Design of Novel Efficient Multiplexer Architecture for Quantum-dot Cellular Automata

Abstract

One of the promising emerging technology at nanoscale level to replace the conventional CMOS technology is Quantum-dot Cellular Automata (QCA). It has several advantages compared to conventional CMOS technology. Whereas multiplexers play a vital role in digital circuit implementations, this paper presents and evaluates a modular design methodology to build the high-performance 2 n :1 multiplexer. An efficient 2:1 QCA multiplexer architecture is proposed as the basic logic unit, which is utilized to present new and efficient 4:1, and 8:1 QCA multiplexer architectures. The proposed architectures have been implemented on the QCADesigner version 2.0.1. Our implementation results show that the proposed QCA multiplexer architectures have the best performance compared to other multiplexer architectures and outperform most of them in terms of area and clock zones.

A new design of QCA‐based nanoscale multiplexer and its usage in communications

“…(4)According to Equation (4), M is the number of majority gates, I is the number of inverters, C is the number of crossovers, T is the latency of the circuit, and k , l , and p are the exponential weightings for majority gate count, crossover count, and delay, respectively. Due to the achieved results, the proposed multiplexer layouts are optimized in terms of quantum cost compared with the existing designs except for 4 to 1 multiplexer in Sen et al and Rashidi and Rezai . It is worth mentioning that the presented multiplexers have been implemented without any crossover.…”

Novel single layer fault tolerance RCA construction for QCA technology

“…The majority gates can work as 2-input OR gates or 2-input AND gates by applying 1 or -1 to one of the inputs, respectively [8].…”

“…The QCA technology was addressed for the first time by Lent et al [7]. This technology presents a novel computation and information transformation method [8,9,10]. The four-dot square cell is the fundamental unit in the QCA technology, which contains two free electrons [9,11,12].…”

“…Interconnection among the electrons of intercell can make logic '1' and logic '0'. So, the logical states can be computed with the charge configuration of the QCA cell [8,13]. The basic components in this technology are QCA Majority Gate (MG), QCA Inverter Gate (IG) and QCA wire [9,14].…”

“…The basic components in this technology are QCA Majority Gate (MG), QCA Inverter Gate (IG) and QCA wire [9,14]. This technology has received extensive attention due to the immense practical applications such as QCA multiplexer [8,9,11], QCA multiplier [15], efficient design of QCA Full Adder (FA) [10,, comparator [14,36] and shift register [37].…”