Signal and noise extraction from analog memory elements for neuromorphic computing

Nature Communications
N GongT Ando

Abstract

Dense crossbar arrays of non-volatile memory (NVM) can potentially enable massively parallel and highly energy-efficient neuromorphic computing systems. The key requirements for the NVM elements are continuous (analog-like) conductance tuning capability and switching symmetry with acceptable noise levels. However, most NVM devices show non-linear and asymmetric switching behaviors. Such non-linear behaviors render separation of signal and noise extremely difficult with conventional characterization techniques. In this study, we establish a practical methodology based on Gaussian process regression to address this issue. The methodology is agnostic to switching mechanisms and applicable to various NVM devices. We show tradeoff between switching symmetry and signal-to-noise ratio for HfO2-based resistive random access memory. Then, we characterize 1000 phase-change memory devices based on Ge2Sb2Te5 and separate total variability into device-to-device variability and inherent randomness from individual devices. These results highlight the usefulness of our methodology to realize ideal NVM devices for neuromorphic computing.

References

Mar 3, 2010·Nano Letters·Sung Hyun JoWei Lu
May 4, 2010·Neural Networks : the Official Journal of the International Neural Network Society·S RenaudS Saïghi
May 29, 2015·Nature·Yann LeCunGeoffrey Hinton
May 18, 2016·Nature Nanotechnology·Tomas TumaEvangelos Eleftheriou
May 13, 2017·Nature Communications·Peng YaoHe Qian
May 23, 2017·Nature Nanotechnology·Patrick M SheridanWei D Lu

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Citations

Apr 27, 2019·Nanotechnology·Sahar AlialyJohn J Boland
Aug 5, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Hong HanWentao Xu
Jun 10, 2020·Scientific Reports·Vasileios Athanasiou, Zoran Konkoli
Jul 18, 2020·Nanotechnology·Karl BerggrenArijit Raychowdhury
Jan 10, 2020·Nano Letters·Tímea Nóra TörökAndrás Halbritter
Mar 17, 2020·ACS Applied Materials & Interfaces·Chaoxing WuTae Whan Kim
Dec 4, 2019·ACS Nano·Jakub JadwiszczakHongzhou Zhang
May 12, 2020·ACS Applied Materials & Interfaces·Bin TangQing Chen
Mar 21, 2020·ACS Applied Materials & Interfaces·Mattia HalterJean Fompeyrine
Jun 15, 2020··Udit GuptaX. Sharon Hu

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Methods Mentioned

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