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power dissipation in oxide-confined 980-nm vertical-cavity surface-emitting lasers

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Chinese Physics B 2013年第1期22卷 257-262页

作者：史国柱关宝路李硕王强沈光地 Key Laboratory of Opto-electronics Technology of Ministry of Education Beijing University of Technology

We presented 980-nm oxide-confined vertical-cavity surface-emitting lasers （VCSELs） with a 16 -um oxide aperture. Optical power, voltage, and emission wavelength are measured in an ambient temperature range of 5 ℃-80 ℃. Measurements combined with an empirical model are used to analyse the power dissipation in the device and the physical mechanism contributing to the thermal rollover phenomenon in VCSEL. It is found that the carrier leakage induced selfheating in the active region and the Joule heating caused by the series resistance are the main sources of power dissipation. In addition, carrier leakage induced self-heating increases as the injection current increases, resulting in a rapid decrease of the internal quantum efficiency, which is a dominant contribution to the thermal rollover of the VCSEL at a larger current. Our study provides useful guidelines to design a 980-nm oxide-confined VCSEL for thermal performance enhancement.

关键词： vertical-cavity surface-emitting lasers power dissipation thermal rollover

Analytical model for power dissipation in cell membranes in suspensions exposed to electric fields

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Journal of Southeast University(English Edition) 2005年第2期21卷 145-148页

作者：覃玉荣江悦华赖声礼华南理工大学电子与信息信学院广州510640 广州军区广州总医院医学实验科广州510010

Due to interaction among cells, it is too complex to build an exactanalytical model for the power dissipation within the cell membrane in suspensions exposed toexternal fields. An approximate equivalence method is proposed to resolve this problem. Based on theeffective medium theory, the transmembrane voltage on cells in suspensions was investigated by theequivalence principle. Then the electric field in the cell membrane was determined. Finally,analytical solutions for the power dissipation within the cell membrane in suspensions exposed toexternal fields were derived according to the Joule principle. The equations show that theconductive power dissipation is predominant within the cell membrane in suspensions exposed todirect current or lower frequencies, and dielectric power dissipation prevails at high frequenciesexceeding the relaxation frequency of the exposed membrane.

关键词： power dissipation analytical model cell suspension external electricfields

Thermal stability improvement of a multiple finger power SiGe heterojunction bipolar transistor under different power dissipations using non-uniform finger spacing

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Chinese Physics B 2011年第1期20卷 667-671页

作者：陈亮张万荣金冬月沈珮谢红云丁春宝肖盈孙博韬王任卿 College of Electronic Information and Control Engineering Beijing University of Technology

A method of non-uniform finger spacing is proposed to enhance thermal stability of a multiple finger power SiGe heterojunction bipolar transistor under different power dissipations. Temperature distribution on the emitter fingers of a multi-finger SiGe heterojunction bipolar transistor is studied using a numerical electro-thermal model. The results show that the SiGe heterojunction bipolar transistor with non-uniform finger spacing has a small temperature difference between fingers compared with a traditional uniform finger spacing heterojunction bipolar transistor at the same power dissipation. What is most important is that the ability to improve temperature non-uniformity is not weakened as power dissipation increases. So the method of non-uniform finger spacing is very effective in enhancing the thermal stability and the power handing capability of power device. Experimental results verify our conclusions.

关键词： heterojunction bipolar transistor thermal coupling power dissipation

Novel multi-tap analog self-interference cancellation architecture with shared phase-shifter for full-duplex communications

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Science China(Information Sciences) 2017年第10期60卷 139-154页

作者： Hongtao LU Chuan HUANG Shihai SHAO Youxi TANG National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China

Multi-tap analog self-interference(SI) cancellation structures adopt parallel taps to reconstruct and then cancel SI in full-duplex radios. Each tap is usually comprised of one fixed delay line, one variable attenuator, and one optional variable phase shifter. To balance the quantity of the variable phase shifters and the achievable SI cancellation(SIC) performance, this paper proposes a novel analog SIC cancellation structure,called shared-phase-shifter constrained multi-tap structure(SMTS). In the proposed architecture, all taps share one phase shifter to emulate the dominated phase offset of the SI channel, which reduces the complexity of the implementation of the multi-tap analog SIC structure and avoids the SIC performance degradation. Then, the proposed SMTS and the existing structures are compared in terms of SIC performance and power ***, extensive simulations show that SMTS provides the close-to-optimal SIC performance as well as the lowest power dissipation relative to the existing multi-tap structures.

关键词： full-duplex multi-tap structure power dissipation phase shifter self-interference cancellation

Influence of body contact of SOI MOSFETs on the thermal conductance of devices

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Journal of Semiconductors 2009年第9期30卷 26-28页

作者：卢烁今刘梦新韩郑生 Institute of Microelectronics Chinese Academy of Sciences

The thermal conductance of devices with different body contacts is studied. A new analytical expression is proposed. This expression can be used in parameter extraction, which gives both good efficiency and high precision. The ratio of thermal conductance of the body contact region to that of the body region is nearly equal to the ratio of the area. The use of an H shape gate body contact is suggested to aid power dissipation in SOI MOSFETs.

