Fred N. Buhler, Adam E. Mendrela, Yong Lim, Jeffrey Fredenburg, M. Flynn
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A 16-channel noise-shaping machine learning analog-digital interface
A 16-channel machine learning digitizing interface embeds Inner-Product calculation within a Delta-Sigma Modulator (IPDSM) array canceling quantization noise and noise shaping the multiplicand. The prototype, with 16 independent IPDSM channels occupies a core area of 0.95mm2 in 65 nm CMOS. Each channel performs up to 100M multiplications/s. The system is demonstrated with a standard machine learning scheme for image recognition. It achieves the same classification accuracy for the MNIST set of hand-written digits as with the same algorithm on floating point DSP.
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