192 research outputs found
Analytic Approach to the Operation of RTD Ternary Inverters Based on MML
Open Access.Multiple-valued Logic (MVL) circuits are one of the most attractive applications of the Monostable-to-Multistable transition Logic (MML), and they are on the basis of advanced circuits for communications. However, a proper design is not inherent to the usual MML circuit topologies. This paper analyses the case of an MML ternary inverter, and determines the relations that circuit representative parameters must verify to obtain a correct behaviour.This work has been funded by the Spanish Government under project NDR, TEC2007- 67245/MIC, and the Junta de AndalucÃa through the Proyecto de Excelencia TIC-2961.Peer Reviewe
Towards understanding two-level-systems in amorphous solids -- Insights from quantum circuits
Amorphous solids show surprisingly universal behaviour at low temperatures.
The prevailing wisdom is that this can be explained by the existence of
two-state defects within the material. The so-called standard tunneling model
has become the established framework to explain these results, yet it still
leaves the central question essentially unanswered -- what are these two-level
defects? This question has recently taken on a new urgency with the rise of
superconducting circuits in quantum computing, circuit quantum electrodynamics,
magnetometry, electrometry and metrology. Superconducting circuits made from
aluminium or niobium are fundamentally limited by losses due to two-level
defects within the amorphous oxide layers encasing them. On the other hand,
these circuits also provide a novel and effective method for studying the very
defects which limit their operation. We can now go beyond ensemble measurements
and probe individual defects -- observing the quantum nature of their dynamics
and studying their formation, their behaviour as a function of applied field,
strain, temperature and other properties. This article reviews the plethora of
recent experimental results in this area and discusses the various theoretical
models which have been used to describe the observations. In doing so, it
summarises the current approaches to solving this fundamentally important
problem in solid-state physics.Comment: 34 pages, 7 figures, 1 tabl
Investigation of Multiple-valued Logic Technologies for Beyond-binary Era
Computing technologies are currently based on the binary logic/number system, which is dependent on the
simple on and off switching mechanism of the prevailing transistors. With the exponential increase of data
processing and storage needs, there is a strong push to move to a higher radix logic/number system that
can eradicate or lessen many limitations of the binary system. Anticipated saturation of Moore’s law and
the necessity to increase information density and processing speed in the future micro and nanoelectronic
circuits and systems provide a strong background and motivation for the beyond-binary logic system. In this
review article, different technologies for Multiple-valued-Logic (MVL) devices and the associated prospects
and constraints are discussed. The feasibility of the MVL system in real-world applications rests on resolving
two major challenges: (i) development of an efficient mathematical approach to implement the MVL logic
using available technologies, and (ii) availability of effective synthesis techniques. This review of different
technologies for the MVL system is intended to perform a comprehensive investigation of various MVL technologies and a comparative analysis of the feasible approaches to implement MVL devices, especially ternary
logic
Multiple-valued logic: technology and circuit implementation
Title from PDF of title page, viewed March 1, 2023Dissertation advisors: Masud H. Chowdhury and Yugyung LeeVitaIncludes bibliographical references (pages 91-107)Dissertation (Ph.D.)--Department of Computer Science and Electrical Engineering. University of Missouri--Kansas City, 2021Computing technologies are currently based on the binary logic/number system, which is dependent on the simple on and off switching mechanism of the prevailing transistors. With the exponential increase of data processing and storage needs, there is a strong push to move to a higher radix logic/number system that can eradicate or lessen many limitations of the binary system. Anticipated saturation of Moore's law and the necessity to increase information density and processing speed in the future micro and nanoelectronic circuits and systems provide a strong background and motivation for the beyond-binary logic system. During this project, different technologies for Multiple-Valued-Logic (MVL) devices and the associated prospects and constraints are discussed. The