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AlGaAs/InGaAs PHEMT preamplifier for optical communication systems

AlGaAs/InGaAs PHEMT preamplifier for optical communication s...

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International conference on Solid-State and Integrated Circuit Technology

作者： Jinping Ao Shiyong Liu Qingming Zeng Yonglin Zhao Keli Cai Xianjie Li Xhixian Jiao Jianjun Gao Chunguang Liang Electronic Engineering Department Jilin University China National Key Laboratory of ASIC Hebei Semiconductor Research Institute Shijiazhuang Hebei China

the design, fabrication and characteristics of a AlGaAs/InGaAs PHEMT monolithic transimpedance preamplifier is described. the PHEMT material used here is based on /spl delta/-doped carrier supplying layer and GaAs/AlGaAs superlattice buffer. the transconductance and output conductance of a 1 /spl mu/m-gate PHEMT is 250 mS/mm and 8mS/mm respectively with threshold voltage of -1.2 v, the maximum saturation current density is 235 mS/mm. On-wafer network analysis with HP8510 network analyzer shows its cut-off frequency of 21 GHz and maximum oscillation frequency of 40 GHz. Transimpedance preamplifier its measured maximum transimpedance gain of 51.4 dB/spl Omega/ with -3 dB bandwidth no less than 5.05 GHz. the input equivalent-noise current density is 13 PA//spl radic/Hz.

关键词： Indium gallium arsenide PHEMTs Preamplifiers optical fiber communication current density Cutoff frequency optical device fabrication Conducting materials optical materials Gallium arsenide

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design and machining data integration

Design and machining data integration

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International conference on Emerging Technologies and Factory Automation (ETFA)

作者： V. Wolff J.-F. Rigal P. Ghodous M. Martinez CASM INSA Lyon France LIGIM University of Lyon I France PRISMA-IUTB University of Lyon I France

ISBN: (纸本)0780372417

the concurrent design of a product and its manufacturing process requires a shared understanding of products and processes among many experts concerned with design and manufacturing. the objective of this paper is to provide an approach for the representation, integration and communication of different experts' viewpoints in the design and manufacturing phases. Firstly, we describe the problems related to concurrent design and current research works. then we explain how, using the STEP standard, we can represent an integrated design and manufacturing model. As a case study, we consider the tracking of work-piece dimensions through all the different stages of product development, from design to machining. It is based on a model of machining tolerances based on a factory's machine-tool characterization. the chosen application case is a turning process. the model is validated by verification of the theoretical results in the case of machining several representative parts. Experiments point out the efficiency of our machining model. Finally, we present future developments of our integration work.

关键词： Machining Manufacturing processes Product design Virtual manufacturing Product development Process design design engineering Data engineering Collaborative work Standards development

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design of high output DC/DC boost circuit without boost transformer

Design of high output DC/DC boost circuit without boost tran...

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IEEE International conference on Communication and Information Systems (ICCIS)

作者： Qin Hong Liang Zhou Zhongning Jia Chun Liu Jianbo Liu Department of Computer Science Software Engineering Institute of Guangzhou Guangzhou China

ISBN: (数字)9798331531171

ISBN: (纸本)9798331531188

the development of IOT smart devices has necessitated increasingly stringent requirements for DC power sources in terms of output voltage, size, and cost. For instance, Avalanche Photodiodes (APDs), utilized as photodetectors, require a significantly high reverse bias voltage during the detection of feeble optical signals to achieve optimal gain and high signal-to-noise ratio, thereby ensuring exceptional sensitivity. To address the diverse demands of various smart devices for DC power, a high-output DC/DC boost circuit without a step-up transformer has been innovatively designed. this circuit is comprised of four fundamental components: an oscillator circuit, a comparator circuit, a voltage multiplier circuit, and a constant-current and voltage-stabilizing circuit. the paper conducts a comprehensive theoretical analysis of the circuit's topology, parameter selection, and operational process, which is further validated through Multisim simulation. Additionally, a PCB circuit was designed, fabricated, and underwent rigorous practical testing. the test results conclusively demonstrate that the designed boost circuit proficiently provides APDs with the appropriate bias voltage, eliminating the need for boost transformer. It boasts high output voltage, a simplistic structure, small size, and low cost, enabling it to seamlessly share the same input power source with the APD detection circuit and be integrated into the same PCB layout.

关键词： Costs optical device fabrication Avalanche photodiodes Transformers optical amplifiers Voltage multipliers Smart devices Voltage control Oscillators Testing

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design and implementation of a Framework for remote experiments in education

Design and implementation of a Framework for remote experime...

