Low Complexity Logarithmic and Anti-Logarithmic Converters for Hybrid Number System Processors and DSP Applications

Van-Phuc HOANG
Cong-Kha PHAM

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E96-A    No.2    pp.584-590
Publication Date: 2013/02/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E96.A.584
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Digital Signal Processing
logarithmic converter,  anti-logarithmic converter,  look-up table (LUT)-based computation,  digital signal processing (DSP),  

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This paper presents an efficient approach for logarithmic and anti-logarithmic converters which can be used in the arithmetic unit of hybrid number system processors and logarithm/exponent function generators in DSP applications. By employing the novel quasi-symmetrical difference method with only the simple shift-add logic and the look-up table, the proposed approach can reduce the hardware area and improve the conversion speed significantly while achieve similar accuracy compared with the previous methods. The implementation results in both FPGA and 0.18-µm CMOS technology are also presented and discussed.