数模混合高速集成电路封装基板协同设计与验证

介绍了数模混合高速集成电路(IC)封装的特性以及该类封装协同设计的一般分析方法.合理有效的基板设计是实现可靠封装的重要保障,基于物理互连设计与电设计协同开展的思路,采用Cadence APD工具以及三维电磁场仿真工具实现了特定数模混合高速集成电路(一款探测器读出电路)的封装设计与仿真论证,芯片封装后组装测试,探测器系统性能良好,封装设计达到预期目标.封装电仿真主要包含:封装信号传输通道S参数提取、电源/地网络评估,探测器读出芯片封装体互连通道设计能满足信号带宽为350 MHz(或者信号上升时间大于1 ns)的高速信号的传输.封装基板布线设计与基板电设计协同分析是提高数模混合高速集成电路封装设计效率的有效途径.     

基于HBP编码结构的MVC快速算法

针对MVC系统中运算量最大的矢量预测部分——单向搜索和双向搜索,该文提出一种快速算法。根据多视点视频的序列相关性,采用立体-运动约束模型在运动域和视差域进行联合迭代单向搜索,设计可信度因子来自适应地调整修正搜索窗口,同步搜索得到运动和视差矢量。此外,通过分析双向预测宏块的特性,提出一种双向搜索提前中止算法。实验结果证明该文算法的有效性,能在保持编码质量的同时极大减少算法复杂度。     

Development of a multi-channel readout ASIC for a fast neutron spectrometer based on GEM-TPC

A multi-channel front-end ASIC has been developed for a fast neutron spectrometer based on Gas Electron Multiplier(GEM)-Time Projection Chamber(TPC). Charge Amplifier and Shaping Amplifier for GEM(CASAGEM) integrates 16+1 channels: 16 channels for anodes and 1 channel for cathode. The gain and the shaping time are adjustable from 2 to 40 mV/fC and from 20 to 80 ns, respectively. The prototype ASIC is fabricated in0.35 μm CMOS process. An evaluation Print Circuit Board(PCB) was also developed for chip tests. In total 20 chips have been tested. The integrated nonlinearity is less than 1%. The equivalent noise electrons is less than 2000 e when the input capacitor is 50 pF. The time jitter is less than 1 ns. The design and the test results are presented in the paper.     

面向独热编码的有限状态机抗单粒子翻转设计

在空间高能粒子影响下,电路容易发生单粒子翻转,而在电路设计中处于核心地位的有限状态机一旦受到单粒子翻转影响,可能无法进行正常的状态转移,从而导致有限状态机失去数据控制功能。为此,面向独热编码的有限状态机进行了抗单粒子翻转设计,并以航空全双工交换以太网中的入队数据总线控制模块作为验证模型,通过故障注入验证了设计方法的正确性。最后对该设计进行了可靠性评估,结果表明相比于传统的三模冗余加固方法,该方法的失效概率降低了两个数量级,此外还能根据实际需求调整纠正位数。相比于编码方式,该方法采用的逻辑更简单,更便于设计人员的开发和使用,具有较强的实用性。     

Limits on light WIMPs with a 1 kg-scale germanium detector at 160 eVee physics threshold at the China Jinping Underground Laboratory

We report results of a search for light weakly interacting massive particle(WIMP) dark matter from the CDEX-1 experiment at the China Jinping Underground Laboratory(CJPL). Constraints on WIMP-nucleon spin-independent(SI) and spin-dependent(SD) couplings are derived with a physics threshold of 160 eVee, from an exposure of 737.1 kg-days. The SI and SD limits extend the lower reach of light WIMPs to 2 GeV and improve over our earlier bounds at WIMP mass less than 6 GeV.     

Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-10 experiment

The China Dark Matter Experiment (CDEX) is located at the China Jinping Underground Laboratory (CJPL) and aims to directly detect the weakly interacting massive particles (WIMP) flux with high sensitivity in the low mass region. Here we present a study of the predicted photon and electron backgrounds including the background contribution of the structure materials of the germanium detector, the passive shielding materials, and the intrinsic radioactivity of the liquid argon that serves as an anti-Compton active shielding detector. A detailed geometry is modeled and the background contribution has been simulated based on the measured radioactivities of all possible components within the GEANT4 program. Then the photon and electron background level in the energy region of interest (<10^-2 events·kg^-1·day^-1·keV^-1 (cpkkd)) is predicted based on Monte Carlo simulations. The simulated result is consistent with the design goal of the CDEX-10 experiment, 0.1cpkkd, which shows that the active and passive shield design of CDEX-10 is effective and feasible.     

家电控制器用红外接收头可靠性测试研究与优化

到目前为止,红外接收头仍是国内外很多家电企业广泛使用的整机接收遥控信号的主要电子元器件,如空调、电视机、机顶盒、遥控电扇等,其接收性能直接影响着用户使用的舒适度和便捷性。本文重点研究和分析了在大型家电企业中如何快速、有效地识别和鉴定红外接收头的主要接收性能。     

融合时序特征和关键帧的视频检索方法

针对已有视频检索方法存在的诸多问题,提出了一种融合视频时序特征和关键帧的视频检索方法.该方法首先提取视频的时序特征,通过匹配两段视频的时序特征可直接实现画面变化率高的视频(如广告等)的检索,大大减小了视频检索的运算量.在此基础上,对于画面内容变化率较低的视频(如电视剧等),进一步将其划分为若干个子片段,每个子片段中提取...