Design of 8-bit ALU Using OAI Logic at Subthreshold Voltage

This paper explains about an 8-bit ALU using OAI logic. This architecture of the S-bit ALU uses 90nm CMOS technology. OR-AND-INVERT (OAI) logic is used in the design to reduce power consumption. There are four main components of ALU. They are AE, LE, CE and FA. All these blocks are designed in both CMOS and OAI logic. The results are verified with SS, SF, FS, FF process corners at supply voltages of 1.2V, 0.8V and 0.4V. The power consumption observed is very less at SS process corner. Using this OAI logic the ALU can be operated at subthreshold voltage. The proposed work offers saving up to 68.54% in power consumption.