Design of Parallel Prefix Adders using FPGAs

Provided by: Iosrjournals
Topic: Hardware
Format: PDF
Parallel prefix adders are one of the fastest types of adder that had been created and developed. This paper investigates three types of carry-tree adders (the Kogge-Stone, sparse Kogge-Stone, and spanning tree adder) and compares them to the simple ripple carry adder and carry skip adder. These designs of varied bit widths were implemented on a Xilinx Spartan 3E FPGA and delay measurements were made with a high performance logic analyzer. Due to the presence of a fast carry-chain, the RCA design exhibit better delay performance up to 128 bits.

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