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Implementation of elementary functions for logarithmic number systems

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3 Author(s)
Johansson, K. ; Dept. of Electr. Eng., Linkoping Univ., Linkoping ; Gustafsson, O. ; Wanhammar, L.

Computations in logarithmic number systems require realisations of four different elementary functions. In the current paper the authors use a recently proposed approximation method based on weighted sums of bit-products to realise these functions. It is shown that the considered method can be used to efficiently realise the different functions. Furthermore, a transformation is proposed to improve the results for functions with logarithmic characteristics. Implementation results shows that significant savings in area and power can be obtained using optimisation techniques.

Published in:

Computers & Digital Techniques, IET  (Volume:2 ,  Issue: 4 )