feasibility of the MVL system in real-world applications rests on resolving two major challenges: (i) development of an efficient mathematical approach to implement the MVL logic using available technologies and (ii) availability of effective synthesis techniques. The main part of this project can be divided into two categories: (i) proposing different novel and efficient design for various logic and arithmetic circuits such as inverter, NAND, NOR, adder, multiplexer etc. (ii) proposing different fast and efficient design for various sequential and memory circuits. For the operation of the device, two of the very promising emerging technologies are used: Graphene Nanoribbon Field Effect Transistor (GNRFET) and Carbon Nano Tube Field Effect Transistor (CNTFET). A comparative analysis of the proposed designs and several state-of-the-art designs are also given in all the cases in terms of delay, total power, and power-delay-product (PDP). The simulation and analysis are performed using the H-SPICE tool with a GNRFET model available on the Nanohub website and CNTFET model available from Standford University website.Introduction -- Fundamentals and scope of multiple valued logic -- Technological aspect of multiple valued logic circuit -- Ternary logic gates using Graphene Nano Ribbon Field Effect Transistor (GNRFET) -- Ternary arithmetic circuits using Graphene Nano Ribbon Field Effect Transistor (GNRFET) -- Ternary sequential circuits using Graphene Nano Ribbon Field Effect Transistor (GNRFET) -- Ternary memory circuits using Carbon Nano Tube Field Effect Transistor (CNTFET) -- Conclusions & future wor
Technological Solution beyond MOSFET and Binary Logic Device
Title from PDF of title page viewed January 31, 2019Thesis advisor: Masud ChowdhuryVitaIncludes bibliographical references (pages 64-70)Thesis (M.S.)--School of Computing and Engineering, University of Missouri--Kansas City, 2018Today’s technology is based on the binary number system-based circuitry, which
is the outcome of the simple on and off switching mechanism of the prevailing transistors.
Consideration of higher radix number system can eradicate or lessen many limitations of
binary number system such as the saturation of Moore’s law. The most substantial potential
benefits of higher radix approaches are the decrease of wiring complexity. Excessive
scaling of the technologies has led the researchers beyond Binary Logic and MOSFET
technology.
TFET considered as one of the most promising options for low-power application
for beyond MOSFET technologies. Graphene Nano Ribbon, due to its high-carrier
mobility, tunable bandgap and its outstanding electrostatic control of device gate becomes
ideal choice for channel material of TFET. This paper proposes double gated ultra-thin
body (UTB) TFET device model using Graphene nano ribbon as the channel material. In
this paper evaluation of the model by performing the comparative analysis with InAs as
the channel material in terms of Ec-Ev on and off state and Id-Vg characteristics is
presented.
The feasibility of multi valued logic system in real-world rests on two serious
aspects, such as, the easiness of mathematical approach for implementing the multivalued
logic into today’s technology and the sufficiency of synthesis techniques. In this paper, we
have focused on the different technology available for implementing multivalued logic
especially ternary logic. Ternary logic devices are expected to lead to an exponential
increase of the information handling capability, which binary logic cannot support.
Memory capacitor or memcapacitor is an emerging device that exhibits hysteresis
behavior, which can be manipulated by external parameters, such as, the applied electric
field or voltage. One of the unique properties of the memcapacitor is that by using the
percolation approach, we can achieve Metal-Insulator-Transition (MIT) phenomenon,
which can be utilized to obtain a staggered hysteresis loop. For multivalued logic devices
staggered hysteresis behavior is the critical requirement. In this paper, we propose a new
conceptual design of a ternary logic device by vertically stacking dielectric material
interleaved with layers of graphene nanoribbon (GNR) between two external metal plates.
The proposed device structure displays the memcapacitive behavior with the fast switching
metal-to-insulator transition in picosecond scale. The device model is later extended into a
vertical-cascaded version, which acts as a ternary device.Introduction -- Multi valued logic -- Overview of different MVL technologies -- Graphene memcapacitor based ternary logic device -- Graphene nano ribbon based TFET -- Conclusion and future wor
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