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An accurate analytical I-V model for sub-90-nm MOSFETs and its application to read static noise margin modeling

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第1期13卷 58-70页

作者： Behrouz AFZAL Behzad EBRAHIMI Ali AFZALI-KUSHA massoud pedram School of Electrical and Computer Engineering University of Tehran Department of Electrical Engineering University of Southern California

We propose an accurate model to describe the I-V characteristics of a sub-90-nm metal-oxide-semiconductor field-effect transistor(MOSFET) in the linear and saturation regions for fast analytical calculation of the *** model is based on the BSIM3v3 *** of using constant threshold voltage and early voltage,as is assumed in the BSIM3v3 model,we define these voltages as functions of the gate-source *** accuracy of the model is verified by comparison with HSPICE for the 90-,65-,45-,and 32-nm CMOS *** model shows better accuracy than the nth-power and BSIM3v3 ***,we use the proposed I-V model to calculate the read static noise margin(SNM) of nano-scale conventional 6T static random-access memory(SRAM) cells with high *** calculate the read SNM by approximating the inverter transfer voltage characteristic of the cell in the regions where vertices of the maximum square of the butterfly curves are *** results for the SNM are also in excellent agreement with those of the HSPICE simulation for 90-,65-,45-,and 32-nm *** in the presence of process variations and negative bias temperature instability(NBTI) shows that the model can accurately predict the minimum supply voltage required for a target yield.

关键词： Modeling Nano-scale Process variation Read static noise margin(SNM) SRAM

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低功耗双边沿触发器的逻辑设计

电子学报 1999年第5期27卷 129-131页

作者：吴训威韦健浙江大学电子工程系美国南加州大学电气工程系统系

本文从消除时钟信号冗余跳变而致的无效功耗的要求出发，提出双边沿触发器的设计思想与基于与非门的逻辑设计．用ＰＳＰＩＣＥ程序模拟证实了该种触发器具有正确的逻辑功能，能够正常地应用于时序电路的设计，并且由于时钟工作频率减半... 详细信息

本文从消除时钟信号冗余跳变而致的无效功耗的要求出发，提出双边沿触发器的设计思想与基于与非门的逻辑设计．用ＰＳＰＩＣＥ程序模拟证实了该种触发器具有正确的逻辑功能，能够正常地应用于时序电路的设计，并且由于时钟工作频率减半而导致系统功耗的明显降低．

关键词：低功耗触发器逻辑设计集成电路

A SYNTHESIS METHODOLOGY FOR ECL CIRCUITS BASED ON MIXED VOLTAGE-CURRENT REPRESENTATION

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Journal of Electronics(China) 1999年第4期16卷 359-366页

作者： Wu Xunwei (Department of Electronic Engineering, Zhejiang University, Hangzhou 310028)Qinru Qiu massoud pedram (Department of Electrical Engineering-Systems, University of Southern California, USA) Department of Electronic Engineering Zhejiang University Hangzhou Department of Electrical Engineering-Systems University of Southern California USA

This paper presents a synthesis methodology for ECL circuits based on a mixed voltage-current signal representation and operation defined on the voltage and current signals. The ideas presented in this paper are then demonstrated on the design of an BCL 1-bit full adder. The paper concludes by presenting an algebraic system which is suitable for current signal representation and operation on currents.

关键词： Current signal Circuit synthesis ECL Algebraic system

SYNCHRONOUS DERIVED CLOCK AND SYNTHESIS OF LOW POWER SEQUENTIAL CIRCUITS

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Journal of Electronics(China) 1999年第2期16卷 138-145页

作者： Wu Xunwei (Department of Electronic Engineering, Zhejiang University, Hangzhou 310028)Qing Wu massoud pedram (Department of Electrical Engineering-Systems, University of Southern California, USA) Department of Electronic Engineering Zhejiang University Hangzhou Department of Electrical Engineering-Systems University of Southern California USA

Based on analyzing significance of controlling clock in design of low power sequential circuits, this paper proposes a technique that the gating signal is derived from the master latch in a flip-flop to make the derived clock having no glitch and no skew. The design of a decimal counter with half-frequency division shows that by using the synchronous derived clock the counter has lower power dissipation as well as simpler combinational logic. Computer simulation shows 20% power saving.

关键词： Low power Sequential circuit Logic design Derived clock

Impact of strain relaxation on the growth rate of heteroepitaxial germanium tin binary alloy

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Journal of Semiconductors 2024年第10期45卷 35-41页

作者： pedram Jahandar Maksym Myronov Department of Physics University of WarwickCoventryCV47ALUnited Kingdom

The growth of high-quality germanium tin(Ge_(1–y)Sn_(y))binary alloys on a Si substrate using chemical vapor deposition(CVD)techniques holds immense potential for advancing electronics and optoelectronics applications,including the development of efficient and low-cost mid-infrared detectors and light ***,achieving precise control over the Sn concentration and strain relaxation of the Ge_(1–y)Sn_(y)epilayer,which directly influence its optical and electrical properties,remain a significant *** this research,the effect of strain relaxation on the growth rate of Ge_(1–y)Sn_(y)epilayers,with Sn concentration>11at.%,is *** is successfully demonstrated that the growth rate slows down by~55%due to strain relaxation after passing its critical thickness,which suggests a reduction in the incorporation of Ge into Ge_(1–y)Sn_(y)growing *** the increase in Sn concentration as a result of the decrease in the growth rate,it has been found that the Sn incorporation rate into Ge_(1–y)Sn_(y)growing layers has also decreased due to strain *** valuable insights could offer a foundation for the development of innovative growth techniques aimed at achieving high-quality Ge_(1–y)Sn_(y)epilayers with tuned Sn concentration and strain relaxation.

