共查询到20条相似文献，搜索用时 15 毫秒
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Nguyen Van Toan Dong Zhao Naoki Inomata Takahito Ono 《IEEJ Transactions on Electrical and Electronic Engineering》2019,14(2):335-336
This letter reports the design, fabrication, and evaluation of logic gates including NAND and NOR gates which are composed of electrically driven nanoelectromechanical (NEM) switches. These logic gates are formed by four NEM switches consisting of four cantilevers, two input ports, two source ports, and an output. Devices are successfully fabricated by a combination of electron beam lithography, deep reactive ion etching (RIE), and selective tungsten (W) chemical vapor deposition. Truth tables of NAND and NOR are examined and demonstrated. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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基于细胞神经网络构造动态逻辑门是近年来一个全新的研究方向。由于非线性系统状态演化具有很强的非线性特征和丰富的动态模式,细胞神经网络在构建灵活、可重构的逻辑门电路中具有独特的优势。本文提出基于细胞神经网络的逻辑函数设计,首先设计了两输入线性可分布尔函数“与”门和“或”门的标准非耦合细胞神经网络的模板参数的求解过程,然后给出了使用运放实现的细胞电路设计以及功能之间转换的时序仿真结果。同时以此方式设计了另外12种两输入线性可分布尔函数的模板参数,实现了在电路结构不变的情况下,改变参数即能动态调整布尔逻辑的功能。 相似文献
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Michele Nocente Donald Fontanelli Pierpaolo Palestri David Esseni Luca Selmi 《International Journal of Circuit Theory and Applications》2010,38(6):607-629
This paper presents a new model for the frequency of oscillation, the oscillation amplitude and the phase‐noise of ring oscillators consisting of MOS‐current‐mode‐logic delay cells. The numerical model has been validated through circuit simulations of oscillators designed with a typical 130 nm CMOS technology. A design flow based on the proposed model and on circuit simulations is presented and applied to cells with active loads. The choice of the cell parameters that minimize phase‐noise and power consumption is addressed. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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Puneet Agrawal Dr. Bahniman Ghosh 《International Journal of Circuit Theory and Applications》2015,43(2):253-262
Current transistor‐based IC fabrication technology faces many trivial issues such as those of excess power dissipation, expensive fabrication and short channel effects at very low device size [1]. Quantum‐dot cellular automata (QCA)‐based digital electronics on the other hand provide scope for further development in the future by shrinking the device size. Current QCA logic circuits are based on logic synthesis using Inverters and (three or five input) Majority Gates. In this paper, a new design methodology has been described that can be used to create circuits with even greater device substrate densities than what are currently achieved in existing QCA designs. Based on the proposed methodology, a new QCA inverter is proposed. It is further tested through simulations on QCA Designer. Through the simulations, it is subsequently proved to be much more reliable and robust than the presently used common QCA inverter(s). In the second section of this paper, simple QCA circuits such as ring oscillators using odd number of inverters in daisy chains are described and designed using the proposed inverter design. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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P. Corsonello M. Lanuzza S. Perri 《International Journal of Circuit Theory and Applications》2014,42(1):65-70
An efficient technique for designing high‐performance logic circuits operating in sub‐threshold region is proposed. A simple gate‐level body biasing circuit is exploited to change dynamically the threshold voltage of transistors on the basis of the gate status. Such an auxiliary circuit prepares the logic gate for fast switching while maintaining energy efficiency. If 200 aJ is the target total energy per operation consumption, a two input NAND (NOR) gate designed as described here shows a delay reduction between 20% (16%) and 40% (48%), with respect to previously proposed sub‐threshold approaches. Copyright 2012 John Wiley & Sons, Ltd. 相似文献
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超导限流器对感应电动机负载的影响分析 总被引：1，自引：0，他引：1
