基于弹载存储系统的便携式读数盒设计及应用

当发射试验结束后,为了对飞行体数据存储器中的数据进行回收,提出了基于FPGA的便携式读数盒的电路设计及控制逻辑设计。在简要介绍数据存储系统的同时,详细阐述了读数盒在弹载存储器数据回收模式中的应用、读数盒的硬件设计以及FPGA的控制逻辑设计。实践证明,该设计实现了飞行体对硬回收存储器中数据的可靠读取和回收,满足工程实践要求。     

潜艇电力推进系统SSM矢量控制策略研究

根据潜艇电力推进系统中六相同步电机（SSM）静止坐标系下的数学模型,针对其数学模型是一个多变量、非线性、强耦合的系统,利用矢量坐标变换,建立了更易于分析的旋转坐标系下的SSM数学模型。通过基于气隙磁场定向矢量控制的研究,保证气隙磁链恒定,就实现了SSM的磁通和转矩分别独立控制,仿真结果验证了模型的正确性和有效性,解决了多相电机的非线性和耦合性。     

地面数字电视系统中内交织器的FPGA实现

在地面数字电视系统中，广播信道存在着突发噪声干扰和随机噪声干扰，而且前者的危害甚于后者。交织就是把集中的突发噪声引起的差错，按一定规律均匀分散给各码字，提高总体差错控制能力。该文介绍了DVB—T地面数字电视系统中内交织的原理和算法，并在此基础上，利用FPGA器件实现内交织器中的比特交织和符号交织。提出了一种新的数字信号测试方法-SignalTap。最后，经过仿真和硬件测试，得到预期的设计结果。     

基于查表原理的单对磁极编码器研制

与光电编码器相比,磁性编码器结构简单、易微型化、且不受尘埃及结雾的影响,但其分辨率和精度较低且难以提高,严重制约了其应用和发展。针对单对磁极编码器,深入分析了传统处理方式上存在的缺陷,提出一种基于标定查表的信号处理方式。采用六路霍尔传感器均布在圆周上,把变化的磁场转换成电压信号,经差分得到查表用三相电压信号。在离线状态下,用高精度光电编码器对电压信号与电机旋转角度进行标定,并把角度数据存储在EEPROM中。工作过程中采用三相电压信号分区间查表得到电机旋转角度值,用FPGA(programmablegatearrayField)进行信号处理,实现了分辨率15位,精度14位(16384线)的角度输出,能够满足电机恶劣环境下高精度位置检测的要求。     

Model plasma dispersion functions for SO phonon scattering in Monte Carlo simulations of high-κ dielectric MOSFETS

We have developed an accurate Padé approximant for the plasma dispersion function that is valid for degenerate semiconductors that occur in ultra-small MOSFETs. The new approximant is based on a two pole model that enables a simple evaluation of the Lindhard dielectric function for the full dynamic response of electrons of any degeneracy. The importance of this result is that it enables a fast numerical algorithm for determining the energies and scattering strengths of coupled plasmon-phonon modes in silicon MOSFET devices with high-κ gate stacks. Moreover, the formalism allows the systematic inclusion of Landau damping and other processes such as collisional damping that damp out some of the modes at particular ranges of wave vector. The new model is a non-trivially scaled model of a previous approximant derived for Boltzmann statistics. The new model reduces to the classical result in the appropriate limit. Results are presented that compare the exact numerically computed complex plasma dispersion function with the new Padé approximant model. Comparison is also made between exact numerical calculations and the Padé approximant model for static screening. A brief outline is made of the potential application to high-κ gate stack devices where the formalism should provide a significantly large reduction in complexity that will enable efficient Monte Carlo simulation of SO phonon and plasmon scattering.     

Development of a Reconfigurable Platform for Manufacturing Equipment Control

In modern manufacturing equipment control area,controller is required to deliver higher computing capability for adopting advanced algorithms to meet speed and accuracy requirements,and reconfigurabilities for changing or(and)adding features or functions.This paper presents a methodology in design and implementation of a high performance and reconfigurable platform for manufacturing equipment control.This methodology is in virtue of system on a programmable chip(SoPC)technolo- gy but replacing the on-chip processor by an external high performance,floating-point digital signal processor(DSP).The appli- cation of the DSP is designed as a multi-threaded framework,which has more flexibilities than a traditional single-loop one.Fur- thermore,the field programmable gate array(FPGA)system can be reconfigured easily and quickly to meet a new requirement by dragging and dropping pre-built components in a SoPC building environment.As a result,the controller platform is more recon- figurable in terms of algorithms and functions.This platform is implemented in a 3-axis milling machine control and the result indicates that the design and implementation presented in this paper is feasible.     

10kV真空断路器真空度的判定与分析

简单介绍了真空的绝缘特性、真空中电弧的形成与熄灭及真空断路器的工作原理,并对真空度的测试方法进行了较为详细的介绍。     

采用或非门设计最简逻辑电路的方法

给出了采用或非门、利用卡诺图设计最简逻辑电路的方法，并用实例论证这个方法是最简捷的方法，同时也具有一般性。在以CMOS为开关器件的数字集成电路芯片的设计中，由于或非门优于与非门，故应该使用所介绍的方法，直接采用或非门设计组合逻辑电路芯片。     

基于FPGA的医用超声内窥镜成像系统的同步控制

介绍了医用超声内窥镜成像系统的工作原理及超声成像驱动控制系统的设计与实现.根据超声成像系统指标,主要讨论了超声波激发、接收电路原理及具体的电路;现场可编程逻辑阵列(FPGA)作为核心控制模块完成对数据传输和相关电路及芯片的控制,主要实现了对超声波的发射、接收、A/D转换以及成像部分同步控制,电路的性能已得到实验的验证.     

Numerical Explanation of Slow Transients in an AlGaN/GaN HEMT

观察了AlGaN/GaN HEMT器件在短期应力后不同栅偏置下的一组漏极电流瞬态,发现瞬态的时间常数随栅偏压变化很小,据此判断这组瞬态由电子陷阱的释放引起.为了验证这个判断,采用数值仿真手段计算了上述瞬态.分别考虑了在器件中不同空间位置的电子陷阱,分析了应力和瞬态中相应的陷阱行为,对比和解释了仿真曲线与测量结果的异同.基于上述讨论,提出测量的瞬态可能是表面深陷阱和GaN层体陷阱的综合作用的结果.