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Full-Text Articles in Engineering
Relative Intensity Noise Study In The Injection-Locked Integrated Electroabsorption Modulator-Lasers, Xiaomin Jin, Bennet Yun Tarng, Shun Lien Chuang
Relative Intensity Noise Study In The Injection-Locked Integrated Electroabsorption Modulator-Lasers, Xiaomin Jin, Bennet Yun Tarng, Shun Lien Chuang
Electrical Engineering
No abstract provided.
A High Power, High Efficiency Amplifier Using Gan Hemt, Bumjin Kim, Dennis Derickson, Cheng Sun
A High Power, High Efficiency Amplifier Using Gan Hemt, Bumjin Kim, Dennis Derickson, Cheng Sun
Electrical Engineering
A class B and a class F power amplifier are described using a GaN HEMT device. They both were designed to operate at a frequency of 1.7 GHz with the same bias conditions. The performances of each amplifier were successfully simulated and compared. A class B amplifier was physically implemented and achieved a high power-added-efficiency of 69.2%, 39.9 dBm output power and associated gain of 14.9 dB. The experimental results were in close agreement to the simulation results.
Life Cycle Aware Computing: Reusing Silicon Technology, John Y. Oliver, Rajeevan Amirtharajah, Venkatesh Akella, Roland Geyer, Frederic T. Chong
Life Cycle Aware Computing: Reusing Silicon Technology, John Y. Oliver, Rajeevan Amirtharajah, Venkatesh Akella, Roland Geyer, Frederic T. Chong
Electrical Engineering
Despite the high costs associated with processor manufacturing, the typical chip is used for only a fraction of its expected lifetime. Reusing processors would create a "food chain" of electronic devices that amortizes the energy required to build chips over several computing generations.
Efficiency Study Of Adjustable Speed Drive With Dual Motor Connection, C. Mitsui, S. Tu, Taufik, M. Anwari
Efficiency Study Of Adjustable Speed Drive With Dual Motor Connection, C. Mitsui, S. Tu, Taufik, M. Anwari
Electrical Engineering
This paper presents a study of AC adjustable speed drive when used to operate two induction motors. The impact of running the two motors under various loading conditions and operating output frequency to overall efficiency of the adjustable speed drives under room temperature will be discussed. Data obtained from laboratory and their analysis will be presented
Comparative Study Of Sinusoidal Pulse-Width And Hysteresis Modulations In Current Source Inverter, Taufik, Yat Tam, Makbul Anwari
Comparative Study Of Sinusoidal Pulse-Width And Hysteresis Modulations In Current Source Inverter, Taufik, Yat Tam, Makbul Anwari
Electrical Engineering
In this paper, modeling and comparative analysis of current source inverter (CSI) using sinusoidal pulse-width-modulation (SPWM) and hysteresis modulation (HM) will be presented. The modeling of both CSI-SPWM and CSI-HM are implemented using OrCAD Pspice. Results from the simulations will be presented along with the performance analysis of both inverters. More specifically, comparative analysis pertaining to output current regulation, harmonic contents, and transient response will be discussed. Moreover, further investigation about the effect of current THD, power factor and efficiency for balanced and unbalanced three-phase input sources with ±1%, ±3%, ±5% rms variation at the converter stage to various output …
Digitally Controlled Zvs Quasi-Resonant Boost Converter With M-Type Switch, Taufik, Patrick Luther, Makbul Anwari
Digitally Controlled Zvs Quasi-Resonant Boost Converter With M-Type Switch, Taufik, Patrick Luther, Makbul Anwari
Electrical Engineering
This paper presents the analysis, modeling and design of zero-voltage-switching (ZVS) quasi resonant boost converter. The use of M-type switch in the topology will be described, including circuitpsilas mode of operation along with the derivations of critical voltage and current equations in each mode. Computer simulation using OrCAD Pspice and hardware development for the resonant converter with digital control will be presented. Results from both simulation and laboratory measurements to compare with theoretical analysis will be discussed.
