深亚微米ASIC:系统设计不可或缺的技术

要想充分利用深亚微米ASIC的全部速度和复杂性,就需要知道IC物理性质是如何变化的,并要知道如何去选择能使你达到深亚微米ASIC功能的设计工具。     

成品率驱动的光刻校正技术

光刻校正技术已成为超深亚微米下集成电路设计和制光刻校正技术的基本原理以及在IC设计中使用这些技术需要注意的问题,为可制造性设计提供有价值的指导.     

数字IC端口的设计

本文讨论了IC进入深亚微米(DSM)阶段后，数字IC端口的设计所面对的困难。主要介绍了ESD保护、驱动电路设计以及端口设计的SPICE模型仿真验证。     

台湾IC工业的发展和现状

台湾的IC工业从7μm开始经过20年的发展，进入了深亚微米技术水平。从生产到研究进入世界IC列强第4位。本文介绍了台湾IC的发展优势、工业状况以及科技工业园的建设。     

片上系统时代呼唤新设计方法

越来越多的复杂IC是用深亚微米技术的片上系统(SOC)技术制造的。事实上，SOC是利用深亚微米技术的唯一有效途径(也是半导体厂商收回建厂投资的唯一有效途径)。虽然如此，还是有一些问题应当考虑：     

采取前端和后端协作方案的IC设计

今天,IC设计的成功与否在很大程度上取决于其设计过程是否顺利。在这个深亚微米时代,前端和后端设计领域更加密切的结合对于先进IC的高效开发是非常关键的。不幸的是,诸如专业化和小组分工等行为将本需要统一的设计过程割裂开来。     

两相邻耦合RC互连的串扰效应及其抑制

随着微电子技术的进步,集成电路的特征尺寸逐步缩小,IC设计已经向着深亚微米甚至超深亚微米设计发展,一系列由于互连线引起的信号完整性问题需要设计者更多的考虑,互连线串扰已经成为影响IC设计成功与否的一个重要因素。针对串扰这一问题本文讨论了串扰对于电路的影响,分析了深亚微米集成电路设计中对两相邻耦合RC互连串扰的成因,介绍了互连线R,C参数的提取。以反相器驱动源和容性负载为例,建立了两相邻等长平行互连线的10阶互连模型,并且针对该模型,利用Cadence软件进行仿真,分析了引起串扰的因素。在此基础上,最后给出了有效抑制串扰的方法。     

Altera的Quartus Ⅱ 4．2进一步提升FPGA和CPLD性能

在亚微米工艺水平阶段，动态功耗占IC总功耗的比重较大，但随着工艺尺寸不断减小，深亚微米制造工艺正在逐步成熟并被广泛采用，这使得静态功耗，特别是待机功耗在IC总功耗中的比例逐渐增大，同时漏电流也在随之增大。这就需要在提升IC的工作速度和降低功耗之间进行权衡。     

SOC是新世纪IC设计的主流

新世纪伊始,以网络通讯、多媒体技术、移动通讯,软件和微电子为主要发展标志的信息产业呈现快速发展态势,而IC设计技术的前进步代,相对滞后于IC制造技术的发展,设计效率与加工能力的差距越来越大,已经成为制约IC产业发展的关键。以软、硬件协同设计,具有知识产权的内核复用和超深亚微米技术为支撑的系统级芯片(SOC),就成为追赶IC生产制造技术的最佳解决方案。     

IP核的近期发展

在集成电路制作工艺进入深亚微米之后,IC设计能力滞后于工艺水平日甚,势必要提出新的设计思想和设计方法。SOC(System On a Chip)为缓解设计滞后问题提供了一个有效途径,受到了普遍地重视和认可。作为SOC技术的关键,可复用的IP核(Intellectual Property)不仅得到已有的一些EDA公司和IC公司的重     

