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An electromagnetic simulation assisted small signal modeling method for InP double-heterojunction bipolar transistors

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Chinese Physics B 2022年第6期31卷 717-724页

作者： Yanzhe Wang Wuchang Ding Yongbo Su Feng Yang Jianjun Ding Fugui Zhou Zhi Jin School of Microelectronics University of Chinese Academy of SciencesBeijing 100049China High-Frequency High-Voltage Device and Integrated Circuits R&D Center Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China

We present a convenient and practical electromagnetic(EM)assisted small-signal model extraction method for InP double-heterojunction bipolar transistors(DHBTs).Parasitic parameters of pad and electrode fingers are extracted by means of 3D EM *** simulations with a new excitation scheme are closer to the actual on-wafer measurement *** simulation settings are calibrated by comparing measurement and simulation of OPEN and SHORT structures.A simplerπ-type topology is proposed for the intrinsic model,in which the base-collector resistance Rμ,output resistance Rce are deleted,and a capacitance Cce is introduced to characterize the capacitive parasitic caused by the collector finger and emitter ground *** intrinsic parameters are all extracted by exact equations that are derived from rigorous *** method is characterized by its ease of implementation and the explicit physical meaning of extraction *** validations are performed at four biases for three InGaAs/InP HBT devices with 0.8×7μm,0.8×10μm and 0.8×15μm emitter,and quite good fitting results are obtained in the range of 0.1-50 GHz.

关键词： electromagnetic simulation InP double-heterojunction bipolar transistor parameter extraction small-signal modeling

electromagnetic simulation and experimental analysis of microwave heaters for asphalt pavements

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Journal of Southeast University(English Edition) 2011年第4期27卷 410-416页

作者：朱松青张志胜史泰龙东南大学机械工程学院南京211189 南京工程学院自动化学院南京211167 东南大学信息科学与工程学院南京211189

In order to study the thermoelectric efficiency of microwave heating and reproduction of asphalt pavements and the uniformity of reproduction temperature distribution, a waveguide excitation cavity is designed and applied to the structural design of a microwave heater. The structural sizes of the incentive cavities are determined based on the waveguide transmission line theory. Using IE3D software, electromagnetic simulations are respectively carried out in four different situations, including the distances between the magnetron probes （antennas） and a short-circuit board, different horn electric lengths and aperture sizes, different dielectric properties of the asphalt mixture, and the distances between the asphalt surface and the mouth cavity. The results show that, when the distance between the magnetron probe and the short-circuit board is 32.5 ram, it is the best installation site; reduction of aerial length is the main factor in improving the heating uniformity. When the aggregate is limestone, the best heating effect can be produced. Maximum radiation efficiency can be realized by adjusting the space between the heater radiation port and the asphalt pavement. The experimental results of asphalt mixture heating in four different situations have a substantial agreement with the simulation results, which confirms that the developed microwave heater can achieve better impedance matching, thus improving the quality and efficiency of heating regeneration.

关键词： microwave heater excitation cavity structural design electromagnetic simulation temperature distribution experimental analysis

Preliminary Design and Analysis of the DC Reactor for the ITER Converter

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Plasma Science and Technology 2014年第3期16卷 273-277页

作者：杨拧张明李传宋执权于克训庄革徐涛 College of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced electromagnetic Engineering and Technology Institute of Plasma Physics Chinese Academy of Sciences

The DC reactor is an important piece of equipment for restraining loop and ripple currents in the international thermonuclear experimental reactor （ITER） converter power supply system. As the reactor is operated at a steady state of 27.5 kA and needs to withstand a peak current of 175 kA, so the design of the DC reactor used in the ITER converter power supply system is necessary. A new water-cooling dry-type air-core reactor is designed in this work. The detailed structural parameters are calculated by theoretical formulas, and then the structure is optimized by electromagnetic simulation with ANSYS. Finally, thermal and dynamic stability analyses are performed to verify the temperature and stress at a rated current of 27.5 kA and pulsed current of 175 kA. The analysis results show that the temperature and stress meet the requirements of the ITER converter power supply system.