Optimization Of Gallium Nitride-Based Laser Diode Through Transverse Modes Analysis, Xiaomin Jin, Bei Zhang, Liang Chen, Tao Dai, Guoyi Zhang
Optimization Of Gallium Nitride-Based Laser Diode Through Transverse Modes Analysis, Xiaomin Jin, Bei Zhang, Liang Chen, Tao Dai, Guoyi Zhang
Electrical Engineering
We investigate the transverse mode pattern in GaN quantum-well (QW) laser diode (LD) by numerical calculation. We optimize the current GaN LD structure by varying the n-GaN layer thickness. The n-type GaN layer is an important factor to determine the optical mode. Finally, we discuss the lasing performance of the GaN LD based on the transverse optical modes.
Work In Progress - Improving Learning Using Industry Supported Project In Power Electronics Course, Taufik
Work In Progress - Improving Learning Using Industry Supported Project In Power Electronics Course, Taufik
Electrical Engineering
This paper presents an approach that has recently been developed and initiated in teaching undergraduate power electronics course to enhance the learning by exposing students to the most recent state of power electronics technology and applications. The approach involves a hardware project that is supported by industry that is at the forefront of power electronics technology, applications, and devices. The hardware project will be detailed in this paper along with the grading and assessment methods. Difficulties encountered will also be presented.
Work In Progress - Undergraduate Research In Power Electronics - The Super Barrier Rectifier Diode Project, Taufik
Electrical Engineering
This paper presents an undergraduate student research project which involved a new power diode called the super barrier rectifier (SBR) diode. Several projects incorporating SBR diodes in dc-dc converters performed by undergraduate students will be described. Challenges in conducting these projects along with results will also be discussed.
Low-Power-Dissipation Cmos Oscillator Circuits With Capacitively Coupled Frequency Control, Thaddeus Gabara, Vladimir I. Prodanov
Low-Power-Dissipation Cmos Oscillator Circuits With Capacitively Coupled Frequency Control, Thaddeus Gabara, Vladimir I. Prodanov
Electrical Engineering
Methods and apparatus are disclosed for adjusting the frequency tuning range of an oscillator circuit. The oscillator circuit is comprised of at least two MOS devices; a first reactance connecting a drain electrode of a first MOS device to a gate electrode of a second MOS device and a second reactance connecting a drain electrode of the second MOS device to a gate electrode of the first MOS device; and a tank circuit connected to the source and drain electrodes. The first and second reactance may comprises a capacitor or a diode or a combination thereof. In addition, one or …
A System Approach To Integrated Power Amplifier Analysis And Design, Vladimir I. Prodanov, Mihai Banu
A System Approach To Integrated Power Amplifier Analysis And Design, Vladimir I. Prodanov, Mihai Banu
Electrical Engineering
Numerous power amplifier circuits are described in the literature, which seem to follow many distinct design approaches. While circuit implementations may be quite different indeed, the underlining system-level signaling inside these circuits follows similar conditions dictated by the common design objective for high efficiency. This paper presents a general theory for analyzing and designing power amplifiers, providing an insight on the fundamental factors limiting the performance, irrespective of the implementation circuits or technology.
Strong Guiding Of Light In Hollow Nanowire Structures, Liang Chen, James De Leon, Xiaomin Jin
Strong Guiding Of Light In Hollow Nanowire Structures, Liang Chen, James De Leon, Xiaomin Jin
Electrical Engineering
We have theoretically investigated the guiding mode patterns of hollow nanowires. Two types of nanowires, round shape and hexagonal shape, are examined with different combination of outer and inner radii. Because of electric field discontinuity at hollow interfaces and evanescent modes overlap in low refractive index region, strong light guiding and confinement are achieved in both hollow wire structures.
