共查询到20条相似文献，搜索用时 46 毫秒
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THYLEN L. HE Sailing WOSINSKI L. DAI Daoxin 《浙江大学学报(A卷英文版)》2006,7(12):1961-1967
We formulate a ＂Moore＇s law＂ for photonic integrated circuits （PICs） and their spatial integration density using two methods. One is decomposing the integrated photonics devices of diverse types into equivalent basic elements, which makes a comparison with the generic elements of electronic integrated circuits more meaningful. The other is making a complex component equivalent to a series of basic elements of the same functionality, which is used to calculate the integration density for functional components realized with different structures. The results serve as a benchmark of the evolution of PICs and we can conclude that the density of integration measured in this way roughly increases by a factor of 2 per year. The prospects for a continued increase of spatial integration density are discussed. 相似文献
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邓宽林 《十堰职业技术学院学报》2003,16(2):78-79
引入受控元件输入、输出端和输入、输出回路和放大电路输入、输出端和输入、输出回路的概念，根据它们的连接规律来确定反馈的类型，既形象，又直观，而且使用起来快捷、准确。 相似文献
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关于"Protel 99 SE"教学的探讨 总被引：2，自引：0，他引：2
刘秋艳 《天津职业院校联合学报》2006,8(2):75-77
探讨学生在学习Protel 99 SE时易犯的一些错误,以及教师在教学中应注意的几点问题。 相似文献
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This paper presents a novel low-pass filter （LPF） with sharp rejection, wide stopband and compact size, which are realized by the defected ground structure （DGS） and the defected microstrip structure （DMS）. The equivalent circuit model is proposed and the circuit parameters are extracted by the circuit simulation software. The parameters measured are 3 dB cutoff frequency fc of 5.2 GHz, the insertion loss less than 0.5 dB from DC to 4.0 GHz and S21 less than -20 dB within the wide stopband from 6 GHz to 16 GHz. The results of the circuit optimization agree well with those of the full wave simulation and the measured ones, which validate the effectiveness of the equivalent circuit model. The size of the proposed LPF is decreased compared with normal LPF. This LPF can be applied in rectennas to eliminate high order harmonics. 相似文献
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A new type of fault current limiter (FCL) based on triggered vacuum switch (TVS) is proposed in this paper. The TVS-based
FCL (TFCL) is mainly composed of a capacitor, a current-limiting reactor connected with a capacitor in series and a TVS connected
with a capacitor in parallel. With the TVS at off or on state, the whole TFCL behaves as a conventional series compensator
or a fault current limiter, respectively. Numerical simulation and prototype experiment based on LC resonant test circuit
show that it is feasible to develop TFCL.
Supported by the Foundation of Chen-guang Project of the Wuhan Municipal Commission of Education 相似文献
7.
Reconfiguration is the key to produce an applicable ternary optical computer (TOC). The method to implement the reconfiguration
function determines whether a TOC can step into applied fields or not. In this work, a design of the reconfiguration circuit
based on field programmable gates array (FPGA) is proposed, and the structure of the entire hardware system is discussed. 相似文献
8.
