矩阵在数字逻辑设计中的应用

通过两个实例,介绍了矩阵运算在数字电路设计中的应用.根据文中所述的方法,可以快速准确地求出数字通信中常用的循环纠错码及扰码器的并行算法及逻辑表达,并为其它类似数字信号编码问题的电路实现提出了新的解决思路.     

Assessment of digital integrated circuit electromagnetic emissionbased on radiated power evaluation

This paper deals with the assessment of digital integrated circuit (IC) electromagnetic emission (EME), and concentrates on the specific aspect of EME of long external wiring, driven by IC input-output pins. In particular, the contribution of single IC pins is investigated by analyzing the structure composed of an IC output driver connected via a microstrip line to a receiver. A transmission-line model is used, and an approach based on the concept of radiated power is applied to the characterization of single-pin IC EME in terms of external-wiring radiation effects. By the analysis of typical driver-wiring configurations, it is shown that the spectrum of the driver output current is the quantity of interest, and that the use of wiring with smaller characteristic impedance leads to larger radiated power. The use of a specific test setup (IEC 61967-4-150-Ω direct coupling method) for the experimental assessment of single pin IC emissions is also considered. Frequency-dependent setup effects are experimentally ascertained via a scattering parameter characterization, and definition of suitable circuit functions. An estimate of the degree of correlation between voltage measurements foreseen by the test procedure and the total power radiated by the loading network of an IC driver is derived     

OBE理念下“数字集成电路设计”课程教学改革

“数字集成电路设计”是微电子科学与工程专业重要的专业核心课。在课程中引入OBE教学理念,以学生毕业从事集成电路设计工作应达成的能力目标为导向,逆向设计课程教学方案。从课程理论讲授到工程项目案例教学,对学习目标达成情况进行跟踪并针对教学活动和目标持续改进,形成面向能力目标的教学效果评价体系。课程教学的实施有助于帮助学生独立解决科学与工程问题,同时锻炼了学生的工程实践能力和创新能力。     

TVS在数字移动电话电路中的设计与应用

针对静电放电和电快速瞬变脉冲群(ESD/EFT)等危险浪涌电压会给数字移动电话带来死机、损坏等致命危害的问题,便于电路设计人员加深对TVS器件的认识,设计出高可靠性的保护电路,文章通过分析TVS器件的特性和主要参数及其工作原理,得出了TVS是一种十分有效地保护器件,但在应用时应当针对不同的保护对象及电路的相关参数来选用元件,同时给出了TVS器件在数字移动电话电路设计中的应用保护电路,并对加强电路本身的抗干扰设计提出了建议。     

一种多通道数字功放输出级电路设计

针对扬声器阵列指向性声源对驱动电路的需求,设计了一种大功率、高效率以及低失真的8通道数字功放输出级电路.对影响电路实现的关键因素进行了深入分析,通过电路结构以及死区时间的优化设计,降低了总谐波失真、噪声和通道间相位延迟.测试表明,输出功率为lW时THD+N(Total Harmonic Distortion+ Noise,总谐波失真加噪声)达到0.087 5％,20 Hz～ 22 kHz频段信噪比达到89.172 dB,通道间相位延迟介于-0.62°～+0.1°之间,单通道效率达到92.1％.     

遗传算法在漫反射系数计算中的应用研究

从一般的目标星等模型出发,利用遗传算法对模型中的漫反射系数进行求解.根据星等测量中存在的星等值起伏的特点,设计了多变点分段遗传算法进行漫反射系数的估计,给出了遗传算法具体的算法设计,并以类圆柱体目标为例分析了算法参数中变点数量选取对计算结果的影响,在合理选择参数的条件下,算法可以较好地逼近目标参数.     

关于数字电子电路设计之中EDA技术的应用探究

中职电类专业中,电子电路技术是一门重要的专业课程.学习这门课程除了要学习课本上的理论知识外,更重要的是要掌握一些的实验操作技能.本文重点阐述了数字电子电路设计之中EDA技术的应用探究.     

Demonstration of the first SiC power integrated circuit

This paper will discuss the development of SiC lateral power junction field-effect transistors (JFETs) and ICs. Normally-off RESURF vertical-channel lateral power JFETs are fabricated and characterized. New results for the first demonstration of SiC Power ICs are presented and the potential for distributed DC–DC power converters at high frequencies is discussed.     

基于遗传算法的组合逻辑电路设计的FPGA实现

基于遗传算法的组合逻辑电路的自动设计,依据给出的真值表,利用遗传算法自动生成符合要求的组合逻辑电路。由于遗传算法本身固有的并行性,采用软件实现的方法在速度上往往受到本质是串行计算的计算机制约,因此采用硬件化设计具有重要的意义。为了证明基于FPGA的遗传算法的高效性,设计了遗传算法的各个模块,实现了基于FPGA的遗传算法。     

数字功放H桥式输出电路的两类PWM比较

H桥式输出电路在数字功放中被广泛采用,其差动平衡式输出可以滤除共模噪声,并实现较大的输出功率,典型的数字功放H桥式输出电路如图1所示,由4个开关与输出滤波器组成。K1-K2,K3-K4分别是桥的2个桥臂,通过控制各个开关的闭合,产生PWM1与PWM2 2个信号,不同的开关控制规律决定PWM1与PWM2的波形不同,但无论何时,每个桥臂的上下2只开关不能同时导通,以防止直通大电流的产生;由L,C     

