Transient variability in SOI-based LIF Neuron and impact on unsupervised learning

Show simple item record Dutta, Sangya Bhattacharya, Tinish Mohapatra, Nihar Ranjan Suri,Manan Ganguly, Udayan 2018-10-20T08:05:51Z 2018-10-20T08:05:51Z 2018-10
dc.identifier.citation Dutta, Sangya; Bhattacharya, Tinish; Mohapatra, Nihar R.; Suri,Manan and Ganguly, Udayan, "Transient variability in SOI-based LIF Neuron and impact on unsupervised learning", IEEE Transactions on Electron Devices, DOI: 10.1109/TED.2018.2872407, Oct. 2018. en_US
dc.identifier.issn 0018-9383
dc.identifier.issn 1557-9646
dc.description.abstract Variability is an integral part of biology. A biological neural network performs efficiently despite variability and sometimes its performance is facilitated by the variability. Hence, the study of variability on its electronic analog is essential for constructing biomimetic neural networks. We have recently demonstrated a compact leaky integrate and fire (LIF) neuron on PD-silicon on insulator (SOI) MOSFET. In this paper, we have studied impact ionization (II)-induced variability both device-to-device (D2D) and cycle-to-cycle (C2C) in the SOI neuron. The C2C variability is attributed to the fluctuation in the II-generated charge storage and it is enhanced by at least 2.5x as compared to the no-II case. The D2D variability, on the other hand, is related to the II-induced sharp subthreshold slope (~ 40 mV/decade), which enhanced the variability by ~20x compared to the no-II case. The impact of the enhanced variability in SOI neurons on an unsupervised classification task was evaluated by simulating a spiking neural network (SNN) with both analog and binary synapses. For analog synapse-based SNN, the C2C variability improved the performance by ~ 5% relative to ideal LIF neurons. However, the D2D variability, as well as combined D2D and C2C variability, degrades learning by -~ 10%. For binary synapses, we observe that performance drastically degrades for ideal LIF neurons as the synaptic weight initialization becomes nonrandom. However, neurons with the experimentally demonstrated variability (C2C and D2D) mitigate this challenge. Therefore, this enables binary synapses to perform at par with analog synapses, which allows for deterministic weight initialization. This makes RNG circuits for random weight initialization redundant.
dc.description.statementofresponsibility by Sangya Dutta, Tinish Bhattacharya, Nihar R. Mohapatra, Manan Suri and Udayan Ganguly
dc.format.extent pp no. 1-8
dc.language.iso en en_US
dc.publisher IEEE en_US
dc.subject Neurons en_US
dc.subject Synapses en_US
dc.subject Silicon-on-insulator en_US
dc.subject Transient analysis en_US
dc.subject Device-to-device communication en_US
dc.subject Performance evaluation en_US
dc.title Transient variability in SOI-based LIF Neuron and impact on unsupervised learning en_US
dc.type Article en_US
dc.relation.journal IEEE Transactions on Electron Devices

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