44-51

UDC 681.32
DOI: 10.15350/2306-2819.2018.1.44

THRESHOLD ELEMENTS AND HYSTERESIS TRIGGERS OF ASYNCHRONOUS CIRCUITS

S. F. Tyurin^1,2
¹Perm National Research Polytechnic University,
7, Professor Pozdeev Street, Perm, 614013, Russian Federation
²Perm National Research State University,
15, Bukirev Street, Perm, Russian Federation, 614990
E-mail:tyurinsergfeo@yandex.ru

ABSTRACT

Introduction. At the present time threshold elements, offered for the creation of artificial neural networks by McCulloch in 1943, are widely used in neurocomputing. They are also applied in analog-to-digital information conversion. The special direction is threshold elements with the memory, first offered by D. Muller within asynchronous information processing. It is a so-called hysteresis trigger, used in the self-timed circuitry at the present time. The purpose of the article is the research on the features of these triggers and opportunities of their use in fail-safe self-timed circuits. As the tasks of the research, hysteresis triggers with two, three and four inputs are considered. The functions of transition are obtained, hysteresis visualization for two and three input hysteresis triggers and different types of CMOS (complementary metal-oxide semiconductor) circuits of hysteresis triggers are done. The special attention is paid to the threshold element TH23, which is triggered at two unities but it is reset to zero in case of all inputs nulling. This operation can be useful in fail-safe systems with three channels, but it doesn’t consider reset errors (failures, faults). However the attempt of this threshold element creation results in the circuit without the memory. This is due to the fact that the number of inputs is odd. The hysteresis trigger with four inputs and the operating threshold both at the setting and the reset is offered. The function of transitions of this trigger and the corresponding CMOS circuit are obtained. It is expedient to use this trigger when realizing self-timed circuits either in FPGA or in full-custom microcircuits. The problems of FPGA realization (field programmable gate arrays) merit special research. As further directions of research, the development of hysteresis triggers with a larger number of inputs can be mentioned.

KEYWORDS

threshold element; hysteresis trigger; asynchronous circuit; function of transition

FULL TEXT (pdf)

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For citation: Tyurin S. F. Threshold Elements and Hysteresis Triggers of Asynchronous Circuits. Vestnik of Volga State University of Technology. Ser.: Radio Engineering and Infocommunication Systems. 2018. No 1 (37). Pp. 44-51. DOI: 10.15350/2306-2819.2018.1.44