| Department Seminars |
| Spring 2005 |
| Usually 12:30 p.m. Tues., EE 125 |
| Date & Speaker |
Topic |
| Jan. 18 : Russ Cook |
CMOS Layout |
| Jan. 25: Dr. Robert Nelson |
A Few Words about Maxwell's Equations |
 |
| Feb. 1: Benjamin Stockwell |
Remote Monitoring Devices Using IEEE 802.15.4 & GSM/GPRS Networks |
| Feb. 8: Dr. Mark Schroeder |
Signal Analysis of the EEG - What is the Brain Trying to Tell Us? |
| Feb. 15: Xiaoyu Ruan |
The Alternating Greedy Expansion and Computing minimal-weight signed-binary
Expansions from left-to-right in Elliptic Curve Cryptography |
| Feb. 24*:
Blane Wollschlager |
Systems Engineering |
| March 1: Dr. Roger Green |
Thoughts on Frequency Analysis: Fourier Analysis and Wavelets |
| March 8:
David Kahly |
The Moorhead Experience with Wind Generation |
| March 22:
Yingying Kuai |
Testing of PV panels and Maximum Power Point Tracking |
| March 22*:
Benjamin Braaten |
An Integral Equation Technique for Solving Axially
Symmetric Antenna Problems |
| March 23*:
Dr. Maqsood Mohd |
Is Electromagnetic Compatibility Important? A Case
Study of an RF Communication System |
| March
29: Lu Gan |
Artificial Vasculature Device (AVD) Impedance Control |
| April 1*:
Anisur Rahman |
Modeling Nanoscale Devices--Challenges and Approaches |
| April 4*:
Fei Dai |
Local Construction of Connected Dominating Sets in
Wireless Ad Hoc Networks |
| April
5: Dr. Orven Swenson |
Tunable Dye Lasers Pumped by Microchip Lasers |
|
| April 8*:
Hua Tang |
MINLP Based Topology Synthesis of Delta-Sigma Modulators Optimized for Complexity,
Sensitivity and Power Consumption |
| April 11*:
Dr. Shiwen Mao |
Video Communications in Ad Hoc Networks |
| April 13*:
Dr. Paul Juell |
Technologies to Support Interaction for Capstone Courses |
| April 19*:
John Sobtzak |
Analysis and Design of a Wideband Distortionless
Allpass Filter Using a Current Feedback Operational Amplifier |
| April 20*:
Joanna Suresh |
Design of a Micro Array Temperature System
for Biomedical Thermal Imaging Applications |
| April 26:
Dr. Mark Pavicic |
Examples of Nontraditional Electronics Engineering at DTI |
| May 3:
Robert Fischer |
Market Based Transmission Expansion in Interconnected
Electricity Markets |
| May 4*:
Dachuan Yu |
Power Conversion and Control Methods for
Renewable Energy Sources |
May 11: Jinmei Guo |
Postponed |
| June 3*:
Chao You |
A High-Speed, Low Power SiGe BiCMOS FPGA
with New Features |
| June 13*:
Jinmei Guo |
Antenna Factor Calculated Using
Time Domain Numerical Methods |
|
A Video of this seminar is available |
| * Room and/or time different
from the usual |
| ** Note change of date from
original schedule |
A Few Words about Maxwell's Equations
by Dr. Robert Nelson
ECE Dept.
NDSU
Abstract
This talk will provide a "refresher" of what Maxwell's equations say and a few thoughts will be shared of what they mean. Some possible implications of these famous equations will be discussed, some of which may be very unusual. J
If time allows, an overview of some of the past and current research projects in electromagnetics will be provided.
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Remote Monitoring Devices Using IEEE 802.15.4 and GSM/GPRS Networks
by
Benjamin Stockwell
ECE Dept.
NDSU
Abstract
This presentation discusses remote monitoring technology, including IEEE 802.15.4 self-organizing mesh network devices and GSM/GPRS cellular devices.
What are the advantages and disadvantages of remote monitoring? Some topics discussed include power management and scavenging strategies, sensing and communication strategies, and hardware and software solutions.
Some information will be presented about the new Rosemount family of remote monitoring devices.
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Signal Analysis of the EEG - What is the Brain Trying to Tell Us?
by Dr. Mark Schroeder
ECE Dept.
