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Error modelling of dual fixed-point arithmetic and its application in field programmable logic

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3 Author(s)
C. T. Ewe ; Dept. of Electr. & Electron. Eng., Imperial Coll. London, UK ; P. V. K. Cheung ; G. A. Constantinides

Dual FiXed-point (DFX) is a new data representation which is an efficient compromise between fixed-point and floating-point representations. DFX has an implementation complexity similar to that of a fixed-point system with the improved dynamic range capability of a floating-point system. Automating the process of DFX scaling optimisation requires the knowledge of its truncation/rounding noise properties. This paper presents truncation and rounding error models for DFX arithmetic as traditional error models do not apply to DFX. The models were tested on a 159-tap FIR filter and the benefits of using DFX over floating-point are demonstrated with implementations on a Xilinx Virtex II Pro.

Published in:

International Conference on Field Programmable Logic and Applications, 2005.

Date of Conference:

24-26 Aug. 2005