Design of high performance and low power multiplier using modified booth encoder

Abstract

Low-power multipliers are very important for reducing energy consumption of digital processing systems. This study provides the experience of applying an advanced version of our former Spurious Power Suppression Technique (SPST) on multipliers for high-speed and low-power purposes. To filter out the useless switching power, there are two approaches, i.e. using registers and using AND gates, to assert the data signals of multipliers after the data transition. Multiplication occurs frequently in finite impulse response filters, fast Fourier transforms, discrete cosine transforms, convolution, and other important DSP and multimedia kernels. The objective of a good multiplier is to provide a physically compact, good speed and low power consuming chip. To save significant power consumption of a VLSI design, it is a good direction to reduce its dynamic power that is the major part of total power dissipation. In this paper, we propose a high speed low-power multiplier adopting the new SPST implementing approach. This multiplier is designed by equipping the Spurious Power Suppression Technique (SPST) on a modified Booth encoder which is controlled by a detection unit using an AND gate. The modified booth encoder will reduce the number of partial products generated by a factor of 2. The SPST adder will avoid the unwanted addition and thus minimize the switching power dissipation. The proposed high speed low power multiplier can attain 30% speed improvement and 22% power reduction in the modified booth encoder when compared with the conventional array multipliers.