Design and Analysis of Approximate Adders Using Multiplexer

An adder is the basic computational circuit in digital Very Large Scale Integration design., Approximate Adders have been proposed to improve the design metrics of an adder. A multiplexer makes it possible for several input signals to share one device or resource. In this paper multiplexer based approximate full adder is proposed for low power approximate adders. The MAA architecture is build using the inverter-based multiplexer which gives high power efficiency than the other adders, for performance evaluation four types of approximate mirror adders have been referred. On analysis it is found that Multiplexer based approximate full adder is the most power efficient with a considerable propagation delay.