共查询到20条相似文献,搜索用时 62 毫秒
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本文提出一种新颖的高精度宽范围可调的LED恒流驱动控制器的设计,与传统的恒流驱动电路不同,该电路采用漏端电压固定的MOS管代替传统的镜像电阻,并加入运放负反馈结构来保证所有镜像器件的端电压完全相等,得到不受输出端负载电压影响的精确可调的输出电流。同时通过新颖的电流分段镜像(CSM)机制,优化了镜像MOS管的电气特性,从而保证了高精度输出电流的宽范围。基于该方案采用TSMC 0.6μm BCD工艺设计实现了一款面积为1.1×0.7mm2的三通道LED恒流源驱动芯片。投片测试结果表明,该LED驱动控制器工作状态良好,输出电流范围为5mA~60mA,电流精度的相对误差小于1%,通道间电流匹配的相对误差不超过1.5%。 相似文献
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一种反激式LED恒流驱动电路的设计与实现 总被引:1,自引:1,他引:0
设计了一种输出功率达120W的反激式变换LED恒流驱动电路,其输出电压范围为33~37V,可为120只功率为1W的LED管采用10串12并混联方式组成的LED阵列提供驱动电流。对其功率因数校正电路、反激式变换电路、恒流控制电路进行了设计和试制,性能测试表明,其输出恒流效果较好,电流稳定度约2.7%,输出电压纹波低,可用于恒流驱动混联方式组成的多只LED阵列。 相似文献
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新型电流控制电流传输器 总被引:1,自引:0,他引:1
提出了一种新型电流控制电流传输器(CCCII)电路。该CCCII电路由跨导线性环电路和双极性Wilson电流镜构成。为实现该新型CCCII电路,还提出了双端输出的双极型Wilson电流镜。该CCCII电路具有输出阻抗高、电压及电流传输精度高、易于实现、便于集成等优点。文中分析了电路的工作原理,给出了实验结果,验证了电路的正确性。 相似文献
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王春华 《固体电子学研究与进展》2005,(4)
为了实现结构简单、便于集成的三输入单输出电流模式滤波器,提出了三输入单输出电流模式滤波器的信号流图。用CC(第二代电流传输器)及多端输出的电流镜实现了该信号流图,得到一个由CC及电流镜共同构成的电流模式滤波器。该滤波器由2个CC、1个三端输出的电流镜及4个RC元件构成,能方便地实现5种滤波器输出。该滤波器可用于通信、电子测量与仪器仪表中的信号处理。硬件实验结果表明提出的电路是正确的。 相似文献
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王春华 《固体电子学研究与进展》2005,25(4):536-539
为了实现结构简单、便于集成的三输入单输出电流模式滤波器,提出了三输入单输出电流模式滤波器的信号流图。用CCⅡ(第二代电流传输器)及多端输出的电流镜实现了该信号流图,得到一个由CCⅡ及电流镜共同构成的电流模式滤波器。该滤波器由2个CCⅡ、1个三端输出的电流镜及4个RC元件构成,能方便地实现5种滤波器输出。该滤波器可用于通信、电子测量与仪器仪表中的信号处理。硬件实验结果表明提出的电路是正确的。 相似文献
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一种高精度电流检测电路的设计 总被引:1,自引:0,他引:1
针对常用电流模式的升压转换器结构,提出了一种高精度电流检测电路。该电路在保证响应速度的前提下,通过增加电路环路增益,降低误差源等方法,提高检测电路的电流检测精度。与其他结构电路相比,有结构简单,响应速度快,电流检测精度高的优点。基于Chartered的0.35μm的3.3V/13.5V CMOS工艺,使用Spectre仿真器,对该电路进行了仿真与验证。结果证明,在输入电压为2.5V~5.5V,电感电流为100mA~500mA,工作频率为1MHz的情况下,能够正常稳定工作,并且电流精度高达93%。 相似文献
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Mixed-signal or analog chips often require a wide range of biasing currents that are independent of process and supply voltage and that are proportional to absolute temperature. This paper describes CMOS circuits that we use to generate a set of fixed bias currents typically spanning six decades at room temperature down to a few times the transistor off-current. A bootstrapped current reference with a new startup and power-control mechanism generates a master current, which is successively divided by a current splitter to generate the desired reference currents. These references are nondestructively copied to form the chip’s biases. Measurements of behavior, including temperature effects from 1.6 and 0.35 μ implementations, are presented and nonidealities are investigated. Temperature dependence of the transistor off-current is investigated because it determines the lower limit for generated currents. Readers are directed to a design kit that allows easy generation of the complete layout for a bias generator with a set of desired currents for scalable MOSIS CMOS processes.Tobi Delbrück is