NDSU
Abstract
Since the time of German psychiatrist Hans Berger's first recording of brain activity (electroencephalogram - EEG) in 1929, scientists have been trying to unravel the information contained within the EEG. Nowadays, numerous research labs are trying to use the EEG to provide control of prosthetics and communication devices to those with disabilities. But how is information obtained from this nonstationary, oscillatory signal? Information will be presented on the origin and quantitative analysis of the EEG as they pertain to brain computer interface systems.
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The Alternating Greedy Expansion and Computing minimal-weight signed-binary Expansions from left-to-right in Elliptic Curve Cryptography
by
Xiaoyu Ruan
ECE Dept.
NDSU
Abstract
The alternating greedy expansion of integers is defined to be a binary expansion with digits {0,±1} with the property that the nonzero digits have alternating signs. In this talk we will collect known results about this alternating greedy expansion and complement it with an algorithm for computing a signed-binary expansion of n integers of minimal joint weight from left to right, i.e., from the column with the most significant bits towards the column with the least significant bits. An outline for the proof of optimality will be given. Such an expansion of integers is useful in speeding up the elliptic curve cryptosystems (ECC), which require the computation of å i=013 August, 2008 12:17 PM
em>i ≤ n - 1) are integers and Pi are points on an elliptic curve.
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Systems Engineering
by
Blane Wollschlager
Rockwell Collins
Abstract
Not available
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Thoughts on Frequency Analysis: Fourier Analysis and Wavelets
by Dr. Roger Green
ECE Dept.
NDSU
Abstract
Engineers use a wide range of mathematical tools to investigate the frequency content of signals. Fourier analysis is arguably the most common approach, and it can offer important insights regarding the structure of a signal. It is also possible, and in fact quite common, to misuse Fourier methods.
This talk will review the basics of Fourier analysis, with particular emphasis given to obtaining an intuitive understanding of what Fourier methods are doing and how they can fail. A necessary component to understanding Fourier methods is to understand what is meant by frequency. This, as well as concepts such as time-varying frequency, will be discussed.
Next, the short-time Fourier transform (STFT) is presented as a logical extension of traditional Fourier analysis. However, the STFT also has significant limitations. To understand some of these limitations, a brief discussion of basis functions and their structure is helpful.
Understanding the limits of the Fourier basis functions encourages different approaches for signal analysis. Wavelets are one such possibility. Unfortunately, many engineers are unfamiliar with the topic of wavelets. This talk will conclude with a brief introduction to wavelets, including a current research application that may benefit from a wavelet approach.
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The Moorhead Experience with Wind Generation
by David Kahly*
ECE Dept.
Moorhead Public Service
Abstract
This talk covers the decision process used by Moorhead Public Service to proceed with the construction of two wind turbines. Customer response to the program, some contractual issues and the financial analysis are discussed. Photos of the construction will be shown. Future challenges for wind generation in Moorhead are also discussed.
* David Kahly is a 1982 BS EEE graduate of NDSU with an emphasis in power. He initially worked for Gillette, Wyoming, before joining the Moorhead Public Service in 1984. He has been Project Engineer and an Engineering Manager. He is now the Electric Division Manager. Previous to NDSU, he served 4 years in the US Air Force as an electronics technician. His wife Annette is from North Dakota and they have four children: Zachary - senior at Uof M in aerospace engineering, Ryan - sophomore in English at NDSU, Heather - a senior at DGF, and Tim - a junior at DGF.
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Testing of PV panels and Maximum Power Point Tracking
by Yingying Kuai
ECE Dept.
NDSU
Abstract
An electronic load designed for the field testing of Photovoltaic (PV) panels will be presented. The field testing of PV panels could be challenging due to the fast-varying, and temperature and illumination dependent I-V characteristics of PV panels. The only way to "capture" the PV panel's I-V characteristic at a given condition is to "scan" the load (resistance) over a wide range within a short time. The proposed scheme uses a linear MOSFET as the active element to trace the PV panel's I-V curve within a few milliseconds. The scheme also outputs the panel's other important parameters such as the open circuit voltage, short circuit current, maximum power and the voltage and current at the maximum power point. Both the theoretical and experimental details of the electronic load will be discussed during the seminar. In addition, a new algorithm for the Maximum Power Point Tracking (MPPT) will be described.
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An Integral Equation Technique for Solving Axially Symmetric Antenna Problems
by
Ben Braaten
ECE Dept.
