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Pulse Shape and Timing Dependence on the Spike-Timing Dependent Plasticity Response of Ion-Conducting Memristors as Synapses.

Abstract

Ion-conducting memristors comprised of the layered materials Ge2Se3/SnSe/Ag are promising candidates for neuromorphic computing applications. Here, the spike-timing dependent plasticity (STDP) application is demonstrated for the first time with a single memristor type operating as a synapse over a timescale of 10 orders of magnitude, from nanoseconds through seconds. This large dynamic range allows the memristors to be useful in applications that require slow biological times, as well as fast times such as needed in neuromorphic computing, thus allowing multiple functions in one design for one memristor type-a "one size fits all" approach. This work also investigated the effects of varying the spike pulse shapes on the STDP response of the memristors. These results showed that small changes in the pre- and postsynaptic pulse shape can have a significant impact on the STDP. These results may provide circuit designers with insights into how pulse shape affects the actual memristor STDP response and aid them in the design of neuromorphic circuits and systems that can take advantage of certain features in the memristor STDP response that are programmable via the pre- and postsynaptic pulse shapes. In addition, the energy requirement per memristor is approximated based on the pulse shape and timing responses. The energy requirement estimated per memristor operating on slower biological timescales (milliseconds to seconds) is larger (nanojoules range), as expected, than the faster (nanoseconds) operating times (~0.1 pJ in some cases). Lastly, the memristors responded in a similar manner under normal STDP conditions (pre- and post-spikes applied to opposite memristor terminals) as they did to the case where a waveform corresponding to the difference between pre- and post-spikes was applied to only one electrode, with the other electrode held at ground potential. By applying the difference signal to only one terminal, testing of the memristor in various applications can be achieved with a simplified test set-up, and thus be easier to accomplish in most laboratories.

Authors+Show Affiliations

Department of Electrical and Computer Engineering, Boise State University , Boise, ID , USA.Department of Electrical and Computer Engineering, Boise State University , Boise, ID , USA.Department of Electrical and Computer Engineering, Boise State University , Boise, ID , USA.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28083531

Citation

Campbell, Kristy A., et al. "Pulse Shape and Timing Dependence On the Spike-Timing Dependent Plasticity Response of Ion-Conducting Memristors as Synapses." Frontiers in Bioengineering and Biotechnology, vol. 4, 2016, p. 97.
Campbell KA, Drake KT, Barney Smith EH. Pulse Shape and Timing Dependence on the Spike-Timing Dependent Plasticity Response of Ion-Conducting Memristors as Synapses. Front Bioeng Biotechnol. 2016;4:97.
Campbell, K. A., Drake, K. T., & Barney Smith, E. H. (2016). Pulse Shape and Timing Dependence on the Spike-Timing Dependent Plasticity Response of Ion-Conducting Memristors as Synapses. Frontiers in Bioengineering and Biotechnology, 4, p. 97. doi:10.3389/fbioe.2016.00097.
Campbell KA, Drake KT, Barney Smith EH. Pulse Shape and Timing Dependence On the Spike-Timing Dependent Plasticity Response of Ion-Conducting Memristors as Synapses. Front Bioeng Biotechnol. 2016;4:97. PubMed PMID: 28083531.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Pulse Shape and Timing Dependence on the Spike-Timing Dependent Plasticity Response of Ion-Conducting Memristors as Synapses. AU - Campbell,Kristy A, AU - Drake,Kolton T, AU - Barney Smith,Elisa H, Y1 - 2016/12/26/ PY - 2016/08/03/received PY - 2016/12/14/accepted PY - 2017/1/14/entrez PY - 2017/1/14/pubmed PY - 2017/1/14/medline KW - ReRAM KW - STDP KW - ion-conductor KW - memristor KW - non-volatile memory SP - 97 EP - 97 JF - Frontiers in bioengineering and biotechnology JO - Front Bioeng Biotechnol VL - 4 N2 - Ion-conducting memristors comprised of the layered materials Ge2Se3/SnSe/Ag are promising candidates for neuromorphic computing applications. Here, the spike-timing dependent plasticity (STDP) application is demonstrated for the first time with a single memristor type operating as a synapse over a timescale of 10 orders of magnitude, from nanoseconds through seconds. This large dynamic range allows the memristors to be useful in applications that require slow biological times, as well as fast times such as needed in neuromorphic computing, thus allowing multiple functions in one design for one memristor type-a "one size fits all" approach. This work also investigated the effects of varying the spike pulse shapes on the STDP response of the memristors. These results showed that small changes in the pre- and postsynaptic pulse shape can have a significant impact on the STDP. These results may provide circuit designers with insights into how pulse shape affects the actual memristor STDP response and aid them in the design of neuromorphic circuits and systems that can take advantage of certain features in the memristor STDP response that are programmable via the pre- and postsynaptic pulse shapes. In addition, the energy requirement per memristor is approximated based on the pulse shape and timing responses. The energy requirement estimated per memristor operating on slower biological timescales (milliseconds to seconds) is larger (nanojoules range), as expected, than the faster (nanoseconds) operating times (~0.1 pJ in some cases). Lastly, the memristors responded in a similar manner under normal STDP conditions (pre- and post-spikes applied to opposite memristor terminals) as they did to the case where a waveform corresponding to the difference between pre- and post-spikes was applied to only one electrode, with the other electrode held at ground potential. By applying the difference signal to only one terminal, testing of the memristor in various applications can be achieved with a simplified test set-up, and thus be easier to accomplish in most laboratories. SN - 2296-4185 UR - https://www.unboundmedicine.com/medline/citation/28083531/Pulse_Shape_and_Timing_Dependence_on_the_Spike_Timing_Dependent_Plasticity_Response_of_Ion_Conducting_Memristors_as_Synapses_ L2 - https://doi.org/10.3389/fbioe.2016.00097 DB - PRIME DP - Unbound Medicine ER -