a group leader at the Inst. of Neuuroinformatics (INI), part of ETH Zurich and the University of Zurich, Switzerland. His main interest is in developing application-specific low-power vision sensor chips. In 1993 he graduated with a PhD in Computation and Neural Systems from Caltech, where he worked in Carver Mead’s laboratory. He co-invented with Mead a widely-used adaptive photoreceptor circuit and invented the bump circuit. Subsequently he worked for several years for Arithmos, Synaptics, National Semiconductor, and Foveon, where he was one of the founding employees. In 1998 he moved to Switzerland to join INI. In 2002 he was lead developer of a tactile luminous floor used in INI’s exhibit “Ada: Playful Intelligent Space” experienced by more than a half million visitors to the Swiss National Exhibition. He has been awarded 7 patents, and has written or coauthored 8 journal papers, 14 peer-reviewed conference papers, 4 book chapters, and 1 book.André van Schaik obtained his M.Sc. in electronics from the University of Twente in 1990. In 1991–1994he worked at CSEM, Neuchâtel, Switzerland, in the Advanced Research group of prof. Eric Vittoz. In this period he designed several analogue VLSI chips for perceptive tasks, some of which have been industrialised. A good example of such a chip is the artificial, motion detecting, retina in Logitech’s Trackman Marble TM.From 1994 until 1998, he was a research assistant and Ph.D. student with Prof. Vittoz at the Swiss Federal Institute of Technology in Lausanne (EPFL). The subject of his Ph.D. research was the development of analogue VLSI models of the auditory pathway. In 1998 he was a post-doctorate research fellow at the Auditory Neuroscience Laboratory at the University of Sydney.In April 1999 he became a Senior Lecturer in Computer Engineering for the School of Electrical & Information Engineering at the University of Sydney. He is now a Reader in the same School and Head of the Computing and Audio Research Laboratory. His research interests include analogue VLSI, neuromorphic systems, wireless sensor networks, human sound localisation, and virtual reality audio systems. 相似文献
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提出了一种新型的电流控制第二代电流传输器电路。该电路由6个复合管改进型电流镜和1个跨导线性环组成,该电路的电流传输精度远高于基于基本电流镜和级联电流镜实现的电流控制第二代电流传输器(CCCII)的电流传输精度。对电路原理进行了分析,并进行了硬件实验,实验结果表明频率在0~1.3MHz范围内能很好地满足CCCII的电流和电压特性关系,从而证明提出的电路是正确的。 相似文献
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提出了一种新型的电流控制第二代电流传输器电路。该电路由6个复合营改进型电流镜和1个跨导线性环组成.该电路的电流传输精度远高于基于基本电流镜和级联电流镜实现的电流控制第二代电流传输器(CCCII)的电流传输精度。对电路原理进行了分析,并进行了硬件实验,实验结果表明频率在0-1.3MHz范围内能很好地满足CCCII的电流和电压特性关系,从而证明提出的电路是正确的。 相似文献
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雷电流是描述闪电放电最重要的物理量,对于雷电防护相关研究意义重大,因此,雷电流测量一直是雷电研究领域的基础性工作。为了获得自然雷电流全波波形,在南京第一高楼紫峰大厦(约450 m)楼顶的避雷针处安装了一套雷电流全波测量系统,用于长期检测雷击建筑物回击电流和建筑物上行先导电流。该系统包含两套子系统,分别由雷电流传感器、数据传输系统、数据采集系统、远程控制系统构成,能够同时测量回击电流和建筑物上行先导电流,对国内特别是华东地区高塔自然雷电流研究具有重大意义。首先对所安装的雷电流测量系统进行了介绍,对测得的两组上行先导电流波形进行了全面分析,得出高建筑物上行先导电流波形的相关特征。 相似文献