NDSU
Abstract
Previously, Electric Field Integral Equations (EFIE) were derived for axially symmetric electromagnetic scattering problems. These problems contained both electrically small and electrically large regions. The electrically small regions are denoted as quasi-static regions and they contain both perfect dielectrics and conductors and can be geometrically complex. The full-wave regions contained thin-wire perfect conductors only. It was assumed that electrostatic effects were dominant in the quasi-static regions. This work involved deriving new EFIE without the electrostatic assumptions in the quasi-static regions. The moment method was then used to explicitly solve for the charges and currents in the newly derived EFIE. This method was then successfully validated by solving various known antenna problems.
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Is Electromagnetic Compatibility Important?
A Case Study of an RF Communication System
by
Dr. Maqsood Mohammed*
Sverdrup Technology, Inc.
Eglin AFB, FL
Abstract
Electronic technology is ubiquitous in our daily lives. While this is a boon for our civilization, it could prove to be a bane if not implemented properly. A necessary byproduct of massive proliferation of electronics technology is unwanted interactions among various electronic systems.
This presentation introduces the concept of electromagnetic interference and electromagnetic compatibility. Numerous examples are presented to illustrate the importance and criticality of these concepts, especially when not addressed upfront at initial system design level. An RF communication system is analyzed in a tutorial manner to highlight the methodology of studying and assessing electromagnetic compatibility in a telemetry system. The presentation concludes by focusing on the new and upcoming technology of electromagnetic modeling and simulation, its limitations and the need for its validation.
*Dr. Maqsood Mohammed received his PhD in ECE from Oklahoma University. He has worked in academia, and several industries including medical, process control, computer, and communication industries before joining Sverdrup Technology, a defense related company at Eglin AFB in 1987. Currently, he is the Technical Fellow for EM Effects and is the head of the EM Effects Center of Excellence, where he is responsible for ensuring EMC of all systems developed for Eglin AFB. During his tenure at Eglin AFB, his innovative contributions include assessing lightning effects without testing at lightning current levels, EM M&S tools V&V methodology, and HPM test facility development. Dr. Mohammed is also the Chair of the IEEE EMC-S Education and Student Activities Committee where he has introduced several educational programs for the benefit of students as well as professionals during last 12 years. Notable among them are Fundamental Tutorials, and Student Design Contests. He has presented more than 100 papers in conferences and symposia. He has authored more than 50 unclassified technical reports. He has presented several short courses and seminars in electromagnetic effects. He has received numerous citations and awards from Eglin AFB, Sverdrup Technology, IEEE and Best Instructor awards from seminars, symposia, and short courses. His current research interest is in EM Modeling and Simulation, and high power microwaves.
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Artificial Vasculature Device (AVD) Impedance Control
by Lu Gan
ECE Dept.
NDSU
Abstract
A servo pump system for an Artificial Vasculature Device (AVD) designed to regulate the desired impedance relation between the motion of an actuator in the AVD and the pressure applied on it will be presented. In practice, the heart system will eject a known stroke volume into the AVD per unit time (flow). The actuator will be controlled to produce a back-force (pressure) on the variable-volume reservoir to match the desired pressure characteristics (impedance). A control algorithm for this active compliant motion of the actuator will be discussed during the seminar. In addition, the proposed experiment for the dynamic properties of the heart will be described.
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Modeling Nanoscale Devices--Challenges and Approaches
by Anisur Rahman
Electrical & Computer Engineering
Purdue University
West Lafayette, Indiana
Abstract
For past four decades the miniaturization of CMOS technology has been guided by the Moore's Law which states that the number of transistors per unit area in an IC chip will double every 18 months. Presently, the development of the 90 nm ITRS technology node (50 nm physical gate length) is at the final phase, and the commercial ICs using this technology will be available in 2006. Following the same trend of miniaturization, the physical gate lengths of the transistors in 2011 are anticipated to be 10 nm (~ 80 atoms) which clearly falls in the regime of nanotechnology. While aggressively scaling the feature sizes, the semiconductor industry also faces major obstacles in maintaining the performance enhancements, and understanding the physics of their operations has been a field of intense research. Unlike the conventional device modeling, for nanoscale CMOS devices the quantum mechanical effects and ballistic transport of charge carriers play the most important role. In order to continue the performance enhancements, in addition to scaling, new device designs and novel channel materials are also actively pursued. In this talk, I will discuss the state of the art modeling and simulation techniques of such devices, and will show why these approaches will allow the continuation of IC scaling with enhance performances till the middle of next decade.
