首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   21篇
  国内免费   4篇
  完全免费   5篇
  无线电   30篇
  2017年   1篇
  2013年   3篇
  2012年   4篇
  2011年   2篇
  2010年   4篇
  2009年   1篇
  2008年   3篇
  2007年   4篇
  2006年   1篇
  2005年   3篇
  2004年   1篇
  2003年   1篇
  2002年   1篇
  2000年   1篇
排序方式: 共有30条查询结果,搜索用时 78 毫秒
1.
反激开关电源中基于PC817A与TL431配合的环路动态补偿设计   总被引:2,自引:0,他引:2  
开关电源市场中占很大份额的单端反激开关电源通常采用PC817A与TL431配合来组成控制环路.然而,目前设计这个环路的动态补偿参数,基本上采用试验方法.文中利用开关电源的小信号传递函数,对此环路的动态补偿进行了定性分析和定量计算,通过设计合适的相位裕量来保证开关电源的稳定性.其过程经实验证明具有较好的通用性,在实际应用中取得了很好的效果.  相似文献
2.
PID参数自整定方法概述   总被引:1,自引:0,他引:1  
何颖  鹿蕾  赵争鸣 《现代电子技术》2004,27(24):20-23,29
PID控制是最通用的控制方法,其简易性、鲁棒性、应用广泛以及近似最优的性能是PID控制流行于学术界和工业部门的几个原因。最近,PID控制器整定不佳的问题引人注目,也有人在努力系统地解决此问题。本文扼要概述了PID的理论,然后讨论了一些常用PID整定方法,并对新技术尝试着进行了探索。  相似文献
3.
基于SIMULINK的开关型Σ-Δ调制器行为级建模   总被引:1,自引:0,他引:1       下载免费PDF全文
欧伟  吴晓波 《半导体学报》2008,29(11):2209-2217
为精确反映多种非理想因素对开关型Σ-Δ调制器的影响,提高其在SIMULINK仿真器下的仿真精度,针对 SIMULINK的行为级建模提出一种新的积分器模型. 主要的改进之处包括:在运放模块中引入了有关直流增益非线性及信号建立过程非理想性的考虑,在开关模块中引入了电荷注入效应和导通阻抗的信号相关性影响,并将噪声模型作为独立模块引入系统. 应用该模型进行SIMULINK仿真,并与TSMC 0.35μm混合信号工艺下SPICE仿真结果进行比较验证.结果表明,所提出的模型成功地反映了上述因素对电路的重要影响,模型的应用提高了SIMULINK的仿真精度.  相似文献
4.
本文讨论了判定负反馈系统稳定性的两个准则及它们的使用范围。指出多极点负反馈系统不宜采用增益裕量作为判定准则。  相似文献
5.
A small change to the standard current mirror op amp configuration is shown to improve performance, with few, if any, disadvantages. Adding a pair of fixed current sources allows reduced operating-point current in the output stage, while the resulting leveraging effect increases slew rate. For equal total power dissipation, the new configuration improves DC gain and gain-bandwidth (GBW) over conventional current-mirror and folded cascode op amps, as shown by hand analyses and SPICE simulations. Also, because of increased input stage transconductance, the new configuration reduces thermal and flicker noise.  相似文献
6.
