Design of Robust and High-Performance 1-Bit CMOS Full Adder for Nanometer Design

Abstract

Full-adders are the core element of the complex arithmetic circuits like addition, multiplication, division and exponentiation. Regarding to this importance, new idea and investigations for constructing full-adders are required. As far as related literature is concerned, generality and ease of use, as well as voltage and transistor scaling are considerable advantages of CMOS logic design versus other design style such as CPL specially when cell-based design are targeted. This paper proposes a novel, symmetric and efficient design for a CMOS 1-bit full-adder. Besides, another fully symmetric full-adder has been presented. Results and simulations demonstrate that the proposed design leads to an efficient full-adder in terms of power consumption, delay and area in comparison to a well-known conventional full-adder design. The postlayout simulations have been done by HSPICE with nanometer scale transistors considering all parasitic capacitors and resistors.

A New High-Performance Bridge Structure for 4- to-2 Compressor using CMOS and CNFET Technology

“…In fact, structure of the bridge by shortening the route and reducing the transistors, reduces the complex and increases the efficiency of proposed 4-to-2 compressor cell [29][30][31]. Fig.4 shows a full adder cell designed using bridge structure.…”

“…Fig.4 shows a full adder cell designed using bridge structure. This bridge design of full Bridge design style centralizes its attention on meshes and connects each two adjacent meshes by a transistor, called bridge transistor; whereas each branch provides a path from supply lines to an output [30]. The functionality of the presented Full Adder cell is based on (15) and (16).…”

A Novel Ternary-to-Binary Converter in Quantum-Dot Cellular Automata

“…Many types of small gates to large and complex microprocessors have been manufactured based on this technology. There are still numerous investigations being done in this field which have focused on basic elements such as adders [1][2][3]. In spite of all advantages of this ubiquitous technology, it is facing issues and weakening points while deals with very small scales.…”

High-performance bridge-style full adder structure

“…Many studies have been done to reduce area, delay, power, and energy of adder cells. [1][2][3][4][5] Many of these studies have been investigated different topologies to implement the cells with focus on delay-power trade-off without considering process variation. 1,2 As technology is scaling down challenges faced by the designers become more complex.…”