Design of low power ALU using 8T FA and PTL based MUX circuits

In this paper we proposed an ALU using Novel 8T full adder and Pass transistor logic based multiplexers. A 4×1 and a 2×1 multiplexer were used to design an ALU. Full adder is an essential component for designing all types of processors like digital signal processors (DSP), microprocessors etc. In existing method full adder and multiplexers were designed using transmission gate logic. To reduce the number of transistors multiplexers were designed using pass transistor logic and the full adder is designed using 8 transistors. Full adder is designed using 8 transistor logic and multiplexers were designed using pass transistor logic and this is used in the implementation of ALU. In the implementation of ALU, the power and the area were greatly reduced to more than 70% compared to the existing method.