A Self-Tuning Controller For Real-Time Voltage Regulation, Weiming Li, Xiao-Hua Yu
A Self-Tuning Controller For Real-Time Voltage Regulation, Weiming Li, Xiao-Hua Yu
Electrical Engineering
In this research, a self-tuning controller based on multi-layer feed-forward neural network is developed for real-time output voltage regulation of a class of DC power supplies. The neural network based controller has the advantage of adaptive learning ability, and can work under the situations when the input voltage and load current fluctuate. Levenberg-Marquardt back-propagation training algorithm is used in computer simulation. The neural network controller is implemented and tested on hardware using a DSP (digital signal processor). Experimental results show that this neural network based approach outperforms the conventional analog controller, in terms of both line regulation and load regulation.
Finding Lips In Unconstrained Imagery For Improved Automatic Speech Recognition, Jane Zhang, Higinio Ariel Montoya, Brandon Crow
Finding Lips In Unconstrained Imagery For Improved Automatic Speech Recognition, Jane Zhang, Higinio Ariel Montoya, Brandon Crow
Electrical Engineering
Lip movement of a speaker conveys important visual speech information and can be exploited for Automatic Speech Recognition. While previous research demonstrated that visual modality is a viable tool for identifying speech, the visual information has yet to become utilized in mainstream ASR systems. One obstacle is the difficulty in building a robust visual front end that tracks lips accurately in a real-world condition. In this paper we present our current progress in addressing the issue. We examine the use of color information in detecting the lip region and report our results on the statistical analysis and modeling of lip …
Web-Based Design And Analysis Projects For A Junior Level Integrated Circuits Course, David Braun
Web-Based Design And Analysis Projects For A Junior Level Integrated Circuits Course, David Braun
Electrical Engineering
Just as the electronics industry can increase productivity with web-based tools, web-based design offers opportunities to improve education in the area of electronics and integrated circuits. This work describes a variety of web based design and analysis projects for a junior level electronics course and assesses their impact on student learning. Since the course using the projects comprises the second quarter of electronics instruction subsequent to introductory circuit analysis courses, the projects focus on relatively well-defined electronics subsystems. The projects exercise students’ skills with a range of course learning objectives, ranging from lower level calculation, analysis and circuit simulation objectives …
Interdisciplinary Team Teaching: Lessons For Engineering Instructors From A Capstone Course In Environmental Studies, David Braun, Emmit B. Evans, Randall Knight, Thomas Ruehr
Interdisciplinary Team Teaching: Lessons For Engineering Instructors From A Capstone Course In Environmental Studies, David Braun, Emmit B. Evans, Randall Knight, Thomas Ruehr
Electrical Engineering
The capstone course teaches students to analyze global environmental issues, resources, and human activities with a systems approach based on scientific, economic, political, social and ethical perspectives. Such an intrinsically multifaceted subject demands interdisciplinary treatment. To deliver the interdisciplinary treatment, the course uses diverse faculty teams comprised of faculty from fields in the natural and social sciences, engineering, and business. This work describes the interdisciplinary team teaching strategies adopted for the course and how they evolved with subsequent offerings of the course. We present assessment data measuring how well students achieve course objectives. Finally, experience gleaned from this course for …
Photonics Education Program At California Polytechnic State University, Dennis Derickson, Samuel Agbo, Sean Jobe, John Sharpe, Dan Wasche, Xiaomin Jin
Photonics Education Program At California Polytechnic State University, Dennis Derickson, Samuel Agbo, Sean Jobe, John Sharpe, Dan Wasche, Xiaomin Jin
Electrical Engineering
California Polytechnic State University (Cal Poly) has an active photonics-related program. The thrusts of the program are coursework, extensive photonic educational laboratories, an SPIE student branch chapter, and a new Project-Based Learning Institute (PBLI) to promote joint projects with industry.This paper will describe our program for a multidisciplinary approach to photonics education at the undergraduate and master’s degree level.