肖丽仙 《楚雄师范学院学报》2006,21(6):17-19,33
在电子线路实验教学中,利用传统的实验手段有时对部分实验现象和结果难于观察、测量。本文介绍了利用EWB进行电子线路仿真的基本方法,并通过实例多谐振荡器和施密特触发器进行了仿真。实验证明EWB在电子线路实验教学中具有重要的使用价值。 相似文献
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印制电路板(printed circuit board,PCB)是电子设备内部电子元件的主要载体。PCB设计和加工工艺是高校电子类专业学生必须掌握的专业技能,但是专业工厂批量加工PCB的工艺并不适合在高校实验室使用。给出了一种适合在校学生快速制作PCB的工艺路线,重点解决了"一图一板"加工中绿油阻焊膜和元器件标志快速印制的难题。 相似文献
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许胜辉 《实验室研究与探索》2011,30(11)
介绍了一种基于DSP技术的可同步重合闸智能断路器.它采用傅里叶级数的滤波算法来判断最佳重合闸角,从而减弱重合闸时的瞬时电流.在探讨DSP技术的基础上,对该硬件电路和软件进行了设计,仿真结果与预期吻合较好. 相似文献
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This paper explores and proposes a design solution of an integrated skip cycle mode (SCM) control circuit with a simple structure. The design is simulated and implemented with XD10H-1.0μm modular DIMOS 650 V process. In order to meet the requirement of a wide temperature range and high yields of products, the schematic extracted from the layout is simulated with five process corners at 27℃and 90℃. Simulation results demonstrate that the proposed integrated circuit is immune to noise and achieves skipping cycle control when switching mode power supply (SMPS) works with low load or without load. 相似文献
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An adaptive ramp generator based on linear histogram was proposed for the built-in selftest （BIST） of analog to digital convertor （ADC） in CMOS image sensor. By comparing the generated ramp signal to a reference voltage and feeding back a calibration signal, the slope adjustment was implemented, and high linearity and precision of ramp slope were realized. By modulating the pulse width and reference voltage, sweep length varied from microsecond to second and signal swing could reach 3 V with 5.6 mW power consumption. The ramp was used as input to an ideal 10-bit single-slope ADC, and the corresponding DNL and INL were 0.032 LSB and 0.078 LSB, respectively. 相似文献
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Instead of avoiding occurrence of chaos in motor drives,chaos is positively utilized in this paper.A new chaotic pulse width modulation (PWM) scheme is proposed and implemented for AC motors,which functions to significantly suppress harmonic peaks and hence acoustic noise.The key is to employ the Chua's circuit for generating a desired chaotic sequence.By using a practical induction motor,computer simulation and experimental results verify that the chaotic PWM has advantages of harmonic peak suppression and simple hardware implementation over the conventional PWM and random PWM. 相似文献
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汤文利 《孝感职业技术学院学报》2014,(3):99-101
文章分析了PLC程序与继电器线路工作原理的差别,并用举例的方法说明照搬成熟的继电器控制线路进行PLC编程或照搬PLC程序连接继电器控制线路,都不能实现需要的逻辑功能。 相似文献
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Resonant tunneling diode （RTD） of AlAs/InGaAs/AlAs double barrier-single well structure was designed and fabricated. The devices showed current-voltage characteristics with peak-valley current ratio of 4 ： 1 at room temperature. The scattering parameter of RTD was measured by using an HP8510（C） network analyzer. Equivalent circuit parameters were obtained by curve fitting and optimized. The RTD switching time was estimated using the measured capacitance and average negative differential resistance. The minimum rise time of the sample was estimated to be 21 ps. 相似文献
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针对微弱重力信号测量中加速度计的数字输出接口电路应具有高分辨率的问题,引入了开关电容(SC)sigma-delta调制器(SDM).基于SDM的工作原理和拓扑结构,分析了过采样比、内部量化器位数以及级联结构对提高微弱信号检测精度的影响,设计了满足加速度计接口电路高分辨率要求的理想二阶1位低失真SDM结构.通过研究各模块... 相似文献
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近几年,随着电子技术的发展,很多新型彩色电视机都采用了I2C总线技术和新的电路,给电视机维修带来新的问题。本文通过一些维修实例和对一些新知识的理解,进一步浅析彩电微处理器(CPU)正常工作的条件。 相似文献
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Xiao-ling Yu Zhi-yuan Liu Quan-ke Feng Yi-jiang Wei Ji-mei Wang Xiang-jun Zeng 《浙江大学学报(A卷英文版)》2009,10(9):1305-1312
To enhance nominal current of high voltage vacuum circuit breakers （VCBs）, a gravity heat pipe was proposed to replace stationary conducting rod of a high voltage vacuum interrupter. The heat pipe is composed of two coaxis tubes： the external tube is made of oxygen-free copper and the inner tube is made of stainless steel. The bottom end of the inner stainless steel tube is connected to the external copper tube by holes. Transient and static thermal performance of the heat pipe was measured, and the thermal resistance of it was compared with that of a solid copper rod with the same dimensions. Experimental results showed that thermal resistance of the heat pipe was about 1/3 of that of the copper rod, and it decreased slightly with the rising of the input heat flux. 3D thermal simulation on a 126 kV/2000 A single break VCB was done to compare the thermal performance between the proposed gravity heat pipe and the copper rod serving as the stationary conducting rod of the vacuum interrupter. Simulation results revealed that in the heat pipe case, the maximum temperature between contacts was 67 ℃ lower than that in the copper rod case. 相似文献