Analogue CMOS circuit implementation of a dopamine modulated synapse

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    Abstract

    This paper describes a synapse circuit that approximately implements the dynamics of the dopamine (DA) modulated synapse proposed by Izhikevich (2007). The dynamics of the model, based on 'eligibility traces' generated according to a spike-timing-dependent plasticity (STDP) rule, ensure that causal pre-/postsynaptic spiking activity in the time preceding the reward, signaled by DA, leads to strengthening of the synaptic connections. The circuits are designed and fabricated in a 0.35 μm CMOS technology and the simulation results are presented. This circuit block is a good candidate for the development of neuromorphic VLSI architectures that implement brain-inspired computation using biologically plausible reinforcement learning strategies.
    Original languageEnglish
    Title of host publicationProceedings - IEEE International Symposium on Circuits and Systems|Proc IEEE Int Symp Circuits Syst
    PublisherIEEE
    Pages877-880
    Number of pages4
    ISBN (Print)9781424494736
    DOIs
    Publication statusPublished - 2011
    Event2011 IEEE International Symposium of Circuits and Systems, ISCAS 2011 - Rio de Janeiro
    Duration: 1 Jul 2011 → …
    http://dx.doi.org/10.1109/ISCAS.2011.5937774

    Conference

    Conference2011 IEEE International Symposium of Circuits and Systems, ISCAS 2011
    CityRio de Janeiro
    Period1/07/11 → …
    Internet address

    Keywords

    • CMOS analogue integrated circuits
    • VLSI
    • circuit simulation
    • network synthesis
    • neural chips

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