Efficient Design of Low-Power 4-bit ALU using HVT Cell Concept

Abstract

In this paper a 4-bit two input ALU is designedusing hvt cells in 45nm technology. ALU is most importantelement in CPU. It consists of AE, LE, FA, and CE. FA isdesigned using Transmission gate based multiplexer concept.This ALU is designed to manipulate both arithmetic andlogical operations and internally arithmetic block is designedto calculate both signed and unsigned numbers. The LE andFA are implemented using hvt cells. The ALU is designed andimplemented using CADENCE Tools with GPDK 45nmTechnology. The power is compared between normalthreshold voltage level transistors and high threshold voltagelevel transistors. The simulation results show that design ofLE and FA through high threshold voltage level cells is more power efficient than with low threshold voltage level cells