Temperature dependent timing in standard cell designs

This paper proposes a methodology to simulate temperature dependent timing in standard cell designs. Temperature dependent timing characteristics are derived from standard delay format (SDF) files that are created by synthesis tools automatically based on SPICE characterizations. In addition, a fast calculation of temperatures using the equivalent Foster RC network is presented. A case study is also presented in this paper where the temperature dependent frequency variation of a ring oscillator is simulated demonstrating the necessity of temperature dependent timing simulations. An adaptively refineable partitioning method for simulating standard cell designs logi-thermally is proposed as well. This paper also introduces recent enhancements in the CellTherm logi-thermal simulator developed in the Department of Electron Devices, BME, Hungary. Finally, the simulation results are compared and verified with the SPICE compatible ELDO analog simulator from Mentor Graphics.     

热释电红外电视系统测温方程研究

运用区域细分方法研究了热释电靶面上获得的目标红外热辐射,并推民了红外电视系统的测温方程,温度方法表明红外电视系统输出信号与目标温度,大气透过率,比辐射率等因素有关,同时给出了相应讨论结果。     

无铅焊料十温区回流焊过程的仿真研究

通过对回流焊接工艺参数传输带速度、各个炉区温度设定和焊膏熔化温度曲线的关系研究,建立了大尺寸PCB组件传热过程的数学模型。基于ANSYS平台,模拟了无铅焊料PCB组件在十温区回流焊接过程中的温度场,从而确定了合适的焊接参数。     

Behaviour of CPW and TFMS lines at high temperature for RF applications in sub-45 nm nodes

Coplanar waveguide (CPW) and thin film microstrip (TFMS) lines integrating porous ultra low-k as inter-metal dielectric layers (k = 2.5) and copper as metal, are for the first time experimentally measured up to 110 GHz and under different temperature conditions, up to 200 °C. The extracted attenuation and propagation coefficients of those transmission lines are compared to simulations performed with MAGWEL software, a frequency domain 3-D Maxwell solver. Based on the characterization results some guidelines related to interconnect design are presented for future applications.     

基于噪声系数的Y因数法测量探讨

噪声系数是衡量一个小信号处理系统噪声性能的重要参数,噪声系数测量对于设计控制系统噪声具有重要的指导作用。该文首先介绍了噪声系数的相关基本概念,接着重点详细描述了噪声系数的Y因数测量方法,并针对如何提高测量的精度,讨论了测量时应注意的相关问题。     

Three-dimensional simultaneous measurements of micro-fluorescent-particle position and temperature field via digital hologram

This paper reports on a new technology of simultaneous measurements of micro-fluorescent-particle position in 3D and of temperature field with high time-resolution. The technology to measure both velocity and temperature field is based on the simultaneity of micro digital holographic particle tracking velocimetry (micro-DHPTV) and laser-induced fluorescence (LIF).     

Study on the basic capacitance–voltage characteristics of organic molecular semiconductors

Capacitance–voltage (C–V) characteristics of organic molecular semiconductors attracted much research interest recently, but no convincing physical mechanism has been established so far. In this work, the C–V characteristics of pentacene-based devices have been systematically investigated at various frequencies. Only one peak occurs when the measuring frequency is less than 3 kHz or greater than 8 kHz. While within the frequency range between the two, two C–V peaks are observed with quite different dependence on temperature, which suggests that the origins of these two C–V peaks are respectively mobile holes and trapped carriers. This conclusion is also experimentally validated with the C–V characteristics of intentionally doped devices.     

基于C8051F340单片机的红外温度监测系统的设计

为实现对装药过程中实时温度的检测,设计了一套C8051F340单片机与时分复用技术进行数据采集和通信的多通道温度采集系统。实验验证了CPLD在进行分时控制时具有计时准确,门选电路设计方便,集成度高的优点,同时结合Silicon Laboratories公司提供的USBXpress开发工具使得单片机与计算机的USB通信实现变得极为简便。     

再流焊温度曲线记录器的研究与应用

目前由于QFP和BGA等器件的大量采用 ,如何准确地测试、调整印制板温度曲线是提高焊接质量的关键。本文重点阐述了WJQ - 3温度记录器的结构与工作原理及应用。     

一种适用于单片集成DC-DC变换器的带隙基准电路

文章设计了一种用于单片集成DC-DC变换器的高性能带隙基准电压电路。当温度从-40℃～125℃变化时,温度系数为23ppm/k,其电源抑制比(PSRR)为54dB。当输入电压在2.5V～6V变化时,基准电压的变化范围为±0.055mV。