Swing Restored Low Power and Area Efficient 8-bit Arithmetic Logic Unit Using Modified Gate Diffusion Input Technique

Abstract

Abstract

The arithmetic logic unit (ALU) is one of the most fundamental operational units in any processor. The ALU is the heart of any system or any processor and the core component of the central processing unit because mainly all the fundamental operations are performed by the help of ALU only. So, it can be defined as the combinational unit that is used to perform its logical and arithmetic units. The purpose of this study is to design an 8-bit ALU by using swing restored modified gate diffusion input (GDI) technique to alleviate the problem of swing degradation, which is commonly encountered in GDI logic, and compared the results with previous techniques, i.e., CMOS, GDI, and modified GDI techniques. The new modified technology reduces the power and area and achieves full swing at output. The tasks perform by 8-bit ALU are logic operations (OR, AND, and EXOR) and arithmetic operations (ADDER, SUBTRACTOR, and MAGNITUDE COMPARATOR). All the logical operations are performed by the help of logic gates using swing restored modified GDI technology and also, implement all arithmetic operations by using these logic gates. This result is then given to the multiplexer and the result obtained is dependent on the input select line. The obtained result is calculated in the terms of average power, number of transistors, and delay. The implementation takes place in software CADENCE VIRTUOSO.

Keywords: ALU (arithmetic logic unit), CADENCE VIRTUOSO (tool), CMOS (complementary metal-oxide semiconductor), GDI technique (gate diffusion input), modified GDI technique, swing restored modified GDI technique

Cite this Article

Aparna Jose, Jyothisree K.R. Swing restored low power and area efficient 8-bit arithmetic logic unit using modified gate diffusion input technique. Journal of Microcontroller Engineering and Applications. 2018; 5(2): 19–29p.