This paper presents a system model for the representation of amplifiers that cannot be accurately characterized by a classical two pole transfer function. The effects of higher order poles are modeled by an all-pass function added to the conventional two pole model. The accuracy of the model is demonstrated by comparing the results for a typical CMOS amplifier to those obtained from device level simulations using SPICE. This model can be easily implemented in a standard simulator and is shown to achieve fast simulation time. This model is expected to have application in system level modelling of mixed-signal circuits using conventional SPICE simulators.Yihong Dai received his B.S. and M.Eng. degrees in Electrical Engineering from Shanghai JiaoTong University, Shanghai, China in 1993 and 1996, respectively. From 1996 to 1998, he enjoyed his industrial experiences in Shanghai with semiconductor companies like Shanghai Nortel Semiconductor and Motorola Electronics (China) Shanghai Branch. Since 1998, he has been a research assistant at the Analog and Mixed-signal Laboratory of the Electrical Engineering Department of Brigham Young University working toward his Ph.D. During the summer of 1999, he was with AMI semiconductor Utah Research and Design Center where he developed a threshold voltage based CMOS voltage reference architecture. In the summer of 2001, he was with Ultra Design where he designed a reference amplifier for high speed digital-to-analog converters. His research interest includes voltage reference, reference amplifier and high speed data converters in both CMOS and GaAs processes.Donald T. Comer received the B.S, M.S., and Ph.D. degrees from San Jose State University, the University of California (Berkeley), and the University of Santa Clara, respectively, all in electrical engineering. He began teaching at San Jose State University in 1961 and mixed his teaching and industrial work until he left San Jose State University in 1979. He has worked for California Technical Industries, IBM Corp., Mobility Systems, Precision Monolithics, Storage Technology Corp., and Analog Devices during his career. He founded the AMI Utah Research and Design Center in 1998 that specializes in MOS design. In 2002, Dr. Comer founded Ultra Design, a design center that specializes in high-frequency heterojunction circuit designs. He holds fifteen patents and has published over 50 articles dealing with solid-state and integrated circuits. He has published five textbooks in the field of large-signal and integrated circuits. He formerly held the Quentin Berg Chair at Penn State Harrisburg from 1990 to 1995. He is now a professor of electrical and computer engineering at Brigham Young University where he held the Endowed Chair of Engineering from 1995 to 1998.David J. Comer received the B.S., M.S., and Ph.D. degrees from San Jose State University, the University of California (Berkeley), and Washington State University, respectively, all in electrical engineering. He has worked for IBM Corp., Pacific Electromagnetics, Lawrence Livermore Laboratories, and Intel Corporation. He began his teaching career at the University of Idaho and has taught at the University of Calgary and California State University, Chico. He is presently a professor of electrical and computer engineering at Brigham Young University. He served as Chairman of the Division (Dean) of Engineering at CSU, Chico and as Department Chair at BYU.While at CSU, Chico, Dr. Comer served on the statewide Engineering Liaison Committee and served as Chair of the Council of California State University Deans of Engineering.Dr. Comer has published twelve textbooks and over 60 articles in the field of circuit design. He has contributed sections to the Encyclopedia of Physical Science and Technology and holds seven patents. He was given the Professional Achievement Award at CSU, Chico and was named the Outstanding Teacher of Engineering at BYU. He has also held the College of Engineering Research Chair at Brigham Young University.Darren Korth received the B.S. and M.S. degrees in electrical engineering at Brigham Young University, Provo, Utah in 1999. He is currently pursuing a Ph.D. in electrical engineering. He served as an instructor for the Department of Electrical and Computer Engineering at Brigham Young University from 2000 to 2002. From 2001 to 2003, he also worked as a senior design engineer at UltraDesign, LLC, Provo, Utah where he researched high-speed data converter circuits. He is currently with AMI Semiconductor in their RF CMOS group.  相似文献
7.
结合精确度和稳定性的要求提出了一种适合宽范围电容负载的CMOS运放.在多径嵌套式密勒补偿结构中加入一个抑制电容得到适合各种电容负载的稳定性.为了证实稳定性的提高对该结构进行了理论分析并计算得出数学表达式.基于这种新的频率补偿结构,利用CMOS 0.7μm工艺模型设计了样品芯片.测试结果表明:该运放可以驱动从100pF到100μF负载电容,直流增益为90dB,最小相位裕度为26°;该运放在100pF负载情况下单位增益带宽为1MHz,使用抑制电容仅为18pF.  相似文献
8.
张天柱  魏廷存  吴伟 《微电子学》2007,37(5):752-755
针对TFT-LCD驱动芯片的电荷泵,设计了一个带密勒补偿和一条前馈通路的缓冲电路。理论分析表明,该电路的增益、稳定性等小信号特性与负载电容无关;相位裕度与负载电流无关。Hspice仿真结果显示,当负载电容从0.05μF到20μF变化时,系统的相位裕度变化为2°;当负载电流从3 mA到25 mA变化时,系统的相位裕度变化在3°以内。  相似文献
9.
冉然  邱琪 《现代传输》2007,2(2):66-69
设计了一种CMOS三级跨阻抗前置放大器。通过控制开环系统增益达到增加闭环系统稳定性的目的。仿真结果表明,传输速率为2.5Gb/s时该前置放大器的灵敏度-25.2dBm。动态范围26.2dB.相位裕度在41.1度至89.9度之间变化,稳定性较高。  相似文献
10.
Multistage amplifiers are urgently needed with the advance in technology, due to the fact that single-stage cascode amplifier is no longer suitable in low-voltage designs. Moreover, the short-channel effects of the sub-micro CMOS transistor cause output-impedance degradation and hence the gain of an amplifier is reduced dramatically[1~6]. For multistage amplifiers, most of the compensation methods are based on pole splitting and pushing the right-half-plane zero to high frequencies or pole-ze…  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号