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 the roadblocks in the nanotech scaling of transistors, which is an obvious reason for Moore's Law to be working at a slower pace. The CMOS, VLSI technology imposes serious challenges when it enters the nano-domain, leading to the need of an innovation in nanotech scale. Quantum Dot Cellular Automata (QDCA or QCA) is a novel emerging transistor-less revolution for computation in the nanotech order. Besides this, irreversibility is a major concern in digital computation due to the loss of information. Therefore, here a reversible methodology is followed to address the problem of power dissipation. The purpose of this paper is to present a novel reversible full adder (RFA) of complexity 123 cells, 1.5 delay and area of 0.11um2 is introduced using single layer cross over coplanar scheme, employing the demonstrated adder universal basic gates are implemented. On the basis of this adder we construct a 3-bit Comparator with a delay of 4.25 factors and cell count of 581.

Keywords

• QCA
• Reversible
• gates
• Reversible Full Adder(RFA)
• Power dissipation