随着高温超导技术的发展,超导限流器成为研究热点之一。针对一种新型桥路高温超导限流器,分析了其对感应电动机启动及短路故障动态过程的影响,建立了含超导限流器的感应电动机的电磁暂态方程。基于Matlab的Simulink平台进行了仿真研究,并结合实验室超导限流器样机进行实验研究,仿真和试验结果表明超导故障限流器可以有效限制启动电流和故障电流,可以缓解大容量电动机启动困难及在短路故障时向短路点提供短路电流问题。 相似文献
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本文分析研究了基于电感或变压器绕组电压积分的间接电流型控制技术,通过对电感或变压器绕组的电压积分,可以将交变的脉冲波积分成三角波,该三角波能表征开关电流的变化规律,因此可以作为PWM的三角载波,从而实现占空比的调节。文中以推挽正激变换器拓扑为例,对其进行了原理实验研究。 相似文献
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S. S. Gupta R. K. Sharma D. R. Bhaskar R. Senani 《International Journal of Circuit Theory and Applications》2010,38(2):131-147
Employing a state‐variable synthesis, a number of new current‐mode oscillators with explicit current output have been derived, which can be practically implemented from commercially available current‐feedback op‐amps (CFOA). The workability of the proposed structures has been confirmed by experimental results using AD844‐type CFOAs and some sample results have been presented. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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逆变器驱动电机系统中不同接地情况下的共模耦合电流路径 总被引：1，自引：0，他引：1
分析了逆变器驱动电机系统中的共模电压、高频情况下电机内部的共模耦合通道以及共模电压在这些通道中产生的共模电流。详细分析了系统在不同接地情况下的共模电流的流向及其防护。电机双端轴承绝缘并且电机轴碳刷接地,可构成对轴承电流的最佳防护。 相似文献
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针对由于逆变器驱动电机系统中的PWM电压具有高频和高dv／dt的特性,在电机内部产生共模耦合效应,并产生共模耦合电流流过电机内部的寄生电容这一特点,通过建立的分布参数电路模型和等效的集总参数电路模型,研究了电机内部高频情况下的共模耦合效应,分析了共模耦合电流的基本特性,给出了共模耦合电流的计算方法,对三相系统中的耦合电流进行了试验研究,并讨论了耦合电流对系统性能的影响。结果表明,耦合电流伴随电压的跳变而产生。呈双频振荡,引起电压和电流的畸变,并将引起电机绕组的过电压。 相似文献
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针对某500kV变电站2号主变复役操作过程中,当拉开2号主变220 k V侧接地闸刀后,出现直流接地报警,合上该接地闸刀,直流接地告警消失的异常情况,经过分析查找,发现与该主变220 k V侧接地闸刀有联闭锁关系的2号主变2号电容器3221闸刀机构箱内的热继电器F1两副接点间内绝缘异常,导致直流串入闸刀交流控制回路。阐述了具体的故障处理过程,并给出了变电站在设计、施工、运维过程中防止直流接地的注意事项。 相似文献
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在简要介绍互感器建模的主要方法与特点后,本文提出了一种基于电磁式电流互感器(CT)阻频特性的建模方法,能有效侦测互感器内部潜故障和轻微故障.文末采用实例对该方法进行了验证和总结. 相似文献
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分析了开关磁阻电动机调速系统(SRD)的工作原理及开关磁阻电动机(SRM)的非线性电感模型.在此基础上,对其进行了简化处理,并采用模糊控制器对SRM的开关角进行实时补偿,同时建立了基于电流斩波控制的四相SRM非线性仿真模型,通过仿真验证了该控制方式的正确性,证明了该模型不但计算相对简单且能有效减小转矩脉动和提高系统的动... 相似文献
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分析了逆变器驱动电机系统中的共模电压、高频情况下电机内部的共模耦合通道以及共模电压在这些通道中产生的共模电流。详细分析了系统在不同接地情况下的共模电流的流向及其防护。电机双端轴承绝缘并且电机轴碳刷接地,可构成对轴承电流的最佳防护。 相似文献
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Ahmed M. Soliman 《International Journal of Circuit Theory and Applications》2007,35(4):463-467
A voltage mode Tow Thomas bi‐quadratic filter using the inverting second‐generation current conveyor (ICCII) is given. The filter has high input impedance, employs two grounded capacitors, and has independent control on Q, independent control on the band‐pass and low‐pass response gain. Three alternative current mode filters are generated from the voltage mode circuit. The three circuits have zero input impedance, employ grounded capacitors and have independent control on Q. Two of the circuits have also all resistors grounded and the other uses only ICCII?and has only one floating resistor. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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Taichi Hidaka Muneaki Ishida Takamasa Hori Hideki Fujita 《Electrical Engineering in Japan》2001,135(1):65-76
This paper deals with the high‐frequency equivalent circuits in an induction motor driven by a PWM inverter. The leakage current flows through stray capacitance among stator windings and iron core (frame) of the induction motor at the switching instants of the inverter transistors. The high‐frequency equivalent circuits are derived based on the frequency characteristics of the high‐frequency zero‐phase impedance and line‐to‐line impedance of the induction motor. The validity of the derived equivalent circuits is confirmed by simulation and experimental results. © 2001 Scripta Technica, Electr Eng Jpn, 135(1): 65–76, 2001 相似文献
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讨论了IEC 61850系列标准中的变电站配置描述语言(SCL)在变电站自动化系统中对智能电子设备(IED)进行配置的若干实践问题,指出了该标准提供的SCL Schema中可能存在的某些前后一致性的问题及个别疏漏,包括:如何表达具有2种或以上功能约束值的数据属性;SBO等大写字母开头的属性名与Schema的属性名规范是否符合的问题;各种控制块元素的datSet属性的空值问题;ConfDataSet元素类型错误;简单单位枚举\"SIUnit\"中第38号和第62号重复使用W表示的问题.对这些问题给出了相应的解决方法和建议. 相似文献