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    Recursive Threshold Logic - A Bioinspired Reconfigurable Dynamic Logic System with Crossbar Arrays

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    Type
    Article
    Authors
    James, Alex Pappachen
    Krestinskaya, Olga
    Maan, Akshay
    KAUST Department
    KAUST, 127355 Thuwal, Makkah Saudi Arabia
    Date
    2020
    Permanent link to this record
    http://hdl.handle.net/10754/665371
    
    Metadata
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    Abstract
    The neuron behavioral models inspire from the principle of the firing of neurons, and weighted accumulation of charge for a given set of input stimuli. Biological neurons show dynamic behavior through its feedback and feedforward time-dependent responses. The principle of the firing of neurons inspires threshold logic design by applying threshold functions on the weight summation of inputs. We present a recursive threshold logic unit that uses the output feedback from standard threshold logic gates to emulate Boolean expressions in a time-sequenced manner. The Boolean expression is implemented with an analog resistive divider in memristive crossbars and a hard-threshold function designed with CMOS comparator for realizing the sums (OR) and products (AND) operators. The method benefits from reliable programming of the memristors in 1T1R crossbar configuration to suppress sneak path currents and thus enable larger crossbar sizes, which in turn allow a higher number of Boolean inputs. The reference threshold voltage for the decision comparators is tuned to implement AND and OR logic. The threshold value range is limited by the number of inputs to the crossbar. At the same time, the resistance of the memristors is kept constant at $R_{ON}$. The circuit's tolerance to the memristor variability and aging are analyzed, showing sufficient resilience. Also, the proposed recursive logic uses fewer cross-points, and has lower power dissipation than other memristive logic and CMOS implementation.
    Citation
    James, A. P., Krestinskaya, O., & Maan, A. (2020). Recursive Threshold Logic - A Bioinspired Reconfigurable Dynamic Logic System with Crossbar Arrays. IEEE Transactions on Biomedical Circuits and Systems, 1–1. doi:10.1109/tbcas.2020.3027554
    Sponsors
    The project is funded through the Clootrack & Indriyam -NeuroAGI/IIITMK industry research grant. Also, thankful for the manuscript’s critical evaluations by anonymous reviewers and editors, which have helped improve the paper’s content and presentation.
    Publisher
    IEEE
    Journal
    IEEE Transactions on Biomedical Circuits and Systems
    DOI
    10.1109/TBCAS.2020.3027554
    Additional Links
    https://ieeexplore.ieee.org/document/9209063/
    https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9209063
    ae974a485f413a2113503eed53cd6c53
    10.1109/TBCAS.2020.3027554
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