关键词： thermal conductance body contact parameter extraction power dissipation

Topology Optimization for Steady-State Navier-Stokes Flow Based on Parameterized Level Set Based Method

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Computer Modeling in Engineering & Sciences 2023年第7期136卷 593-619页

作者： Peng Wei Zirun Jiang Weipeng Xu Zhenyu Liu Yongbo Deng Minqiang Pan State Key Laboratory of Subtropical Building Science School of Civil Engineering and TransportationSouth China University of TechnologyGuangzhou510641China State Key Laboratory of Applied Optics(SKLAO) Changchun Institute of OpticsFine Mechanics and Physics(CIOMP)Chinese Academy of SciencesChangchun130033China Institute of Microstructure Technology(IMT) Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen76344Germany School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510641China

In this paper,we consider solving the topology optimization for steady-state incompressibleNavier-Stokes problems via a new topology optimization method called parameterized level set method,which can maintain a relatively smooth level set function with a local optimality *** objective of topology optimization is to􀀀nd an optimal con􀀀guration of theuid and solid materials that minimizes power dissipation under a prescribeduid volume fraction *** arti􀀀cial friction force is added to the Navier-Stokes equations to apply the no-slip boundary *** a great deal of work has been carried out for topology optimization ofuidow in recent years,there are few researches on the topology optimization ofuidow with physical body *** simulate theuidow in reality,the constant body force(e.g.,gravity)is considered in this *** 2D numerical examples are presented to discuss the relationships between the proposed method with Reynolds number and initial design,and demonstrate the feasibility and superiority of the proposed method in dealing with unstructuredmesh *** 3D numerical examples demonstrate the proposedmethod is feasible in three-dimensional.

关键词： Topology optimization parameterized level set method power dissipation no-slip boundary condition Navier-Stokes equations gravity

Review of advanced CMOS technology for post-Moore era

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Science China(Physics,Mechanics & Astronomy) 2012年第12期55卷 2316-2325页

作者： LI Ming Institute of Microelectronics Peking UniversityBeijing 100871China

The continuous downsizing of device has sustained Moore's law in the past 40 *** the power dissipation becomes more and more serious,a lot of emerging technologies have been adopted in the past decade to solve the short channel effect,leakage and performance degradation *** this paper,the emerging scaling technologies and device innovations,including high-k/metal gate,strain,ultra-shallow junction,tri-gate FinFET,extremely thin SOI and silicon nanowire FET will be reviewed and discussed in terms of the potential and challenge for post-Moore era.

关键词： Moore's law power dissipation performance gain variability HK/MG strain novel device architecture

Efficient Energy Optimized Faithful Adder with Parallel Carry Generation

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Computers, Materials & Continua 2022年第2期70卷 2543-2561页

作者： K.N.Vijeyakumar S.Maragatharaj Dr.Mahalingam College of Engineering and Technology PollachiTamilnaduIndia Dhirajlal Gandhi College of Technology SalemTamilnaduIndia

Abstract:Approximate computing has received significant attention in the design of portable CMOS hardware for error-tolerant *** work proposes an approximate adder that to optimize area delay and achieve energy efficiency using Parallel Carry(PC)generation ***‘n’bits in input,the proposed algorithm use approximate addition for least n/2 significant bits and exact addition for most n/2 significant bits.A simple OR logic with no carry propagation is used to implement the approximate *** the exact part,addition is performed using 4-bit adder blocks that implement PC at block level to reduce node capacitance in the critical *** reveal that the maximum error of the proposed adder confines not more than 2n/*** an enhancement of the proposed algorithm,we use the Error Recovery(ER)module to reduce the average *** results of Proposed-PC(P-PC)and Proposed-PCER(P-PCER)adders with n-16 in 180nm Application Specific Integrated Circuit(ASIC)PDK technology revealed 44.2%&41.7%PDP reductions and 43.4%&40.7%ADP reductions,respectively compared to the latest best approximate design *** functional and driving effectiveness of proposed adders are examined through digital image processing applications.

关键词： Application-specific integrated circuit approximate computing power dissipation energy dissipation image processing

Dual-Port Content Addressable Memory for Cache Memory Applications

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Computers, Materials & Continua 2022年第3期70卷 4583-4597页

作者： Allam Abumwais Adil Amirjanov Kaan Uyar Mujahed Eleyat Department of Computer Engineering Near East UniversityNicosiaN.Cyprus via Mersin-10Turkey Computer Systems Engineering Arab American UniversityJenin240Palestine

Multicore systems oftentimes use multiple levels of cache to bridge the gap between processor and memory *** paper presents a new design of a dedicated pipeline cache memory for multicore processors called dual port content addressable memory(DPCAM).In addition,it proposes a new replacement algorithm based on hardware which is called a near-far access replacement algorithm(NFRA)to reduce the cost overhead of the cache controller and improve the cache access *** experimental results indicated that the latency for write and read operations are significantly less in comparison with a set-associative cache ***,it was shown that a latency of a read operation is nearly constant regardless of the size of ***,an estimation of the power dissipation showed that DPCAM consumes about 7%greater than a set-associative cache memory of the same *** results encourage for embedding DPCAM within the multicore processors as a small shared cache memory.

关键词： Multicore system content addressable memory dual port CAM cache controller set-associative cache power dissipation