Design of a Reversible Full Adder Using Quantum Cellular Automata

Abstract

Abstract: Contemporary times holds a substantial hurdle in the designing of chips and ICs due to theroadblocks in the nanotech scaling of transistors, which is an obvious reason for Moore's Law to be working at aslower pace. The CMOS, VLSI technology imposes serious challenges when it enters the nano-domain, leadingto the need of an innovation in nanotech scale. Quantum Dot Cellular Automata (QDCA or QCA) is a novelemerging transistor-less revolution for computation in the nanotech order. Besides this, irreversibility is a majorconcern in digital computation due to the loss of information. Therefore, here a reversible methodology isfollowed to address the problem of power dissipation. The purpose of this paper is to present a novel reversiblefull adder (RFA) of complexity 123 cells, 1.5 delay and area of 0.11um2 is introduced using single layer crossover coplanar scheme, employing the demonstrated adder universal basic gates are implemented. On the basis ofthis adder we construct a 3-bit Comparator with a delay of 4.25 factors and cell count of 581.