LAUSR

In this paper, fast logarithmic converters with high accuracy are proposed. In previous works, using logarithmic number system (LNS)—based units can help to reduce the computation efforts in delay and area for digital signal processing applications. Among these LNS-based units, shift-and-and based scheme is the most suitable for low-error approximation with reduced area and delay costs. Based on the shift-and-add schemes, by adopting our proposed coefficients capturing schemes, the converters could achieve fast logarithmic conversion with high accuracy and reduced area costs. Therefore, our proposed converters could be applied to boost up the overall performance in logarithmic number systems. Our proposed logarithmic converters are synthesized using TSMC 0.18 μm process technology. Simulation results show that our proposed logarithmic converters could outperform previously proposed shift-and-add methods in the literature. Our proposed fast logarithmic converters with high accuracy can be applied to digital signal processing and digital camera application.