单方向分离式母板互联设计技术

针对电路模块的功能扩展带来的模块对外接口不足的问题,通过对分离式母板互联技术研究,确定了结构上分离的母板互联形式,主要对单方向分离互联母板互联设计、结构设计、印制板设计、可靠性设计等设计技术展开探讨,从一个角度解决了传统母板限制电路模块功能扩展带来的互联问题,实现了电路模块功能的有效扩展。     

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.     

基于分段线性正电阻的蔡氏电路设计

为了简化蔡氏二极管的设计,提出了一种分段线性正电阻的设计方法。将设计的分段线性正电阻转换成分段线性负电阻,该分段线性负电阻用于设计新的蔡氏电路,通过EWB仿真和硬件电路测试表明新的蔡氏电路能有效地产生混沌行为。无论是从产生的混沌行为还是从电路的结构来看,均具有现有蔡氏电路所不具备的一些优点,结果表明电路设计是有效的。     

The Effect of Gradual Fluorination on the Properties of FnZnPc Thin Films and FnZnPc/C60 Bilayer Photovoltaic Cells

Motivated by the possibility of modifying energy levels of a molecule without substantially changing its band gap, the impact of gradual fluorination on the optical and structural properties of zinc phthalocyanine (F_nZnPc) thin films and the electronic characteristics of F_nZnPc/C₆₀ (n = 0, 4, 8, 16) bilayer cells is investigated. UV–vis measurements reveal similar Q‐ and B‐band absorption of F_nZnPc thin films with n = 0, 4, 8, whereas for F₁₆ZnPc a different absorption pattern is detected. A correlation between structure and electronic transport is deduced. For F₄ZnPc/C₆₀ cells, the enhanced long range order supports fill factors of 55% and an increase of the short circuit current density by 18%, compared to ZnPc/C₆₀. As a parameter being sensitive to the organic/organic interface energetics, the open circuit voltage is analyzed. An enhancement of this quantity by 27% and 50% is detected for F₄ZnPc‐ and F₈ZnPc‐based devices, respectively, and is attributed to an increase of the quasi‐Fermi level splitting at the donor/acceptor interface. In contrast, for F₁₆ZnPc/C₆₀ a decrease of the open circuit voltage is observed. Complementary photoelectron spectroscopy, external quantum efficiency, and photoluminescence measurements reveal a different working principle, which is ascribed to the particular energy level alignment at the interface of the photoactive materials.     

平面切换对信号传输特性影响的一种分析方法

采用"场"、"路"结合的方法研究了多层印制电路板参考平面的切换对信号完整性的影响.分析了过孔转换结构中返回电流的路径,通过"场"的方法获得两参考平面间的瞬态阻抗.将过孔转换结构等效为二端口网络,推导了基于等效电路拓扑结构的S参数与节点电压的关系,获得S参数的计算公式.计算了5 GHz内不同的过孔半径和参考面间距的回波损耗与插入损耗.结果表明:返回电流所受到的阻抗随参考平面间距的减小.而减小信号过孔的半径越小,回波损耗就越小,插入损耗越大,过孔转换结构对信号完整性的影响也越小.计算结果与全波有限元电磁仿真的结果基本吻合.     

Effect of lithium intercalation on the photovoltaic performances of photovoltachromic cells

In the last few years, a new class of smart multifunctional photoelectrochemical devices has been attracting the interest of several academic institutions and industrial companies: photovoltachromic cells, combining the features of photoelectrochromic cells with those of dye‐sensitized solar cells. Here, we report the results of a detailed electrochemical analysis aiming at investigating the electrochemical behavior of these complex photoelectrochemical devices. In particular, we have been focused on the effect of Li⁺ ions displacement during the coloration of the electrochromic tungsten oxide on the performances of the photovoltaic unit. As we had previously observed striking differences between the performances of the barely photovoltaic mode (with the tungsten oxide in the bleached state) and the photovoltachromic mode (with the tungsten oxide in the colored state), we thus attempted to provide a reasonable physical interpretation to the observed phenomena. Copyright © 2013 John Wiley & Sons, Ltd.     

控制系统设计与分析中的潜通路分析技术

介绍了潜通路分析的有关概念和技术,着重讨论了计算机辅助潜通路分析的关键技术,包括网络树拓扑模式识别及线索表制作、定性仿真及基于人工智能的自动缺陷分析技术,最后简要介绍了潜通路分析技术在航空航天控制系统设计与分析中的应用。     

基于ADSP-BF533的音频处理系统设计

进行数字信号处理运算的微处理器用于实时快速地实现数字信号处理算法。针对ADSP-BF533的特点介绍了基于该芯片的音频处理系统电路设计,主要包括复位电路、电源单元、存储器单元及模数/数模转换单元等,可作为音频信号处理的通用系统。     

帧同步电路的设计和分析

简要介绍了实现帧同步的几种方法,给出了采用置位同步法的帧同步电路的设计方案,对其状态的转变进行了阐述,并对帧同步电路参数的选择进行了分析。     

压控器件的磁隔离驱动电路设计

根据压控器件的特点,设计出了适用于任意占空比的磁隔离驱动电路。通过仿真,进一步得到最优化的实际驱动电路,最后给出了实验波形。