可控硅整流系统直流侧传导干扰的研究

本文针对三相可控硅整流系统建立了EMC模型,提出了用π型RLC等效网络的级联来表示直流电缆寄主参数的EMC模型,构建了实验系统,对系统的直流侧传导干扰进行了测量,并采用Simulink工具对系统进行了时域传导干扰分析,分析结果与实验吻合,揭示出主要传导干扰出现在低频段,在0-15khz频段中,随频率增加,传导干扰减小,其中共模传导干扰占主要成分,电缆寄生参数对其影响主要是在高频段,它使100KHZ以上频段的传导干扰大约减小20dBμV,本文的工作为今后进一步研究更高频段的传导干扰打下基础。     

数字有源EMI滤波系统延迟的建模与分析

随着数字处理技术的进步,数据采集速度与精度的大幅提高,使得数字有源电磁干扰滤波技术DAEF(Digital Active EMI Filter)成为EMI(Electro-Magnetic Interference)滤波技术发展的新方向.由于EMI信号频率较高,所以EMI滤波控制中的延迟对滤波性能的影响不可忽视,需要深入研究.本文详细分析了数字有源EMI滤波系统中产生延迟的原因,建立了具有延迟特性的数字有源EMI滤波系统模型,仿真分析了延迟时间对EMI滤波系统滤波性能的影响.搭建了基于FPGA(Field Programmable Gate Array)的数字有源EMI控制系统平台,验证了具有延迟特性的数字有源EMI滤波系统模型的正确性,揭示了数字有源EMI滤波系统延迟环节对滤波性能的影响规律,这有助于对数字有源EMI滤波器的进一步研究和推广应用.     

基于新能源利用的逆变系统电磁干扰噪声解决方案

文章在对线性阻抗稳定网络内部结构和测量原理分析的基础上,针对于新能源系统的传导电磁干扰问题提出一种新的测量方法。利用该方法可以较为精确的测量新能源系统中逆变系统的传导电磁干扰噪声,并设计相应的滤波器对于传导电磁干扰噪声进行抑制。并且,根据新能源的特点,提出在直流侧加入电感电容以稳定由于直流侧电能不稳定所带来的电磁干扰噪声问题。实验结果表明该方法较为有效。     

Spread spectrum clock Generator with delay cell array to reduce electromagnetic interference

In high-speed digital systems, most of the electromagnetic interference (EMI) from the system is caused by high-speed digital clock drivers and synchronized circuits. To reduce the EMI from the system clocks, spread spectrum clock (SSC) techniques that modulate the system clock frequency have been proposed. A conventional SSC generator (SSCG) has been implemented with a phase locked loop (PLL) by controlling a period jitter. However, the conventional SSCG with PLL becomes more difficult to implement at higher clock frequencies, in the gigahertz range, because of the random period jitter of the PLL. Furthermore, the attenuation of EMI is decreased due to the random period jitter of the PLL. To overcome the problems associated with the random period jitter, we propose an SSCG with a delay cell array (DCA), which controls the position of clock transitions with a triangular modulation profile. Measurement and simulation have demonstrated that the proposed SSCG with DCA is easier to implement and more effective in attenuating the EMI compared with the conventional SSCG with PLL. The proposed SSCG with DCA was implemented on a chip using a 0.35-/spl mu/m CMOS process and achieved a 9-dB attenuation of the EMI at 390 MHz.     

通信系统电磁兼容技术探讨

随着通信技术的发展,电子产品的功能越来越强大,线路也越来越复杂,对通信装备的质量要求也越来越高．电磁干扰（EMI）和电磁兼容（EMC）问题也越来越突出。探讨丁在通信系统的电路设计中。如何降低EMI,提高系统EMC能力的技术问题。     

A low-noise multiresolution high-dynamic ultra-broad-band time-domain EMI measurement system

