红外探测器／CCD耦合技术

本文讨论应用于镶嵌焦平面列阵(FPA)的探测器/CCD 耦合技术。给出了大量最佳的耦合连接电路,简单介绍了耦合连接功能如:信号注入、阻抗匹配、信号调节、背景抑制、缓冲及前放等电路。     

基于DSP FPGA GPP-CPU的软件无线电信号处理平台的硬件设计

DSP FPGA构成的数字硬件系统以其强通用性、灵活性、高处理速度而使其在诸多领域有广泛的应用;GPP(General Purpose Processor)功能强大,不仅可以做复杂的控制算法,还具有强大的数字信号处理能力。本文介绍了一种基于DSP FPGA GPP-CPU的软件无线电信号处理通用硬件平台的设计。     

基于现场可编程模拟阵列的音频测量滤波器的设计及实现

采用新型的开关电容现场可编程模拟阵列FPAA，完成音频测量滤波器的设计、时域仿真和SPICE频域仿真。以设计、仿真实现高性能的20kHz低通滤波器为例，最后下载到一片FPAA芯片中实现。     

Designing efficient FPGA tiles for power-constrained ultra-low-power applications

High power consumption of Field-Programmable Gate Arrays (FPGAs) makes them a less attractive choice for ultra-low-power applications. Depending on the power source, ultra-low-power systems could either be constrained by power (energy harvesting systems) or by energy (battery-powered systems). In this work, we are evaluating four different FPGA tiles to find the one that is better suited for both power-constrained and energy-constrained systems. Ultra-low-power systems apply voltage downscaling to reduce the power consumption. However, the operational limits of different blocks do not allow conventional FPGA to be operated at very low voltage. Therefore, their logic capacity can only be increased by 2–4 times by applying voltage downscaling. In this work, we identified the blocks in FPGA tiles that are vulnerable at low voltage and replace them with alternate circuits. The results indicate that, by slight modifications in the conventional FPGA tiles, logic capacity can be increased up to 8 times, whereas power-delay-product can be reduced up to 74%.     

Synthesis of Eu2O3 nanowire arrays through a facile sol–gel template approach

Eu₂O₃ nanowire arrays embedded in anodic alumina membranes (AAMs) were fabricated by an improved sol–gel method. They have cubic structures with uniform diameter of about 40 nm. The emission spectra of Eu₂O₃ consist of one main line at 613 nm under 377 nm excitation, which shows the electric dipole transition ⁵D₄→⁷F₅ (at 613 nm) is the strongest.     

对氨基苯甲酸在不同基底上的SERS研究

用氢气还原氧化银的方法合成了粒径约为100nm的银纳米粒子,然后在表面经PVP修饰的载玻片上以自组装的方式构筑了银纳米粒子单层和双层二维有序阵列,在铝基底上通过对氨基苯甲酸成功构筑了银纳米粒子的有序组装体,用扫描电镜进行了表征;对不同基底二维有序阵列的表面增强拉曼光谱进行了研究,结果表明,对氨基苯甲酸在银和铝基基底上都是垂直吸附,其表面拉曼增强效应是电磁场增强占主导地位,但同时也有化学增强的贡献。     

基于DSP的自适应高分辨DOA估计技术研究

利用自适应波束形成器可以实现DOA估计,本文提出一种改进的自适应高分辨波束形成器,可以提供更加尖锐的方向图,从而进一步提高分辨率,减少误判。最后给出了这一技术基于TMS320C6701DSP的实现方法,通过实验证明了该方法的有效性。