介观RLC并联电路量子效应

研究了介观RLC并联电路系统量子态随时间的演化，结果表明，在外加电源作用下，有耗散的RLC并联电路，系统将由初始的真空态演化到压缩态。     

Flash memory architecture

Flash memories entered the nonvolatile memory scenario only a few years ago, and now these kind of memories are battling to substitute either EEPROM or EPROM. In fact, their peculiarities are becoming quite interesting in present day applications.In system updating, low power consumption, embedded algorithm for program and erase, high density, low cost packages are some of the items which are making the Flash grow in the nonvolatile memory market share.Some words must be spent in explaining what the market is asking of Flash, which are the main applications for these memories, and how their architecture is arranged.The Flash memory cell behaviour will be described, then the fundamental operations (read, program and erase) are explained and some words are used to introduce the redundancy and device testability concept.     

一种频率可调时钟产生电路的研究

研究了一种用于微机械加速度计的CMOS时钟产生电路.该电路可以方便地实现片内时钟的精确产生,集成了具有高电源抑制比的基准电压源,振荡频率可根据需要调节.实际电路采用1.2 μm双层多晶硅、双层金属N阱CMOS工艺实现.在5 V电源电压、800 kHz振荡频率下,该电路功耗约为1.5 mW.     

新型的化学镀锡在无铅焊接之运用

阐述线路板的绿色表面涂覆的化学镀锡工艺的有关理论和技术,化学镀锡应用是实现取代热风整平表面涂覆绿色化的最重要的手段之一。我司第三代化学镀锡应用是突破目前化学沉锡的供应商共拥硫脲作为电位改变剂配方此环节,是一种新型独特的科技。     

基于步进电机非线性折射率测控系统设计

提出了一个基于步进电机非线性折射率测控系统.整个系统以AT89C51单片机为核心,设计了步进电机驱动电路,光电探测电路和A/D转换电路实现对非线性折射率的测量.用VC++6.0编写了上位机软件,实现单片机与上位机通信,对测量数据的分析、处理以及对整个测控系统的控制.     

高速PCB板的电磁兼容设计

以某一嵌入式系统核心PCB板设计为例，介绍了电磁兼容的基本概念及一些高速PCB板设计的基本知识，着重分析了无高频器件时高速PCB板设计中存在的电源系统干扰、地线噪声干扰和信号线阀的串扰等电磁干扰，并分析了这些电磁干扰产生的主要原因，从PCB总体设计和元器件布局、布线等方面考虑，对可能存在的这些干扰，提出了防止和抑制方法以及一些提高PCB板电磁兼容性的具体措施；在工程实践中证明这些方法和措施有效可靠。     

Steady-state solutions for some simple flows of generalized Burgers fluids

The steady-state solutions for three types of unsteady oscillating flows of generalized Burgers fluids are determined by means of the Fourier sine transforms. These solutions are also presented in equivalent forms in terms of elementary functions exp, sine, cosine, hyperbolic sine and hyperbolic cosine. The similar solutions for Burgers, Oldroyd-B, Maxwell, Second grade and Navier-Stokes fluids can be also obtained as limiting cases of our solutions.     

Generation of Chaotic Beats in a Modified Chua's Circuit Part I: Dynamic Behaviour

This paper and the companion one [Cafagna, D. and Grassi, G., Nonlinear Dynamics, this issue] present the new phenomenon of chaotic beats in non-autonomous Chua's circuit, driven by two sinusoidal inputs with slightly different frequencies. In particular, in this paper the behaviour of the proposed circuit is analyzed both in time-domain and state-space, confirming the chaotic nature of the phenomenon and the effectiveness of the design.     

一种高速低功耗ECL多模分频器的设计

本文介络一种高速低功耗ECL多模分频器的电路原理、电路和版图设计特点、工艺技术及研制结果。该分频器设计了0.5mA的内部开关电流和350mV的内部逻辑摆幅,输入输出均采用互补驱动。电路分频模数多,频率高,功耗低,典型功耗75mW,为相同集成度的普通ECL电路功耗的1/30～1/40。该电路广泛用于通讯、仪器仪表和频率合成器等领域。     

DESIGN OF nMOS QUATERNARY FLIP-FLOPS AND THEIR APPLICATIONS

By using the theory of clipping voltage-switches, two kinds of master/slave nMOS quaternary flip-flops are designed. These flip-flops have the capability of two-input presetting and double-rail complementary outputs. It is shown that these flip-flops are effectively suitable to design nMOS quaternary sequential circuits by designing two examples of hexadecimal up-counter and decimal up-counter. Supported by Youth Science & Technology Foundation of Ningbo Science & Technology Commission and by Natural Science Foundation of Zhejiang Province, China