Design of 1-bit Comparator using 2 Dot 1 Electron Quantum-Dot Cellular Automata

Abstract

Abstract-Innanotechnologies, quantum-dot cellular automata (QCA) offer promising and attractive features for nano-scale computing. QCA effectively overcomes the scaling shortfalls of CMOS technology. One of the variants of QCA is 4 Dot 2 Electron QCA which is well explored and researched. The main concentration of this study is on 2 Dot 1 Electron QCA, an emerging variant of QCA. A novel and efficient XOR gate based on 2 Dot 1 Electron QCA is designed. Moreover a comparator using the proposed novel XOR gate is presented in this present scope. The proposed architecture is justified using a wellaccepted standard mathematical function based on Coulomb's law. Energy and power dissipation of the architecture are analyzed using different energy parameters. AS the compactness of proposed design is 76.4% the design met high degree of compactness and better efficiency.

Design of efficient coplanar 1-bit comparator circuit in QCA technology

“…Comparator circuits play an important role in digital circuits [9][10][11][12][15][16][17][18]. This circuit compares their two inputs.…”

“…This circuit compares their two inputs. Suppose A and B are two inputs of the comparator circuit, the outputs of this circuit are defined as follows [15]:…”

“…There are three basic gates in this technology: inverter gate, majority (M) gate, and XOR gate [3][4]. These gates are building blocks for constructing the logic circuits such as QCA multiplexers [5,7], QCA full address [1-3, 6, 8] and QCA comparators [9][10][11][12][15][16][17][18].…”

“…On the other hand, the comparator circuits play an important role in digital circuits such as micro controllers [6,12,[15][16][17][18]. Thus, the implementation of high-performance comparator circuits has a great deal of attention, and a lot of effort [10][11][12][15][16][17][18] has been invested in performance improvement in the QCA comparator circuits. Das and De [10] have presented a 1-bit QCA comparator that requires 0.343 µm 2 area and 319 QCA cells.…”

Design and Implementation of New Feynman and Toffoli (NFT) Gates in Quantum-dot Cellular Automata (QCA)

“…It is now believed that within the next two decades, the semiconductor industry will have to start using new Nano electronic devices [7][8][9][10]. The inter-national roadmap for semiconductors has enumerated several Nano electronics alternatives including Resonant Tunneling Diodes (RTD), Quantum-dot Cellular Automata (QCA), Tunneling Phase Logic (TPL), and Single Electron Tunneling (SET) [11]. Amongst all these technologies, QCA promises to provide the highest de-vice density with the low power consumption and high switching speeds [12][13].…”