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International engineering, Sciences and Technology conference (IESTEC)

作者： Pavel Kuriščák Pedro Rossa Horácio Fernandes João Nuno Silva Faculty of Mathematics and Physics Laboratory of General Physics Education Charles University Prague Czech Republic Universidade de Lisboa Instituto Superior Técnico Instituto de Plasmas e Fusão Nuclear Lisbon Portugal Universidade de Lisboa Instituto Superior Técnico INESC-ID Lisboa Lisbon Portugal

ISBN: (纸本)9781665498449

Remote Controlled laboratories are a teaching and learning tool that increasingly becomes fundamental in the teaching and learning processes at all levels. A study of available systems highlights a series of limitations on the used programming languages, overall architecture, and network communication patterns that hinder these systems to be further adopted. current technologies and modern WEB architectures allow the resolution of such limitations. Here we present the FREE (Framework for Remote Experiments in Education) platform, a novel system, that, using modern technologies, architectures, and programming practices, will be easier to integrate with external tools and services and new experiments. FREE was developed in Python, Django web framework, HTML, JavaScript, and web services to simplify the development of new functionalities. the designed architecture provides a loose coupling between the infrastructure and the remote experiments facilitating further developments and allowing new experiment integrations. currently FREE is already running in various countries providing access to about five types of, integration with various Learning Management Systems and External Authentication. Using FREE the development and integration of new experiments (independently of their hardware and programming language) is now easier.

关键词： Education Laboratories Process control Authentication Computer architecture Service-oriented architecture Informatics

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A low-power 0.4-22GHz CMOS cascode distributed amplifier for optical communication systems

A low-power 0.4-22GHz CMOS cascode distributed amplifier for...

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IEEE International conference on Electronics, Circuits and Systems (ICECS)

作者： Kimia T. Ansari Calvin Plett Mustapha C.E. Yagoub Department of Electronics Carleton University Ottawa ONT Canada School of Information Technology and Engineering Ottawa University Ottawa ONT Canada

ISBN: (纸本)9781424450909

A CMOS distributed amplifier operating over 0.4-22 GHz is presented. three stages of cascode gain cell are used in this design to enhance the gain and bandwidth performance. To improve the stability of the circuit, a damping resistor is added to the gate of the common gate amplifier in the cascode pair. Our design consumes only 8.6 mW power from a 850 mV supply voltage and this has been achieved through the use of large transistors with low current densities. the design is implemented in standard 0.13 ¿m CMOS technology. the amplifier has a unity-gain bandwidth of 22 GHz, and a maximum small signal gain of 9 dB. Input and output transmission lines are matched to 50 ¿, with the worst case return losses on the input and output of -6 dB and -8 dB, respectively. the chip area is only 750 × 1375 ¿m including all test pads and ESD protections. To the best of our knowledge this is the lowest power consumption among distributed amplifiers showing the same small signal results.

关键词： Distributed amplifiers optical fiber communication Performance gain Bandwidth optical amplifiers CMOS technology Circuit stability Damping Resistors Voltage

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Surface plasmon enhancement of optical absorption of thin film a-Si:H solar cells

Surface plasmon enhancement of optical absorption of thin fi...

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2009 34th IEEE Photovoltaic Specialists conference (PVSC)

作者： R. Biswas D. Zhou B. Curtin N. Chakravarty V. Dalal Department of Physics & Astronomy Ames Laboratory Iowa State University Ames IA USA Microelectronics Research Center Department of Electrical and Computer Engineering Iowa State University Ames IA USA

We design and fabricate a-Si:H solar cells with plasmonic crystal back reflectors demonstrating enhanced absorption of near infrared photons. Rigorous simulations predict plasmonic nanoparticles on ITO can increase absorption in the near infrared. Rigorous simulations also predict plasmonic crystal back reflectors with a pitch of ~750 nm to optimize the enhanced absorption. Such periodic back reflectors have been fabricated with photolithography and a-Si:H solar cells have been grown on them by PECVD. the solar cells display ~9% improvement in short circuit current and external quantum efficiency and a absorption enhancement factor exceeding 8 above 650 nm.

关键词： optical films Plasmons Photovoltaic cells Electromagnetic wave absorption Photonic crystals Predictive models Nanoparticles Indium tin oxide Circuit simulation Lithography

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Motion compensation in a tomographic ultrasound imaging system: toward volumetric scans of a limb for prosthetic socket design

Motion compensation in a tomographic ultrasound imaging syst...

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Annual International conference of the IEEE engineering in Medicine and Biology Society

作者： Bryan J. Ranger Micha Feigin Nikita Pestrov Xiang Zhang Victor Lempitsky Hugh M. Herr Brian W. Anthony the Harvard-MIT Health Sciences and Technology Program Massachusetts Institute of Technology and Harvard Medical School Cambridge MA 02139 USA the Department of Media Arts and Sciences Massachusetts Institute of Technology Cambridge MA 02139 USA the Skolkovo Institute of Science and Techonology Skolkovo 143025 Russian Federation the Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA the Department of Media Arts and Sciences and Harvard-MIT Health Sciences and Technology Program Massachusetts Institute of Technology and Harvard Medical School Cambridge MA 02139 USA

ISBN: (纸本)9781424492695

current methods of prosthetic socket fabrication remain subjective and ineffective at creating an interface to the human body that is both comfortable and functional. though there has been recent success using methods like magnetic resonance imaging and biomechanical modeling, a low-cost, streamlined, and repeatable process has not been fully demonstrated. Medical ultrasonography, which has significant potential to expand its clinical applications, is being pursued to acquire data that may quantify and improve the design process and fabrication of prosthetic sockets. this paper presents a new multi-modal imaging approach for acquiring volumetric images of a human limb, specifically focusing on how motion of the limb is compensated for using optical imagery.

