Advertisement

Efficient Sigmoid Function for Neural Networks Based FPGA Design

  • Xi Chen
  • Gaofeng Wang
  • Wei Zhou
  • Sheng Chang
  • Shilei Sun
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4113)

Abstract

Efficient design of sigmoid function for neural networks based FPGA is presented. Employing the hybrid CORDIC algorithm, the sigmoid function is described with VHDL in register transfer level. In order to enhance the efficiency and accuracy of implementation on Altera’s FPGA, the technology of pipeline and look-up table have been utilized. Through comparing the results obtained by the post-simulation of EDA tools with the results directly accounted by Matlab, it can be concluded that the designed model works accurately and efficiently.

Keywords

Sigmoid Function Register Transfer Level CORDIC Algorithm CORDIC Iteration Spring Joint Computer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Hornik, K., Stinchcombe, M., White, H.: Multilayer Feedforward Networks. Neural Networks 2, 359–366 (1989)CrossRefGoogle Scholar
  2. 2.
    Martin, T.H., Howard, B., Demuth, M.B.: Neural Networks Design. China Machine Press (2002)Google Scholar
  3. 3.
    Ouali, J., Saucier, G.: Fast Generation of Neuron-ASICs. In: Proc. Int. Neural Networks Conf., pp. 563–567 (1990)Google Scholar
  4. 4.
    Murtagh, P., Tsoi, A.C.: Implementation Issues of Sigmoid Function and Its Derivative for VLSI Digital Neural Networks. In: IEE Proceedings on Computers and Digital Techniques, pp. 207–213 (1992)Google Scholar
  5. 5.
    Walther, J.: A Unified Algorithm for Elementary Functions. In: Spring Joint Computer Conf. Proc., pp. 379–385 (1971)Google Scholar
  6. 6.
    Wang, S., Piuri, V., Wartzlander Jr., E.E.: Hybrid Cordic Algorithms. IEEE Transactions on Computers 11, 1202–1206 (1997)CrossRefGoogle Scholar
  7. 7.
    Xia, F.: Efficient Arithmetic Functional Modules for FPGA-based VLSI Design. Master Dissertation, Nan Yang Technological University, Singapore (2005)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Xi Chen
    • 1
    • 2
  • Gaofeng Wang
    • 1
    • 2
  • Wei Zhou
    • 1
    • 2
  • Sheng Chang
    • 2
  • Shilei Sun
    • 2
  1. 1.School of Electronic InformationWuhan UniversityWuhanChina
  2. 2.Institute of C.J. Huang Information TechnologyWuhan UniversityWuhanChina

Personalised recommendations