摘要：coupled inductor is one appealing technology to improve transient response and reduce output decoupling significantly in interleaved multi-phase voltage regulators (VRs). One well known problem is that coupled inductor winding structure causes PCB routing path longer than discrete inductor design. This paper investigates possible PCB routing schemes for coupled inductor and conducts a fair and quantitative comparison with discrete inductor in a server VR design. Simulation and measurement are also conducted to verify the analysis.

摘要：In this paper,we report on the identification and modeling of unknown and higher order processes into first order plus dead time(FOPDT)plants based on the limit cycle information obtained from a single relay feedback test with an online fractional order proportional integral(FOPI)*** parameters of the test processes are accurately determined by the state space method while the FOPI controller settings are re-tuned to achieve enhanced performance based on the identified model parameters based on the balancedtuning method.A new performance index,integral time fractional order absolute error(ITFIAE)is introduced in this paper for balanced tuning of fractional order(FO)*** requires minimum design specifications without a-priori knowledge of gain and phase crossover frequencies and is done non-iteratively without disrupting the closed *** test processes and experimental analysis on a coupled tank system(CTS)validate the theory proposed.

摘要：A new design technique employing CMOS Current Feedback Operational Amplifier (CFOA) is presented. This design approach applies CFA OTA as input stage cascaded with class AB cross-coupled buffer stage. The performance parameters of CMOS CFOA such as bandwidth, slew rate, settling time are extensively improved compared with conventional CFOA. These parameters are very important in high frequency applications that use CMOS CFOA as an active building block such as A/D converters, and active filters. Also the DC input offset voltage and harmonic distortion (HD) are very low values compared with the conventional CMOS CFOA are obtained. P-Spice simulation results using 0.35 μm MI-ETEC CMOS process parameters shows considerable improvement over existing CMOS CFOA simulated model. Some of the performance parameters for example are DC gain of 67.2 dB, open-loop gain bandwidth product of 104 MHz, slew rate (SR+) of +91.3 V/μS, THD of -67 dB and DC input offset voltage of -0.2 mV.

摘要：针对现有栅耦合NMOS(gate coupled NMOS,gcNMOS)静电放电(electrostatic discharge,ESD)保护电路对特定ESD脉冲不能及时响应造成的"触发死区"现象,本文提出了一种全新结构的栅耦合栅接地NMOS(gate coupled gate grounded NMOS,gc-ggNMOS)ESD保护电路,这种结构通过利用保护电路中漏、栅交叠区的寄生电容作为耦合电容,连接保护电路栅与地的多晶硅(poly)电阻作为耦合电阻,在有效解决原有gcNMOS结构"触发死区"现象的同时,还避免了因引入特定耦合电容带来版图面积的增加,进而提高了ESD保护电路鲁棒性指标。本文采用ISE-TCAD仿真软件,建立了0.6μm CSMC6S06DPDM-CT02CMOS工艺下gc-ggNMOS ESD保护电路的3D物理结构模型,并对此种结构中关键性参数耦合电阻、电容与触发电压特性的关系进行了系统仿真。仿真表明,当耦合电容为定值时,保护电路触发电压随耦合电阻阻值的增加而减小,这一结果与流片的传输线脉冲(transmission line pulsing,TLP)测试结果吻合。全新结构的gc-ggNMOS ESD保护电路通过了5KV人体放电模式(human body model,HBM)测试。本文的研究结果为次亚微米MOS ESD保护电路的设计提供了一种新的参考依据。

摘要：选取某MW级风力发电机组为研究对象,设计了机组运动拓扑结构图,构建了风机整机的刚柔耦合多体动力学分析模型,并与气动力计算软件Aero Dyn和控制求解器通过接口力元实现联合仿真。模态分析计算得到了整机前6阶固有频率和模态振型,分析可知机组与关键转速区间激振频率不发生共振。动态仿真计算得到了3种不同工况下风机塔架迎风方向的位移、加速度动响应以及叶片三坐标方向的叶尖挠度,分析发现阵风期间塔架位移突然增大且瞬时波动剧烈;叶片的x方向叶尖挠度值最大,可能使叶片和塔架发生碰撞。

摘要：针对目前传统的乳化液浓度检测方法不能实时检测这一现状,该文提出了基于全反射原理的乳化液浓度实时检测系统设计方法。通过CCD(Charge coupled Device)光学器件、温度补偿电路和单片机控制电路实现对乳化液浓度的实时准确的检测。实践表明,该设计是切实可行的,具有很强的实用性。

摘要：传输管线是一种通用设备,可以用于许多不同的目的——连接2个色谱仪使用安装在两个设备(入口、检测器和其他)上的各种设备。传输管线是制造商的独特创新(自带电子设备),易于设置和维护。GC-GC界面使人们能够创建通用且功能强大的系统,可用于许多GC实验室。