Andreas Becher, Jorge Echavarria, Daniel Ziener, S. Wildermann, J. Teich
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In this paper, we propose a novel approximate adder structure for LUT-based FPGA technology. Compared with a full featured accurate carry-ripple adder, the longest path is significantly shortened which enables the clocking with an increased clock frequency. By using the proposed adder structure, the throughput of an FPGA-based implementation can be significantly increased. On the other hand, the resulting average error can be reduced compared to similar approaches for ASIC implementations.
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