遗传算法在光栅面形优化设计中的应用

衍射效率高、偏振相关损耗低的衍射光栅是集成波分复用／解复用器件的一种核心元件,在光通信中具有很重要的应用价值,而一般面形的光栅很难达到此要求,为此需要在光栅衍射效率计算的基础上,利用遗传算法对光栅面形进行优化。采用二次函数来描述光栅面形,选取一定的原始样本,利用耦合波方法计算光栅的衍射效率;然后采用遗传算法中的各种算子对样本进行变换,计算变换后光栅面形的衍射效率,选择其中接近所确定条件的样本进行保留;再继续下一次变换和选择,直到满足设定的要求。通过优化最后得到衍射效率高、偏辗相关损耗小的光栅面形,这些面形的光栅衍射效率达到90％以上,而相应的偏振相关损耗小于0．1dB,已经达到光通信中的相应要求。在光栅面形设计中采用了遗传算法进行光栅面形优化为有特定要求光栅的制作提供了理论指导,可以节省一定的人力和渤力、     

An accurate digital baseband predistorter design for linearization of RF power amplifiers by a genetic algorithm based Hammerstein structure

In this paper, a novel digital predistorter design based on the Hammerstein structure is proposed in order to linearize radio frequency power amplifiers. A genetic algorithm optimization method has been proposed to accurately identify the coefficients of a Wiener model for the power amplifier. Digital predistorter design based on the proposed Hammerstein model has been carried out according to the accurate Wiener model. The validation of the suggested model is carried out using the simulation of the power amplifier and the digital predistortion excited by 64QAM signals in the advanced design system software. According to the simulation results, the criterion of an adjacent channel power ratio decreased by about 16 dB. The simulation results show the adjacent channel power ratio of almost ??46 dBc. In order to assess the feasibility of the proposed predistorter, it is completely implemented in the Kintex FPGA using Vivado HLS. This proposed model enables a more accurate modeling of nonlinear distortion and memory effects compared to the previous linearization methods. This paper presents the new linearization method using the genetic algorithm based Hammerstein structure.     

数字集成电路设计教学方法研究与探索

数字集成电路设计课程是集成电路设计方向的一门较为重要的专业课,课程的特点是理论性和实践性非常强,注重培养学生的创新能力及综合能力。但是,目前课程的开展存在诸多问题(如教学方法单一,验证性实验内容相对简单,实验课程考核机制单一等),因此教学方法亟须改进。针对课程中面临的诸多问题,本文立足于教学模式、教学内容以及考核方式三个方面进行改革与探索,提出采用线上线下混合式教学方式,致力于提高学生的主观能动性,让学生的学习由被动变得更为主动,切实提高学生的创新能力。     

基于方程和遗传算法的CMOS模拟单元电路优化

本文在CMOS单元电路优化中采用一种基于方程和遗传算法的优化方法.其采用描述电路行为的性能解析方程和遗传算法实现电路性能指标的优化.仿真结果表明,这种方法可以得到满意的仿真结果,同时所需的优化时间较短.     

Optimal design of digital IIR filters by using hybrid taguchi genetic algorithm

A hybrid Taguchi genetic algorithm (HTGA) is applied in this paper to solve the problem of designing optimal digital infinite-impulse response (IIR) filters. The HTGA approach is a method of combining the traditional GA (TGA), which has a powerful global exploration capability, with the Taguchi method, which can exploit the optimum offspring. The Taguchi method is inserted between crossover and mutation operations of a TGA. Based on minimizing the L/sub p/-norm approximation error and minimizing the ripple magnitudes of both passband and stopband, a multicriterion combination is employed as the design criterion to obtain the optimal IIR filter that can fit different performance requirements. The proposed HTGA approach is effectively applied to solve the multiparameter and multicriterion optimization problems of designing the digital low-pass (LP), high-pass (HP), bandpass (BP), and bandstop (BS) filters. In these studied problems, there are many parameters and numerous local optima so that these studied problems are challenging enough for evaluating the performances of any proposed GA-based approaches. The computational experiments show that the proposed HTGA approach can obtain better digital IIR filters than the existing GA-based method reported recently in the literature.     

基于自适应遗传算法的电力变压器优化设计

在研究遗传算法的基础上,分析了传统遗传算法种群多样性、收敛效率降低和易求得局部最优解的问题,提出自适应遗传算法优化设计电力变压器。采用适应度值标定的遗传算法改进策略,防止特殊个体统治种群导致的寻优结果是局部最优解,在算法临近结束时,变更选择压力,防止算法在最优解附近摇摆,加快了寻优过程。仿真结果表明,改进后的遗传算法收敛速度快,并以S9-315/10型电力变压器为算例,优化方案的性能指标符合相关国标,总损耗降低0.8%,材料成本降低8.3%。     

Process and circuit design interlock for application-dependent scaling tradeoffs and optimization in the SoC era

Several physical phenomena in highly scaled CMOS technology have now become first-order elements affecting the electrical behavior of transistor characteristics. Effects such as STI mechanical stress, direct tunneling in gate dielectrics, gate line-edge roughness, and others can have significant influence on device characteristics. This paper elaborates on these effects to exemplify the need for closer interaction between circuit design and process development teams in order to push out application-dependent scaling limits. The paper also highlights the need for further efforts in the areas of circuit-level device modeling.     

遗传算法在计算机网络优化设计中的应用

计算机网络优化是一个多约束条件的非线性 0— 1问题。针对该问题的特点 ,建立了该问题的数学模型 ,给出了一个解决此问题的遗传寻优算法。通过计算机网络优化设计实例的计算结果表明 ,该方法能快速求出问题的全局近似最优解 ,且具有较高的计算精度