Emulation of spike-timing dependent plasticity in nano-scale phase change memory

NEUROCOMPUTING

卷:155

Article

Kang, Dae-Hwan¹  Jun, Hyun-Goo¹  Ryoo, Kyung-Chang¹  Jeong, Hongsik²  Sohn, Hyunchul³ 

[1] Samsung Elect Co Ltd, Semicond Business, Memory Div, Hwaseong Si 445330, Gyeonggi Do, South Korea

[2] Yonsei Univ, Yonsei Inst Convergence Technol, Inchon 406840, South Korea

[3] Yonsei Univ, Dept Mat Sci & Engn, Seoul 120749, South Korea

关键词: Spike-timing dependent plasticity;    Two-phase change memory cells;    Long-term potentiation;    Long-term depression;    Electronic synapses;   

DOI  :  10.1016/j.neucom.2014.12.036

来源: Elsevier

【 摘 要 】

The spike-timing dependent plasticity (STDP) of biological synapses, which is known to be a function of the formulated Hebbian learning rule of human cognition, learning and memory abilities, was emulated with two-phase change memory (2-PCM) cells built with 39 nm technology. For this, we designed a novel time-modulated voltage (TMV) scheme for changing the conductance of 2-PCM cells, that could produce both long-term potentiation (LTP) and long-term depression (LTD) by applying variable (decreasing/increasing) pulse voltages according to the sign and magnitude in time interval between pre- and post-spikes. Since such schemes can be easily modified to have a variety of pulse shapes and time intervals between pulses, it is expected to be a proper scheme for designing diverse synaptic connection abilities. In addition, the small form factor and low energy consumption of 2-PCM make them comparable to biological synapses, which makes phase change memory a promising candidate for electronic synapses in large-scale neuromorphic system applications. (C) 2015 The Authors. Published by Elsevier B.V.

【 授权许可】

Free