The first part of the talk will cover the ballistic transport of charge carriers in the nanoscale CMOS devices. My focus will be on the physics of ballistic transport, roles of device design and bandstructure on ballistic transport, and an analytical transport model describing the ballistic transport. In the second part of my talk, I will discuss the quantum mechanical modeling, using effective mass approach, of n-MOSFETs fabricated on arbitrarily oriented wafers and/or alternative channel material devices. Effective mass approach, being a continuum model, becomes less accurate to describe nanoscale devices, and in the third part of my talk I will discuss the use of semi-empirical tight-binding approach for atomistically modeling the ultimate CMOS devices. Here, my focus will be on the need for a 20 band sp3d5s*-SO tight-binding model to describe the device, its application to finite dimensional systems, and key results obtained using this model. Finally, I will summarize the strengths and weakness of all simulation approaches to explore the vast design space associated with the ultimate CMOS devices.
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Local Construction of Connected Dominating Sets in Wireless Ad Hoc Networks
by Fei Dai
Department of Computer Science and Engineering
Florida Atlantic University
Boca Raton, FL 33431
Abstract
Wireless ad hoc networks are infrastructure-less multi-hop networks consisting of mobile (such as in mobile ad hoc networks) or stationary (such as in wireless sensor networks) wireless devices. These networks involve several challenges, including limited bandwidth and energy resources, frequent topology changes, and lack of central control. Local acting, self-organizing, and self-healing algorithms (also called localized algorithms) are essential to the design of wireless ad hoc networks. A connected dominating set (CDS) is frequently used in wireless ad hoc networks to support efficient routing, efficient broadcasting, and area monitoring. For efficiency and robustness, the ideal CDS construction algorithm is light-weighted, has fast convergence, and minimizes the CDS size. This talk discusses localized algorithms for the fast construction of a CDS in wireless ad hoc networks, its application in efficient broadcasting, and mobility management schemes that maintain a CDS in a highly dynamic environment.
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Tunable Dye Lasers Pumped by Microchip Lasers
by Dr. Orven Swenson
Dept. of Physics
NDSU
Abstract
The commercial availability of Nd:YAG "microchip lasers" has breathed new life into the venerable dye laser. These so called microchip lasers are diode laser pumped and passively q-switched with typical Nd:YAG gain medium dimensions of 1 mm on a side. Their 1.06 micron output can be frequency doubled or tripled to produce 532 and 355 nm pump beams for miniature dye lasers. These pump beams have high beam quality, energies of microjoules, pulsewidths of a nanosecond or less, and repetition rates of 1-10 kHz. Adding tunability with the dye laser provides ideal characteristics for applications such as the fluorescence of proteins. I will review some of the complications of pumping with such small energies and short lifetimes and also the advantages. I will also present results for a microchip pumped dye laser in the Littman configuration.
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MINLP Based Topology Synthesis of Delta-Sigma Modulators Optimized for Complexity, Sensitivity and Power Consumption
by Hua Tang
Department of Electrical & Computer Engineering
State University of New York at Stony Brook
Stony Brook, NY
Abstract
The presentation proposes a novel topology synthesis methodology for single-loop single-bit Delta-Sigma modulators. The goal is to explore all the possible topologies and obtain the optimal topology under various design considerations, such as hardware complexity, modulator sensitivity and power consumption. We defined a generic modulator architecture that incorporates all possible feedback and feedforward signal paths, and then derived the symbolic Noise Transfer Function and Signal Transfer Function for the generic topology. We used the symbolic transfer functions to formulate the topology exploration problem as a MINLP (Mixed-Integer Nonlinearly Constrained Programming) problem that simultaneously generates and selects the optimal modulator topology with respect to the cost function. Experiments show the superiority of synthesized topologies as compared to traditional modulator topologies.
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Video Communications in Ad Hoc Networks
by Dr. Shiwen Mao
Electrical & Computer Engineering
Virginia Tech
Blacksburg, VA
Abstract
Ad hoc networks are wireless mobile networks without an infrastructure. As developments in this area continue, there is a compelling need for content-rich multimedia services, which carry more substantial information than simple data communications and leverage the value of ad hoc networks. It is, however, a great challenge to provide multimedia service in such networks, due to highly fragile paths and persistent congestion. We found that the use of multiple paths concurrently for a multimedia session, termed multi-path transport, is highly effective in combating such fragile paths and frequent congestion in ad hoc networks. Indeed, multi-path transport provides a new dimension in designing robust media streaming systems.
