介质隔离高稳定低噪声对管电路的工艺研究

文章采用先进的全介质隔离、高频低噪声、浅结工艺研制高稳定性低噪声对管电路。该器件具有两管电流放大系数对称性好（hFE=97%)、噪声系数低（NF≤3dB）、隔离度高（g≥40dB）、共模抑制比高（CMRR≥80dB)和截止频率高（fT≥600MHz）等优点。     

基于Wishbone和端点IP的PCIE接口设计

介绍了FPGA内嵌的PCIExpress硬核端点模块和Wishbone片上总线规范。应用VHDL语言,编程实现了Wishbone总线的主从端口,以及TLP包的编码和解码功能。在FPGA上运行程序并使用Chipscope测试时序波形,验证了接口数据传输的稳定性和正确性。     

Channel quality-to-interference ratio quantization criterion for limited feedback beamforming in MIMO systems

The discrete Fourier transform (DFT)-based codebook is employed in this paper to quantize channel state information so that the amount of feedback can be reduced in the multiple input multiple output (MIMO) downlink of long term evolution (LTE) system. And a novel beamforming (BF) scheme based on the proposed channel quality-to-interference (QIR) quantizing criteria is developed, which uses only the index of the optimal codebook for the beamforming at the base station (BS), and dramatically reduces the amount of feedback. The proposed BF scheme jointly considers the influences of the quality of the quantized channels and the mutual interference among the sub-channels. The extensive simulation results verify that throughput of the proposed BF scheme is better than that of the random BF with a little feedback, and that of the eigen-beamforming even under low signal noise ratio (SNR) scenario.     

Digital driver for 2-inch LTPS AM-OLED displays

Organiclightemittingdiode(OLED)displayshave beenattractingmoreattentionbecauseoftheirvariousadvantagesincludingsimplestructure,self emitting,fast responsetimeandwideviewingangle.Inthelastdec ade,thefocusofresearchisonimprovementofefficiency andreliability…     

变压器状态检修技术方案的可靠性研究

简要介绍了我国目前大部分变压器的检修方法和状况，从定期检修、延长设备寿命、保证设备安全运行，以及经济性等方面探讨了此种检修方式的弊端，并结合黄埔发电厂历年来变压器大修的实际情况，阐述了变压器状态检修的必要性．对当今变压器状态检修的一些方法及变压器状态检修技术方案也作了初步探讨．     

基于RFID的教室考勤系统设计研究

针对传统的课堂点名方式效率低下及门禁刷卡考勤不能实时掌握到课人数的现状,提出一种基于超高频无源RFID的教室考勤系统：通过RFID标签的惟一标识特性判断持卡人是否出勤;采用基于接收信号强度RSSI的定位算法,计算出持卡人的座位,并通过查重算法排除一人持多卡的现象。实现了对课堂到课情况的实时高效点名和考勤手段的信息化。     

Numerical study of ductile failure morphology in solder joints under fast loading conditions

A numerical study is undertaken to investigate solder joint failure under fast loading conditions. The finite element model assumes a lap-shear testing configuration, where the solder joint is bonded to two copper substrates. A progressive ductile damage model is incorporated into the rate-dependent elastic-viscoplastic response of the tin (Sn)–silver (Ag)–copper (Cu) solder alloy, resulting in the capability of simulating damage evolution leading to eventual failure through crack formation. Attention is devoted to deformation under relative high strain rates (1–100 s⁻¹), mimicking those frequently encountered in drop and impact loading of the solder points. The effects of applied strain rate and loading mode on the overall ductility and failure pattern are specifically investigated. It is found that, under shear loading, the solder joint can actually become more ductile as the applied strain rate increases, which is due to the alteration of the crack path. Failure of the solder is very sensitive to the deformation mode, with a superimposed tension or compression on shear easily changing the crack path and tending to reduce the solder joint ductility.     

Phase-dependence correlated electron momentum distribution from nonsequential double ionization of N2 by few-cycle laser pulses

Using the classical three-dimensional (3D) ensembles, we have investigated nonsequential double ionization (NSDI) of N2 by phase-stabilized few-cycle pulses. We find that the correlated electron momentum distributions in the direction parallel to the laser field strongly depend on the carrier-envelope phase (CEP) of few-cycle pulses, and this phase dependence is not affected by the alignment of the molecular axis relative to the laser field. Back analysis reveals that the ionization rate of the first electron and the recollision energy play a main role in the electron momentum distributions. Our results suggest that the few-cycle pulses with stabilized phase can serve as a powerful tool to investigate the recollision dynamics in NSDI of molecules.     

Least Squares Identification for Hammerstein Multi-input Multi-output Systems Based on the Key-Term Separation Technique

System modeling and parameter estimation are basic for system analysis and controller design. This paper considers the parameter identification problem of a Hammerstein multi-input multi-output (H-MIMO) system. In order to avoid the product terms in the identification model, we derive a pseudo-linear identification model of the H-MIMO system through separating a key term from the output equation of the system and present a hierarchical generalized least squares (LS) algorithm for estimating the parameters of the system. Moreover, we present a new LS algorithm to reduce the computational burden. The proposed algorithms are simple in principle and can achieve a higher computational efficiency than the over-parameterization-based LS estimation algorithm. Finally, we test the proposed algorithms by the simulation example and show their effectiveness.     

激光制导炸弹脱靶量计算方法

通过建立靶心坐标系与测试坐标系之间的转换矩阵，得出激光制导炸弹脱靶量矢量的计算方法；利用约束条件下的最小二乘回归方法得到激光制导炸弹在落点附近弹道诸元的精确估计。解决了激光制导炸弹飞行试验中脱靶量测试与计算的难题。