Fast parallel-prefix Ling-carry adders in QCA nanotechnology

A. Thanos, H. T. Vergos
2013 2013 IEEE 20th International Conference on Electronics, Circuits, and Systems (ICECS)  
Ling-carry adders that use a L parallel-prefix algorithm for carry com explored for quantum-dot cellular aut nanotechnology implementations. The r from drawn layouts, indicate that the pr outperform in terms of delay all previ architectures explored for QCA implem delay difference is becoming bigger in proposed adders as we move to larger wor INTRODUCTION CMOS technology's role as the d implementation technology is expected t problems in the near future due to limitation channel effects, doping
more » ... nel effects, doping fluctuations an difficult and expensive lithography at nan innovative technologies need therefore to be possible alternatives. To this end, several na have been considered, including carbon na nanowires, resonant tunneling diodes etc Cellular Automata (QCA) has been introd them [1] and is considered a revolutiona promising nanotechnology due to outst efficiency, high density, fast computing p room temperature operation. Although QCA devices implementation development, circuit architectures in QC researched, taking into account that the algor for implementing circuits in CMOS may no optimal for other technologies due to characteristics of each technology. In this manuscript we focus on adder i in QCA since addition is the most fundamen every digital system. Several adder desi proposed for QCA nanotechnology [2-4], look ahead, ripple carry [2] and carry fl Ladner-Fischer parallel-prefix adders and a built by mixing Ladner-Fischer and ripple-ca also been considered in [4] . In this paper, we suitability for QCA of an adder, which uses definition and a parallel-prefix computation u QCA drawn layouts and simulation results f adder. Our results indicate that this p architecture offers the least execution de known proposals. The rest of the paper is organized as fol provides some background on QCA nanotech overview of the parallel-prefix addition for with Ling carry definition and a theoretical d the parallel-prefix Ling adder in QCA are g 3. Section 4 presents implementations of the with example layouts drawn and simulation as comparisons with previously proposed arc
doi:10.1109/icecs.2013.6815477 dblp:conf/icecsys/ThanosV13 fatcat:pwlsliflovczzfkye2d44zyjya