Design of 32 bit Parallel Prefix Adders

Abstract

In this paper, we propose 32 bit Kogge-Stone, Brent-Kung, Ladner-Fischer parallel prefix adders. In general N-bit adders like Ripple Carry Adders (slow adders compare to other adders), and Carry Look Ahead adders (area consuming adders) are used in earlier days. But now the most Industries are using parallel prefix adders because of their advantages compare to other adders. Parallel prefix adders are faster and area efficient. Parallel prefix adder is a technique for increasing the speed in DSP processor while performing addition. We simulate and synthesis different types of 32-bit prefix adders using Xilinx ISE 10.1i tool. By using these synthesis results, we noted the performance parameters like number of LUTs and delay. We compare these three adders in terms of LUTs (represents area) and delay values.