Design of a 4 Bit Arithmetic & Logic Unit, Evaluation of Its Performance Metrics & its Implementation in a Processor

Device scaling has been trending due to its sleek and small dimensions yet its energy efficiency limits itself. With the increasing demand for speed, portability and miniaturization of current gadgets, the power consumption of these products has become a major design factor. Especially for mobile devices, the power consumption drives the battery life-time, the generated heat and the required heat dispersion measures. Therefore, this demands a reduction in the power dissipation of digital circuits. Processors have become increasingly complex and power hungry. There are many applications of microprocessors with limited resources, where energy efficiency becomes a critical requirement. Power dissipation depends on the CMOS fabrication technology, operating frequency, but most of all on the switching per clock cycle within the digital circuit. Power consumption due to device parasites is another major design issue. This paper implements an Arithmetic & Logic Unit (ALU) that is both Ultra-Low Power and High Speed. The design was implemented in 45nm technology. The proposed ALU was implemented in Digital Environment with Verilog HDL so as to optimize the design.