Performance of HfO x - and TaO x -based Resistive Switching Structures for Realization of Minimum and Maximum Functions
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.377
Performance of HfOx- and TaOx-based Resistive Switching Structures for Realization of Minimum and Maximum Functions Karol Fröhlich1, Ivan Kundrata1, Michal Blaho1, Marian Precner1, Milan Ťapajna1, Martin Klimo2, Ondrej Šuch2, Ondrej Škvarek2 1
Institute of Electrical Engineering, SAS, Dúbravská cesta 9, 84104 Bratislava, Slovakia
University of Zilina, Department of InfoCom Networks, 01026 Žilina, Slovakia
2
ABSTRACT
In our contribution we present and analyze implementation of the resistive switching structures for logic application based on Zadeh fuzzy logic. Resistive switching structures based on HfOx and TaOx were connected in an anti-serial configuration (complementary resistive switch). The complementary resistive switches integrated into logic circuit for MinMax function implementation were analyzed using quasi-static voltage sweeps. We have shown that the accuracy of the Min/Max function determination depends on the ratio of the high and low resistivity states of the single switches. Determination of the Min/Max values is relevant only above the threshold voltage of the resistive structures. Reproducibility of the Min/Max function constructed from the resistive switching structures is demonstrated.
INTRODUCTION Resistive switching has attracted lot of interest in the last period because these structures can be used as a basic element of non-volatile memories [1]. Resistivity switching based random access memories offer several advantages including low operating current, high speed, non volatility and high scalability. Complementary resistive switch (CRS), composed of two anti-serially connected resistive switches was introduced to avoid undesired sneak-path currents in a crossbar-array architecture [2]. Besides memory applications, resistive switching structures can be used for logic applications [3-5]. In ref. [6] it was shown, that the CRS device in a three terminal configuration (with the access to the middle electrode) is able to compute minimum or maximum of the input values. Consequently, it was suggested that these resistive switching based devices are able to implement basic functions of the fuzzy logic: Min and Max. Fuzzy logic introduced in 1965 by Lofti Zadeh [7] is based on the notion of a fuzzy set, where association of an element to the fuzzy set is described by its membership function. Basic operations with the fuzzy sets (union, intersection) were defined using Min and Max functions. In his pioneering work he already identified that
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the notion of a fuzzy set may have a wide scope of applicability in the fields of pattern classification and information processing. Specific peculiarity of the fuzzy logic is capability to process data that are not precise but rather fuzzy. Ei
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