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Title: An efficient analog Hamming distance comparator realized with a unipolar memristor array: a showcase of physical computing
Authors: Ge, Ning
Yoon, Jung Ho
Hu, Miao
Merced-Grafals, E. J.
Davila, Noraica
Strachan, John Paul
Li, Zhiyong
Holder, Helen
Xia, Qiangfei
Williams, R. Stanley
Zhou, Xing
Yang, J. Joshua
Keywords: Electrical and electronic engineering
Nanoscale devices
Issue Date: 2017
Source: Ge, N., Yoon, J. H., Hu, M., Merced-Grafals, E. J., Davila, N., Strachan, J. P., et al. (2017). An efficient analog Hamming distance comparator realized with a unipolar memristor array: a showcase of physical computing. Scientific Reports, 7, 40135-.
Series/Report no.: Scientific Reports
Abstract: We propose and demonstrate a novel physical computing paradigm based on an engineered unipolar memristor that exhibits symmetric SET switching with respect to voltage polarity. A one-dimensional array of these devices was sufficient to demonstrate an efficient Hamming distance comparator for two strings of analog states represented by voltages from the physical world. The comparator first simultaneously applies the two sets of voltages to the array of memristors, each of which is initially in its high resistance state and switches to its low resistance state only if the two voltages applied on that memristor differ by more than the switching threshold. An accurate analog representation of the Hamming distance is then obtained by applying a reading voltage to the memristors and summing all the resultant currents. The comparator with a small footprint can directly process analog signals and store computation results without power, representing a promising application for analog computing based on memristor crossbar arrays.
ISSN: 2045-2322
DOI: 10.1038/srep40135
Schools: School of Electrical and Electronic Engineering 
Rights: © 2017 The Author(s) (Nature Publishing Group). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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