关键词： GeSn germanium tin strain relaxation groupⅣsemiconductor chemical vapour deposition CVD

Identification of time-varying system and energy-based optimization of adaptive control in seismically excited structure

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 227-240页

作者： Elham Aghabarari Fereidoun Amini pedram Ghaderi Department of Civil Engineering Iran University of Science and TechnologyTehran 16844Iran

The combination of structural health monitoring and vibration control is of great importance to provide components of smart *** synthetic algorithms have been proposed,adaptive control that is compatible with changing conditions still needs to be used,and time-varying systems are required to be simultaneously estimated with the application of adaptive *** this research,the identification of structural time-varying dynamic characteristics and optimized simple adaptive control are ***,reduced variations of physical parameters are estimated online using the multiple forgetting factor recursive least squares(MFRLS)***,the energy from the structural vibration is simultaneously specified to optimize the control force with the identified parameters to be *** is also performed based on the probability density function of the energy under the seismic excitation at any ***,the optimal control force is obtained by the simple adaptive control(SAC)algorithm and energy coefficient.A numerical example and benchmark structure are employed to investigate the efficiency of the proposed *** simulation results revealed the effectiveness of the integrated online identification and optimal adaptive control in systems.

关键词： integrated online identification time-varying systems structural energy multiple forgetting factor recursive least squares optimal simple adaptive control algorithm

Quantifying the thermal damping effect in underground vertical shafts using the nonlinear autoregressive with external input(NARX) algorithm

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International Journal of Mining Science and Technology 2019年第2期29卷 255-262页

作者： pedram Roghanchi Karoly C.Kocsis Mineral Engineering Derpartment New Mexico Institute of Mining and Technology Mining Engineering Derpartment University of Nevada

As air descends the intake shaft, its infrastructure, lining and the strata will emit heat during the night when the intake air is cool and, on the contrary, will absorb heat during the day when the temperature of the air becomes greater than that of the strata. This cyclic phenomenon, also known as the "thermal damping effect" will continue throughout the year reducing the effect of surface air temperature variation. The objective of this paper is to quantify the thermal damping effect in vertical underground airways. A nonlinear autoregressive time series with external input(NARX) algorithm was used as a novel method to predict the dry-bulb temperature(Td) at the bottom of intake shafts as a function of surface air temperature. Analyses demonstrated that the artificial neural network(ANN) model could accurately predict the temperature at the bottom of a shaft. Furthermore, an attempt was made to quantify typical "damping coefficient" for both production and ventilation shafts through simple linear regression models. Comparisons between the collected climatic data and the regression-based predictions show that a simple linear regression model provides an acceptable accuracy when predicting the Tdat the bottom of intake shafts.

关键词： Underground mining Vertical openings Thermal damping effect Artificial neural network Nonlinear autoregressive with external input(NARX)

Correlations between direct and indirect strength test methods

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International Journal of Mining Science and Technology 2015年第3期25卷 355-360页

作者： Kallu Raj Roghanchi pedram Department of Mining Engineering University of Nevada

The difficulties associated with performing direct compression strength tests on rocks lead to the development of indirect test methods for the rock strength assessment. Indirect test methods are simple, more economical, less time-consuming, and easily adaptable to the field. The main aim of this study was to derive correlations between direct and indirect test methods for basalt and rhyolite rock types from Carlin trend deposits in Nevada. In the destructive methods, point load index, block punch index, and splitting tensile strength tests are performed. In the non-destructive methods, Schmidt hammer and ultrasonic pulse velocity tests are performed. Correlations between the direct and indirect compression strength tests are developed using linear and nonlinear regression analysis methods. The results show that the splitting tensile strength has the best correlation with the uniaxial compression ***, the Poisson's ratio has no correlation with any of the direct and indirect test results.

关键词： Uniaxial compression strength test Indirect strength test methods Correlation Regression analysis

In-situ polymerization of lignocelluloses of autohydrolysis process with acrylamide

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Journal of Bioresources and Bioproducts 2023年第3期8卷 235-245页

作者： Haosong Zhao Weijue Gao pedram Fatehi Biorefining Research Institute and Chemical Engineering Department Lakehead UniversityThunder Bay P7B 5E1Canada

In the present study,the hydrolysates generated via autohydrolysis of spruce wood chips were di-rectly used as feedstock for producing *** in-situ polymerization of acrylamide(AM)and lignocellulose(LC)of hydrolysates was successfully *** reaction was optimized to generate lignocellulose-acrylamide(LC-AM)with the highest molecular weight(41,060 g/mol)and charge density(-0.25 meq/g)under the optimum conditions,which were 3 h,60◦C,4%(w)initiator based on the dried mass of hydrolysate,and an AM/LC molar ratio of 5.63.A nuclear magnetic resonance(NMR)spectroscopy confirmed the grafting of acrylamide on *** prop-erties of LC-AM were characterized by the elemental analyzer,zeta potential analyzer,gel per-meation chromatography(GPC),and particle charge detector(PCD).The LC-AM was applied as a coagulant for removing ethyl violet dye from a simulated dye *** results indicated that 47.2%dye was removed from the solution at a low dosage of 0.2 g/*** dual flocculation of LC-AM with other polymers for dye removal is suggested to further improve its effectiveness.

关键词： Polymerization Hydrolysate Lignocellulose Acrylamide Biorefining