关键词： ITER converter reactor electromagnetic simulation thermal stability dy-namic stability

A broadband 47–67 GHz LNA with 17.3 dB gain in 65-nm CMOS

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Journal of Semiconductors 2015年第10期36卷 149-154页

作者：王冲李智群李芹刘扬王志功 Institute of RF-& OE-ICs Southeast University

A broadband 47-67 GHz low noise amplifier （LNA） with 17.3 dB gain in 65-nm CMOS technology is proposed. The features of millimeter wave circuits are illustrated first and design methodologies are discussed. The wideband input matching of the LNA was achieved by source inductive degeneration, which is narrowband in the low-GHz range but wideband at millimeter-wave frequencies due to the existence of gate-drain capacitance, Cgd. In order to minimize the noise figure （NF）, the LNA used a common-source （CS） structure rather than cascode in the first stage, and the noise matching principle is explored. The last two stages of the LNA used a cascode structure to increase the power gain. Analysis of the gain boost effect of the gate inductor at the common-gate （CG） transistor is also performed. T-shape matching networks between stages are intended to enlarge the bandwidth. All on-chip inductors and transmission lines are modeled and simulated with a 3-dimensional electromagnetic （EM） simulation tool to guarantee the success of the design. Measurement results show that the LNA achieves a maximum gain of 17.3 dB at 60 GHz, while the 3-dB bandwidth is 20 GHz （47-67 GHz）, including the interested band of 59-64 GHz, and the minimum noise figure is 4.9 dB at 62 GHz. The LNA absorbs a current of 19 mA from a 1.2 V supply and the chip occupies an area of 900 × 550 μm2 including pads.

关键词： CMOS 60 GHz low noise amplifier wideband electromagnetic simulation

electromagnetic Properties of a New Microwave Plasma Torch with Double Resonance Configuration

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Chemical Research in Chinese Universities 2016年第4期32卷 549-555页

作者： YU Bingwen JIN Wei ZHU Dan YING Yangwei YU Haixiang SHAN Jin XU Chen LIU Wenlong JIN Qinhan Research Center for Analytical Instrumentation Institute of Cyber-systems and ControlCollege of Control Science and Engineering Zhejiang University Hangzhou 310058 P. R. China Zhejiang Supcon Research Co. Ltd. Hangzhou 310058 P. R. China

In order to obtain a stable plasma and improve the performance of the torch for atomic emission spectroscopy（AES）, the structure of microwave plasma torch（MPT） was analyzed. The transmission and distribution characteristics of the electromagnetic field of the torch configuration with two or three concentric tubes, as well as the metal spacer between inner and intermediate tubes with different depths were simulated with electromagnetic simula- tion software and verified by experiments. The results indicate that the inner tube of MPT plays an important role in strengthening the electric field intensity at the opening end of the MPT and redistributing the electromagnetic field in the whole torch by forming a double resonance configuration, and contributes to enhancing the macroscopic stability and the self-sustainment of the plasma. The stability of the plasma is proved to be excellent when the metal spacer between the inner and intermediate tubes is located at a place 20-30 mm away from the top opening of the torch. A proper location of the spacer can also avoid the formation of a static filament plasma or a rotating plasma rooted from the outer wall of the inner tube. With the help of morphological analysis, the underlying reason why MPT possesses a great tolerance to wet aerosols and air introduction was clearly made, that is, the formation region of the plasma formed with MPT is apparently separated from the reaction zone of it.

关键词： Microwave plasma torch(MPT) Double resonance configuration electromagnetic simulation

Numerical simulation on the Production Mechanism of Surface-Wave Plasmas Sustained along a Metal Rod

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Chinese Physics Letters 2014年第3期31卷 103-106页

作者： ZHU Long-Ji CHEN Zhao-Quan YIN Zhi-Xiang WANG Guo-Dong XIA Guang-Qing HU Ye-Lin ZHENG Xiao-Liang ZHOU Meng-Ran CHEN Ming LIU Ming-Hai College of Electrical and Information Engineering Anhui University of Science and Technology Huainan 232001 State Key Laboratory of Advanced electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024

