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Title: On the Non-STDP Behavior and Its Remedy in a Floating-Gate Synapse
Authors: Gopalakrishnan, Roshan
Basu, Arindam
Keywords: Floating gate (FG); learning; neuromorphic; neuroscience; spike-timing-dependent plasticity (STDP); synapse; very large scale integration (VLSI)
Issue Date: 2015
Source: Gopalakrishnan, R., & Basu, A. (2015). On the Non-STDP Behavior and Its Remedy in a Floating-Gate Synapse. IEEE Transactions on Neural Networks and Learning Systems, 26(10), 2596-2601.
Series/Report no.: IEEE Transactions on Neural Networks and Learning Systems
Abstract: This brief describes the neuromorphic very large scale integration implementation of a synapse utilizing a single floating-gate (FG) transistor that can be used to store a weight in a nonvolatile manner and demonstrate biological learning rules such as spike-timing-dependent plasticity (STDP). The experimental STDP plot (change in weight against △t = tpost - tpre) of a traditional FG synapse from previous studies shows a depression instead of potentiation at some range of positive values of △t-we call this non-STDP behavior. In this brief, we first analyze theoretically the reason for this anomaly and then present a simple solution based on changing control gate waveforms of the FG device to make the weight change conform closely to biological observations over a wide range of parameters. The experimental results from an FG synapse fabricated in AMS 0.35-μm CMOS process design are also presented to justify the claim. Finally, we present the simulation results of a circuit designed to create the modified gate voltage waveform.
ISSN: 2162-237X
DOI: 10.1109/TNNLS.2015.2388633
Schools: School of Electrical and Electronic Engineering 
Rights: © 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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