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A fully flexible circuit implementation of clique-based neural networks in 65-nm CMOS

Benoît Larras 1 Paul Chollet 2 Cyril Lahuec 2 Fabrice Seguin 2 Matthieu Arzel 2
1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520
2 ELEC - Département Electronique
Abstract : Clique-based neural networks implement low-complexity functions working with a reduced connectivity between neurons. Thus, they address very specific applications operating with a very low-energy budget. However, the implementation in the state of the art is not flexible and a fabricated circuit is only usable in a unique use case. Besides, the silicon area of hardwired circuits grows exponentially with the number of implemented neurons that is prohibitive for embedded applications. This paper proposes a flexible and iterative neural architecture capable of implementing multiple types of clique-based neural networks of up to 3968 neurons. The circuit has been integrated in an ST 65-nm CMOS ASIC and occupies a 0.21-mm 2 silicon surface area. The proper functioning of the circuit is illustrated using two application cases: a keyword recovery application and an electrocardiogram classification. The neurons outputs are updated 83 ns after a stimulation, and a neuron needs an energy of 115 fJ to propagate a change at the input to its output.
Keywords : Neurons Synapses Biological neural networks Silicon Leakage currents Complexity theory Neural networks circuit clique-based neural networks analog/mixed-signal circuit iterative circuit structure classification circuit
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https://hal-imt-atlantique.archives-ouvertes.fr/hal-01983523
Contributor : Cyril Lahuec <>
Submitted on : Wednesday, January 16, 2019 - 3:07:40 PM
Last modification on : Wednesday, April 7, 2021 - 10:32:10 AM

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IMT-ATLANTIQUE | CNRS | INSTITUT-TELECOM | UNIV-LILLE | UNIV-VALENCIENNES | IEMN

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Benoît Larras, Paul Chollet, Cyril Lahuec, Fabrice Seguin, Matthieu Arzel. A fully flexible circuit implementation of clique-based neural networks in 65-nm CMOS. IEEE Transactions on Circuits and Systems I: Regular Papers, IEEE, 2018, 66 (5), pp.1-12. ⟨10.1109/TCSI.2018.2881508⟩. ⟨hal-01983523⟩

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