For interpreting the production mechanism of surface-wave plasmas sustained along a metal rod, electromagnetic simulation on the electromagnetic field distributions and particle-in-cell/Monte Carlo collision （PIC/MCC） simulation of the ionization process are present. The results show that the enhanced electric field of surface plasmon polaritons （SPPs） can be excited in the ion sheath layer between the negative-voltage metal rod and the surface-wave plasmas, which is responsible for maintaining the plasma discharge. Moreover, the spatio-temporal evolutions of plasma density and electric fields are simulated by the PIC/MCC model. It is further suggested that the expanded ion sheath layer can extend the length of plasma domain by increasing the plasma absorbed energy from SPPs.

关键词： electromagnetic simulation

simulation of 3D Heat and Mass Transfer in Glass and Oxide Melts Using the Inductive Skull Melting Technology

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Journal of Iron and Steel Research International 2012年第S1期19卷 99-105页

作者： NACKE Bernard NIEMANN Benjamin SCHLESSELMANN Dirk Institute of Electrotechnology Leibniz Universitt HannoverWilhelm-Busch-Str.4Hannover D-30167Germany Auer Lighting Hildesheimer Str.35Bad Gandersheim D-37581Germany

The inductive skull melting technology has many advantages for melting of innovative materials in the field of glasses and *** offers high processing temperatures and the compliance of necessary purities at the same time. Applicable materials are in particular optical glasses,which are applied for lenses,fibers or filters,because the skull melting technology allows high process temperatures and high purities of the final *** the production of glass materials strong requirements have to be fulfilled regarding the optical characteristics,which are mainly defined and influenced by the melting of the raw material and the following refining *** unsolved problem in the melting process of glasses and oxides using the inductive skull melting technology was in the past the unknown heat and mass transfer in the melt because temperature and melt flow measurements in the melt are practically impossible due to the high *** the other hand the temperature and velocity distribution in the melt is very important regarding the safety of the melting process,the process control for producing the required properties of the material or the further development of skull melting *** paper describes a new numerical model which is able to simulate the instationary 3D melt flow of glasses and *** numerical model takes into account electromagnetic,convection and Marangoni *** this a comprehensive view of the hidden processes in the practical experiments could be obtained. By means of the new numerical model different glass and oxide melting processes were simulated and the results were compared with experimental *** comparisons show first of all a very good agreement between experimental and numerical results at the melt *** the numerical results allow to look much deeper inside the melt and show interesting new effects of the heat and mass transfer below the melt surface which were unknown before.

关键词： inductive skull melting oxide melting glass melting 3D simulation electromagnetic simulation melt flow simulation

Numerical simulation of Induced Alterations of Flow Patterns Within Glass Melts using External Lorentz Forces

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Journal of Iron and Steel Research International 2012年第S1期19卷 471-474页

作者： Ulrich Lüdtke Senan Soubeih Bernd Halbedel Department of Electrothermal Energy Conversion Ilmenau University of TechnologyIlmenau D-98693Germany Department of Inorganic-Nonmetallic Materials Ilmenau University of TechnologyIlmenau D-98693Germany

A common way to produce glass is to use melting tanks that work continually with several hundred tons per *** process of efficiently melting,refining,and homogenizing the glass melt is strongly dependent on the flow patterns within the melting *** order to improve the quality of glass products and the efficiency of the melting process,it is necessary to control the flow patterns and to optimize the temperature distribution within the melting *** Lorentz force to create additional flow components based on electric current density distributions and externally generated magnetic fields is an excellent method to obtain targeted and tailored flow *** order to evaluate this method,it is necessary to simulate the induced alterations of the melt *** numerical simulations require the coupling of the electromagnetic and flow field calculations including the energy equation because the electrical conductivity of the molten glass is strongly dependent on the *** idea is to include the calculation of the magnetic field completely into FLUENT using the so-called User Defined Scalars(UDS)and User Defined Functions(UDF).

关键词： glass melting coupled numerical calculation flow simulation electromagnetic simulation FLUENT