Improving Dc Power Supply Efficiency With Neural Network Controller, Weiming Li, Xiao-Hua Yu
Improving Dc Power Supply Efficiency With Neural Network Controller, Weiming Li, Xiao-Hua Yu
Electrical Engineering
DC-DC converters can be found in almost every power electronics device. To improve the efficiency and controller response of a DC-DC converter to dynamical ~stem changes, neural network has been chosen as an alternative to classic methods. However, no prior work has been done in the neural network approach for control of a PSFB (phase-Shifted Full-Bridge) converter yet. In this research, a multi-layer feedforward neural network controller is proposed. The neural network based controller has the advantage of adaptive learning ability, and can work under the situation when the input voltage and load current fluctuate. Levenberg-Marquardt backpropagation training algorithm is …
Teaching And Learning Dc‐Dc Converter Design Using Mathcad, Taufik
Teaching And Learning Dc‐Dc Converter Design Using Mathcad, Taufik
Electrical Engineering
This paper presents an approach for teaching and learning dc-dc converter design using MathCAD. MathCAD provides advantages that greatly improve teaching and learning process especially when long and complicated design equations are involved such as those found in dc-dc converters. A design example using Excel is presented and then compared with the same example using MathCAD. Experience learned from using MathCAD in power electronic courses at Cal Poly will be discussed in this paper.
A Multidisciplinary Design Project In Energy Conversion Electromagnetics Course, Ali Shaban, Ahmad Nafisi, Fred Depiero, Taufik
A Multidisciplinary Design Project In Energy Conversion Electromagnetics Course, Ali Shaban, Ahmad Nafisi, Fred Depiero, Taufik
Electrical Engineering
This paper presents a work-in-progress on a new multidisciplinary design project for an Energy Conversion Electromagnetics course at Cal Poly State University. The project is intended to strengthen the skills of electrical and mechanical engineering students by performing design tasks in a multidisciplinary environment. Concurrently, this new design project is implemented to fulfill ABET criterion 3d. The content and format of the project will be described in this paper. Assessments planned for the project will also be discussed.
Ghz Serial Passive Clock Distribution In Vlsi Using Bidirectional Signaling, Vladimir I. Prodanov, Mihai Banu
Ghz Serial Passive Clock Distribution In Vlsi Using Bidirectional Signaling, Vladimir I. Prodanov, Mihai Banu
Electrical Engineering
We introduce a serial passive clock distribution technique allowing efficient and accurate skew removal at any arbitrary clock drop point. The passive transmission medium may be on-chip electrical transmission lines built in current IC technology or possible optical wave-guides in future developments. The proposed technique is naturally insensitive to practical loses and other non ideal effects and has the capability of covering large chip areas.
Super Barrier Rectifier - A New Generation Of Power Diode, V. Rodov, A. L. Ankoudinov, Taufik
Super Barrier Rectifier - A New Generation Of Power Diode, V. Rodov, A. L. Ankoudinov, Taufik
Electrical Engineering
The main principle behind the new Super Barrier Rectifier (SBR) approach is to create the "Super" barrier for majority carriers without unreliable metal-semiconductor Schottky contact. SBR technology creates such barrier in the MOS channel. The height of this barrier can be easily adjusted by the doping concentration in the channel. This paper demonstrates that the new power diodes combine high performance and high reliability for low voltage applications (below 100V). The underlying concepts and analysis of operation are presented as well as the lab test results that compare performance and reliability between Schottky and the new SBR diode.
Digitally Controlled Synchronous Buck Converter, Taufik, M. Starman, M. Anwari
Digitally Controlled Synchronous Buck Converter, Taufik, M. Starman, M. Anwari
Electrical Engineering
The demand for high performance, more flexible and reconfigurable dc-dc converters has pushed dc-dc converter designers to seek for alternative ways to control the pulse-width modulated switch inside the dc-dc converter. During the past few years, efforts have been put forward both by academics and power semiconductor industries to phase out the most commonly used analog PWM controllers with digital controller with its associated software. This paper presents an experimental result of designing and building a 5W synchronous buck converter that employs a microcontroller to process the output voltage signal and translate it into PWM signal to control the switches …