In this paper a 4-bit two input ALU is designed using hvt cells in 45nm technology. ALU is most important element in CPU. It consists of AE, LE, FA, and CE. FA is designed using Transmission gate based multiplexer concept. This ALU is designed to manipulate both arithmetic and logical operations and internally arithmetic block is designed to calculate both signed and unsigned numbers. The LE and FA are implemented using hvt cells. The ALU is designed and implemented using CADENCE Tools with

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... 45nm Technology. The power is compared between normal threshold voltage level transistors and high threshold voltage level transistors. The simulation results show that design of LE and FA through high threshold voltage level cells is more power efficient than with low threshold voltage level cells.