专用单片机SH58216与PC机串行通信底层程序设计

文中介绍8位专用单片机SH58216的异步串行接口(UART)在电子辞典系统开发中的实际应用。系统地阐述单片机异步串行接口(UART)与PC机RS232串口通信的软／硬件设计原理与方法。     

Emerging SiGe HBT reliability issues for mixed-signal circuit applications

We review the emerging reliability issues associated with high-performance SiGe HBT technologies which are being increasingly deployed in a wide variety of mixed-signal circuit applications. For the purposes of this work, we define the concept of device "reliability" to be broader than its standard usage in the industry, to include all possible transistor degradation mechanisms, for all possible mixed-signal circuit designs, in any of the various intended mixed-signal applications. For instance, in addition to classical device reliability mechanisms associated with reverse emitter-base and high forward current density stress, new reliability issues for SiGe HBTs, including impact-ionization induced "mixed-mode" stress, scaling-induced breakdown voltage compression and operating point instabilities, geometrical scaling-induced low-frequency noise variations, and the impact of ionizing radiation on device and circuit reliability, are also addressed.     

三轴电容式微加速度计接口ASIC设计

基于CSMC0.5um CMOS工艺,给出了一款3轴电容式微加速度计接口ASIC的详细设计方案。利用时分复用技术实现了使用同一电路模块同时检测3个轴向的加速度信号,利用相关双倍采样技术提高了电容电压转换的分辨率,利用Sigma_Delta调制技术对电路噪声进行有效整形。仿真得到系统的分辨率为0.91 a F/Hz1/2,3个轴向的噪声密度分别为43.60μg/Hz1/2、43.60μg/Hz1/2和45.70μg/Hz1/2,3个轴向输出数字脉冲信号占空比的非线性度分别为1.38%、0.91%和1.79%。     

一种高可靠性可编程低通滤波器的设计与应用

本文在综合考虑了传感器特性、信号传输和现场应用等因素的基础上,设计了一种高可靠性可编程低通滤波器.与传统的信号滤波器相比,具有带宽可编程选择、放大倍数可灵活调整、可靠性高等优点.通过实验测试及其工程应用,验证了该滤波器操作的方便性、可靠性和良好的滤波效果,很好地满足了测量要求.     

现代电子系统设计方法与ASIC

介绍现代电子系统的设计思想并指出：专用集成电路(ASIC)的出现使传统的电子设计方法逐步退出,形成了“自顶向下”的设计思想。讨论了ASIC的特点,由于可编程的ASIC具有可编程性和设计的方便性,被广泛地应用。目前,ASIC正朝着高密度、大规模、重构性等方向发展。     

步进电动机细分控制专用集成电路的设计

文章介绍了两相双极步进电动机细分控制专用集成电路CA6026的设计,着重论述了CA6026中采用的改进的恒流斩波法、可调衰减模式等控制技术,并用基于CA6026的步进电动机控制器样机进行了验证、评测。     

图象数据采集系统及其ASIC设计

本文主要介绍图象数据采集卡，特别是其中的ASIC（专用集成电路）设计。专用集成电路是一片4200门的FPGA芯片，通过对内部电路的设计用以完成512×512×8位的二维数据采集。这种电路与系统的设计简化了印制板，实时性和可靠性都得以提高。方案还具有可扩充性和可移植性。     

高速数字PID控制器的ASIC设计

在传统数字ＰＩＤ控制器中，计算占据了大量的时间。因此，在很多场合需要一种运算速度很高而同时又具有高性能价格比的硬件实现形式。本文首先给出了一种实现有符号数相乘的并行定点乘法器设计方案，在此基础上提出了高速数字ＰＩＤ控制器的ＡＳＩＣ设计方案，随后介绍了控制器的版图设计以及逻辑模拟，结果证明设计是成功的。     

Bulk power system reliability concepts and applications

While it is pointed out that probabilistic methods for the reliability assessment of composite generation and bulk transmission in electric power systems are still under development, an overview is given of the purposes and uses of power systems reliability studies. Probabilistic indices and reliability criteria are discussed. The features of a comprehensive reliability program to compute these indices are listed, and of these features, those required in selected applications are examined. Modeling and computational difficulties are discussed, and the necessity of balancing program accuracy and computing effort is stressed     

非晶态合金催化剂在低温燃料电池中的应用

介绍了非晶态合金作为催化剂在低温燃料电池中应用的情况。由于受工作环境的限制,低温燃料电池对催化剂的要求比较高。从非晶态合金的结构特点出发,分析了其能够作为潜在的高效、长寿命催化剂应用在低温燃料电池中的原因。根据已有的文献,总结了几种低温燃料电池用非晶态合金催化剂的制备方法,并简单介绍了文献中已有的一些非晶态合金在燃料电池中的应用。     

