of quantum cost and delay. These proposed circuits are constructed using reversible logic. The presented adders are compared with some available literatures on full adders, and it is found that the performance of the proposed adders is of comparable standard. Two designs of 2-bit adders are also presented, and using these deigns, n-bit realization of adders can be achieved.