The terahertz optical asymmetric demultiplexer (TOAD) or semiconductor amplifier (SOA)-assisted Sagnac switches have been used to construct an all-optical 4-bit carry skip adder. This design aims satisfy the high speed and accuracy requirements of modern ultrafast digital transmission. Using a combination multiplexer full adder, we describe When compared ripple adder look-ahead may be employed ...

moving towards nanometer scales, quantum-dot cellular automata (qca) technology emerged as a novel solution, which can be a suitable replacement for complementary metal-oxide-semiconductor (cmos) technology. the 3-input majority function and inverter gate are fundamental gates in the qca technology, which all logical functions are produced based on them. like cmos technology, making the basic c...

The Full Adder circuit is an important component in application such as Digital Signal Processing (DSP) architecture, microprocessor, and microcontroller and data processing units. This paper discusses the evolution of full adder circuits in terms of lesser power consumption, higher speed. Starting with the most conventional 28 transistor full adder and then gradually studied full adders consis...

Conservative and reversible logic gates are widely known to be compatible with revolutionary computing paradigms such as optical and quantum computing. A fundamental conservative reversible logic gate is the Fredkin gate. This paper presents efficient adder circuits based on the Fredkin gate. Novel full adder circuits using Fredkin gates are proposed which have lower hardware complexity than th...

In this paper, five new multiplexer-based architectures for 1 -bit full adder circuit designs are proposed. Following these architectures, various full adder circuits can be built through different circuit implementations of multiplexers. For instance, in this paper, we demonstrate that by substituting each multiplexer with two transmission gates, a set of new full adder circuits are ready to b...

Parallel-prefix adders (also known as carrytree adders) are known to have the best performance in VLSI designs compared to that of conventional Ripple Carry Adder (RCA). However, each type of parallel prefix adder has its own pros and cons and are chosen according to the design requirement of the application. This paper investigates mainly two types of carry-tree adders, the brent kungg adder a...

Quantum addition circuits are considered being of two types: (1) Toffoli-adder which use only classical reversible gates (controlled-not and Toffoli), (2) QFT-adder based on the quantum Fourier transformation. We present a systematic translation QFT circuit into Toffoli-based adder. This result shows that has fundamentally same fault-tolerance cost (e.g., T count) as most cost-efficient Toffoli...

   Quantum-dot Cellular Automata (QCA) technology is a solution for implementation of the nanometer sized circuits and it can be a suitable replacement for CMOS. Similar to CMOS technology, designing the basic computational element such as adder with the QCA technology is regarded as one of the most important issues that extensive researches have been done about it. In this paper, a new eff...

A novel synchronous dual-bit adder design, realized using the elements of commercial standard cell libraries is presented in this article. The adder embeds two-bit carry look-ahead generator functionality and is realized using simple and compound gates of the standard cell library. The performance of the proposed dualbit adder design is evaluated and compared vis-à-vis the conventional full add...

Reversible logic has extensive applications in quantum computing, it is a unconventional form of computing where the computational process is reversible, i.e., time-invertible. The main motivation behind the study of this technology is aimed at implementing reversible computing where they offer what is predicted to be the only potential way to improve the energy efficiency of computers beyond v...