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Abstract

Addition plays a vital role in all arithmetic operations. It is used widely in many VLSI systems such as application specific DSP architecture and microprocessor architecture. The energy efficient designs have gained more recent attention and for highly employed functional units, especially for the adders. The energy consumption of an adder depends on the circuit minimizing, the addition procedure, the recurrence structure and the wiring complexity. Weinberger and Ling are the two most commonly used binary addition algorithms that are used in adders. This paper gives the performance evaluation of addition algorithms on Kogge-Stone arrangement and have been observed to save energy by the proper selection of addition algorithms in 16-bit adders. The design of Kogge-Stone adder has been carried out by using TANNER EDA tool. The efficiency of the adder design can be improved by prefix selection, the algorithm, computational sum and logic depth. When compared to Weinberger algorithm, the number of gates used is less in case of the proposed ling recurrence algorithm.