关键词： human body that limb is compensated using optical imagery

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Responsivity analysis of a resonant cavity QDIP at 10 µm wavelength

Responsivity analysis of a resonant cavity QDIP at 10 µm wa...

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International conference on Transparent optical Networks

作者： Ali Mir-Derikvandi Vahid Ahmadi Department of Electrical Engineering Tarbiat Moalem University Tehran Iran

ISBN: (纸本)9781424448258

In this paper, based on 8-band k.p method, we study the infrared wavelength absorption through the conduction subbands of InAs/GaAs pyramidal shape quantum dots (PSQDs) using finite difference method. Considering homogeneous and inhomogeneous broadening effects we design an asymmetric multiple barrier resonant tunnelling (AMBRT) quantum dot infrared photodetector (QDIP) for lower dark current at lambda=10 mum. Considering coverage factor of QDs, quantum efficiency (QE) of QDIP is calculated. Although absorption coefficient of QDs is large, QE is low due to their ultra short effective absorption region. To enhance QDIP-QE and consequently its responsivity an appropriate resonant cavity structure is proposed. We use InGaAs/InAlAs DBR as the bottom reflector for the designed AMBRT InAs/GaAs QDIP and Au as the top mirror. the reflectivity of the DBR is calculated by transfer matrix method. It is shown that with certain periods of InGaAs/InAlAs DBR, QE increases to about 40 times of similar conventional QDIP.

关键词： Resonance Electromagnetic wave absorption Distributed Bragg reflectors Gallium arsenide Quantum dots Indium gallium arsenide Indium compounds Shape Finite difference methods Resonant tunneling devices

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AIGaAs/InGaAs PHEMT Preamplifier For optical Communication Systems

AIGaAs/InGaAs PHEMT Preamplifier For Optical Communication S...

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1998 5th International conference on Solid-State and Integrated Circuit Technology

作者： Jinping Ao Shiyong Liu Qingming Zeng Yonglin Zhao Keli Cai Xianjie Li Zhixian Jiao Jianjun Gao Chunguang Liang Electronic Engineering Department Jilin University Hebei Semiconductor Research Institute National Key Laboratory of ASIC

the design,fabrication and characteristics of a AIGaAs/InGaAs PHEMT monolithic transimpedance preamplifier is *** PHEMT material used here is based onδ-doped carrier supplying layer and GaAs/AlGaAs superlattice *** transconductance and output conductance of a lμm-gate PHEMT is 250mS/mm and 8mS/mm respectively with threshold voltage of -1.2v,the maximum saturation current density is 235mA/***-wafer network analysis with HP8510 network analyzer shows its cut-off frequency of 21GHz and maximum oscillation frequency of 40GHz. the transimpedance preamplifier exhibits its measured maximum transimpedance gain of 51.4dBΩwith -3dB bandwidth no less than 5.05GHz. the input equivalent noise current density is 13PA/Film

关键词： PHEMT AIGaAs/InGaAs PHEMT Preamplifier For optical Communication Systems InGaAs

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A wideband transimpedance amplifier with tee network topology

A wideband transimpedance amplifier with tee network topolog...

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International conference on Solid-State and Integrated Circuit Technology

作者： Rui Yang Shao-Wei Zhen You-Run Zhang Yi-Qiang Zhao Xiao Yang Bo Zhang School of Electronic Science and Engineering (National Exemplary School of Microelectronics) State key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu China

ISBN: (数字)9781728162355

ISBN: (纸本)9781728162362

In this paper, a wideband transimpedance amplifier (TIA) was proposed for high speed optical receiver chips. the proposed TIA replaces feedback resistance in conventional design with a kind of tee network circuit. Consequently, the bandwidth (BW) and phase margin (PM) of TIA are enhanced significantly. Besides, cascade current mirror was also used for improving power supply rejection ratio (PSRR). this wideband TIA was designed in standard 0.35 CMOS technology. Simulation results show that the proposed TIA has a bandwidth of 145 MHz, low frequency transimpedance gain of 93 dBΩ, phase margin of more than 66° and low frequency power supply rejection ratio (PSRR) of -157dB. And the average input referred noise current spectral density is 6. 8pA/√HZ from DC to 500 MHz. the TIA we designed dissipates only 3.5 mW with a 3.3 V power supply.

关键词： Gain Wideband Mathematical model current mirrors Simulation Power supplies optical receivers

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