全定制专用电路门级电流评价方法

文章叙述全定制专用电路设计过程中动态电流的建模及评估方法。这一工作是基于已开发的原理图逻辑仿真器及布局图性能模拟器工具在底层进行的。电流模型库的建立为设计人员进一步分析动态功耗,计算电磁兼容指标等提供了依据。通过样本动态电流从时域到频域的转换,与实际测量给出的频谱分析曲线对比,其结果是满意的。     

基于专用ASIC的引信动态参数存储测试系统设计

针对某引信在膛内工作时出现的问题,设计一种小型的能够承受膛内发射和撞地时高冲击过载的存储测试装置,并对其进行测量.这套独立的弹载存储测试装置采用自主开发的弹载测试专用ASIC-HB0202,具有微体积、微功耗和可靠性高的特点.本测试系统安装在体积很小的引信腔内,不需要对弹丸进行改装,在一次实验过程中能够完成对引信在膛内整个运动过程的三轴加速度、转速等多路参数的测量,并已成功测得多组数据,是引信故障分析和改进设计的重要手段.     

A generalized continuous distribution approach for generatingcapacity reliability evaluation and its applications

A generalized approach to the use of continuous distribution approximation for generating capacity reliability evaluation is presented. The well-known Gram-Charlier's expression is a special case of this general formulation. Using this formulation, any continuous distribution function can be examined for its suitability for modeling generation systems. The results obtained by using two- and three-parameter gamma distribution functions with this approach are compared with those from the normal model or the Gram-Charlier expansion     

Lifetime prediction and design of reliability tests for high-power devices in automotive applications

Different procedures are defined and compared to extract the statistical distribution of the thermal cycles experienced by power devices that are installed in hybrid vehicles and operated according to arbitrary mission profiles. This enables both to design efficient accelerated tests tailored on realistic data and to provide the input for lifetime prediction models. Initially, the system lifetime is predicted under the assumption of linear accumulation of the damage produced by low cycling fatigue. Also, a novel prediction model based on some fundamental equations is introduced which takes into consideration the creep experienced by compliant materials when they are submitted to thermal cycles.     

A hierarchical view on modeling the reliability of a DSRC link for ETC applications

For electronic payments, the communication link has to be reliable. Dedicated short-range communication (DSRC) is a proposed solution for the automatic debiting of vehicles in an electronic toll collection (ETC) system without disturbing the traffic flow. The requirements on the reliability of such a system are high, which implies that only large-scale simulations with a lot of detail are effective for analyzing occasional errors. In this paper, a hierarchical approach is worked out that allows such simulations of the communication link, with a 80% reduction of the computational effort compared to simulation with full detail.     

Bluetooth ASIC接口技术

介绍Bluetoooth ASIC芯片开发情况以及由两芯片组（或单芯片组）构成Bluetooth模块的方法，并通过Bluetooth模块与主机设备之间的HCI接口设计，来形成Bluetooth设备。     

电力线载波DSSS的ASIC研究与设计

电力线载波通信的特点采用扩展频谱通信方式,系统具有较强的抗干扰特性。通过FPGA运用ASIC的设计方法,对扩频通信的原理和实现过程都进行了论述,同时对于数字电表的SOC具有一定的意义。最后,利用已有的集中器产品,验证了系统原理。     

一种低温锂离子电池组设计及失效分析

介绍了一种低温锂离子电池组的设计方案,通过不同温度下的试验验证了方案的合理性。对该型低温锂离子电池组在应用中的一次典型失效问题进行了机理分析,并提出了解决措施,低温型锂离子电池组的使用维护要求应该与环境温度相关联。     

Design of a concept and a wireless ASIC sensor for locating Earth faults in unearthed electrical distribution networks

In this paper, a new concept for using simple wireless sensors for detecting and locating faults in an unearthed electrical distribution network is presented. The concept is based on distributed wireless sensors that are attached to the incoming and outgoing power lines of different feeders and branches. A sensor measures only the phase current characteristics of the wire it is attached to, is not synchronized to other sensors, and does not need configuration of triggering levels. The main novelty of the concept is in detecting and locating faults by using the electrical distribution system aspects and the Bayesian probability theory. The feasibility and selectivity of the concept is shown with several simulations done with the Matlab SimPowerSystems environment. In addition, a new design of a wireless application-specific integrated circuit sensor for the proposed fault-management concept is presented.