Energy-Efficient Approximate Multiplication for Digital Signal Processing and Classification Applications

"The need to support various digital signal processing (DSP) and classification applications on energy-constrained devices has steadily grown. Such applications often extensively perform matrix multiplications using fixed-point arithmetic while exhibiting tolerance for some computational errors. Hence, improving the energy efficiency of multiplications is critical. In this brief, we propose multiplier architectures that can tradeoff computational accuracy with energy consumption at design time. Compared with a precise multiplier, the proposed multiplier can consume 58% less energy/op with average computational error of similar to 1%. Finally, we demonstrate that such a small computational error does not notably impact the quality of DSP and the accuracy of classification applications."This work was supported in part by the National Science Foundation under Grant CCF-0953603, in part by the Defense Advanced Research Projects Agency under Grant HR0011-12-2-0019, and in part by the MSIP of Korea (CPS Global Center). N. S. Kim has a financial interest in the Advanced Micro Devices, Seoul, Korea and Samsung Electronics Company, Ltd., Seoul. (Corresponding author: N. S. Kim and T. Park.