A time-domain electromagnetic interference (EMI) measurement system allows to reduce measurement time by several orders of magnitude in comparison with conventional systems. This will considerably reduce the costs of compliance tests. In this paper, a novel multiresolution time-domain EMI measurement system is presented. The multiresolution time-domain EMI measurement system exhibits several channels with limiters, amplifiers, and analog-to-digital converters. The amplitude range of the signal is subdivided into several intervals. In each interval the analog-to-digital conversion is performed with an amplitude discretization proportional to the width of the amplitude interval. The signal-to-noise ratio of the multiresolution time-domain EMI measurement system compared with a conventional time-domain measurement system for transient signals is enhanced by at least 50 dB. It is shown that the multiresolution time-domain EMI measurement system has a higher overload factor than conventional systems working frequency domain. The noise floor is 5 dB lower than the noise floor of a conventional EMI receiver. The multiresolution time-domain EMI measurement system shows a higher 1-dB compression point than conventional EMI receivers. Measurements were performed in the frequency range from 30 MHz to 1 GHz and compared with results obtained by an EMI receiver.     

Electromagnetic interference on medical equipment by low-powermobile telecommunication systems

There have been a number of reports of electromagnetic interference (EMI) on electronic medical equipment caused by mobile telecommunication systems. In Japan, the use of the personal handy-phone system (PHS) has greatly expanded within urban areas, PHS handsets transmit EM signals at a frequency of 1.9 GHz and have a peak radiated power of 80 mW. This power level is lower than that of other mobile telecommunication systems. Two studies were carried out. One was to determine whether or not PHS interferes with electronic medical equipment in hospitals. We observed no EMI on electronic medical equipment when the PHS handset was in either the speaking mode or on standby. The second study was to observe EMI from 1.9-GHz signals at several radiation power levels. Although EMI was not observed at the radiated peak power of the PHS handset, EMI on some of the tested equipment was observed when the radiated power was ten or more times higher than that of the PHS handset     

减少电磁炉EMI的一种简单有效的方法

随着科学技术的发展,家庭使用的电子、电气设备愈来愈多,导致电磁环境日益恶化。电磁炉作为其中一个重要的辐射源,引起人们越来越多的关注。干扰滤波是一项重要的电磁兼容技术,实际中应用最广泛的一类滤波器是电源线滤波器。电磁炉相当于开关电源,在对电源线滤波器进行研究改进的基础上,通过实验论证,提出了一种减少电磁炉EMI的简单有效的办法。此方法不仅能简单有效地改善电磁炉的电磁干扰现象,而且还能有效地改善其他干扰较为严重的家用电子、电器设备,具有广泛的适用性。     

EMI滤波器的PSpice辅助设计

提出了一种使用PSpice仿真软件设计EMI滤波器的方法。首先给出了EMI滤波器设计的一般步骤;然后结合具体实例设计出一款二阶EMI滤波器,并将加入滤波器前后的输入电流波形进行对比。结果表明：采用PSpice设计的滤波器使输入电流的纹波系数降低,符合设计要求;同时还具有抑制浪涌电流和防止系统振荡的能力。     

Field-Line-Circuit Coupling Based Method for Predicting Radiated Electromagnetic Emission of IGBT-PMSM Drive System

Electric drive system with Insulated gate bipolar transistor (IGBT) power device is widely used in Electric vehicle (EV), which consists of inverter, cables and Permanent magnet synchronous motor (PMSM). Due to the fast switching in di/dt and dv/dt of IGBT device, the system produces serious radiated Electromagnetic interference (EMI) through the interconnection cables. Thus, modeling of EMI source, propagation path and load PMSM is the key to accurately evaluate the system's radiation level. In addition, the system's radiated EMI involves the integrated calculation of circuit, cable and electromagnetic field, which cannot be solved by using a single circuit or electromagnetic calculation method. Therefore, this paper develops an effective field-linecircuit coupling based method to investigate the radiated EMI problems for IGBT-PMSM drive system, which is validated by experimental measurement. Besides, the impact of power cable parameters on radiated EMI is discussed. The proposed approach has guiding significance for electromagnetic compatibility design of EV.