In this talk, I will introduce a general architecture for video communications in ad hoc networks, which combines multi-stream video coding with multi-path transport, as well as multi-path routing. My research addresses various issues related to this architecture and aims to provide practical solutions. I will give a brief review of our research efforts with this architecture. After the big-picture, I will then focus on two pieces of works. First, I will show how to adapt existing video codecs to multi-path transport. Specifically, I will introduce three multi-stream coding schemes, which are all compatible with current video coding standards and exploit path diversity for improved video quality in highly dynamic ad hoc networks. Second, I will present a recent work on multi-path routing for MD video in ad hoc networks. In this work, we follow an application-centric, cross-layer approach and formulate an optimal routing problem that explicitly minimizes video distortion. To address this highly complex combinatorial problem, we introduce a Genetic Algorithm (GA) based approach that efficiently computes near-optimal solutions, as well as a tight lower bound for the achievable distortion. Finally, if time permits, I would like to show a multi-path video streaming test-bed we developed for proof-of-concept and for demonstrating the advantages of the proposed schemes.
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Technologies to Support Interaction for Capstone Courses
(How I Spent My Summer Vacation)
(The Web Knows)
by Dr. Paul Juell
Computer Science Dept.
NDSU
Abstract
During the summer of 2004, Paul Juell was in Cairo and spearheaded setting up three video conferences between NDSU and Cairo. Sandy Sprafka, from ITS, worked with Paul Juell, from NDSU, and made sure we had a working system and that larger goals of communication and personal interactions happened. Paul Juell and Sandy Sprafka will talk about that experience, the process and some related examples.
Another technology to support group work is the Wiki, world writable web pages. The Computer Science Department is currently using a version of Wiki called TWiki to support interaction between student and companies for the capstone course. Paul Juell will talk about what the Computer Science Department is doing and how it is being received.
URL for the talk is:
http://twiki.cs.ndsu.nodak.edu/twiki/bin/view/AISeminar/CapstoneCS05
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Analysis and Design of a Wideband Distortionless Allpass Filter Using a Current Feedback Operational Amplifier
by
John Sobtzak
ECE Dept.
NDSU
Abstract
The use of operational amplifiers in analog design usually involves calculations prepared based upon an ideal opamp model for a voltage feedback based device. Here, initial research into the analysis and design of a wideband distortionless allpass filter using a current feedback operational amplifier will be presented. The problem revolves around the desire to create such a filter to buffer/amplify a wideband signal as part of a pre-amplifier stage for a switched-capacitor analog-to-digital converter (ADC).
An introduction to the problem is presented followed by desired system response of the pre-amplifier stage, including input signal and distortionless allpass filter charactersitics. A basic amplifier design is given and its shortcomings noted. Analysis of the current feedback operational amplifier that forms the "engine" of the design is then discussed, proceeding from the ideal open-loop opamp model to more comprehensive open-loop, discrete component and mathematical models appropriate for wideband applications. Emphasis thus far is on modeling the operational amplifier's internal circuitry to identify the causes of performance limitations. Future work centers on the "tuning" of the current feedback opamp through external circuitry to achieve desired results.
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Design of a Micro Array Temperature System for Biomedical Thermal Imaging Applications
by
Joanna Suresh
ECE Dept.
NDSU
Abstract
A contact thermal measurement system that can function as a thermal imaging device would be very useful in the diagnosis and management of certain nerve related diseases. If the device is built using low cost materials and fabrication techniques and with a similar visual indicator as that of a thermograph, then the cost of such screening/testing can be decreased significantly. This presentation gives an approach to the development of such a device in the microscale domain. The fabrication of micro scaled or MEMS (MicroElectroMechanical Systems) based systems and the feasible options for designing such a system are outlined.
Since the development of such devices is very complex, a combination of analytical equations and simulation software is used. A comparative analysis of the available software development tools was undertaken to decide on a suitable user friendly development tool. Many manufacturing issues which have to be considered in the design of the system are addressed. The device is then modeled as a first order linear system and the system response is verified by using MEM Research software. Using the software tool, layout of the temperature array is visualized and certain parameters of interest like the current density and frequency response are presented and discussed. The software is also used for exporting the design files to AutoCAD DXF files so they can be used for the fabrication. The future outcome of the development of the device and the insights gained from the work are presented.
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Examples of Nontraditional Electronics Engineering at DTI
by Dr. Mark Pavicic
Chief Electronics Engineer
Dakota Technologies, Inc.
Abstract
The word "nontraditional", in the title of this seminar, is intended to suggest there may be something different about how electronics engineering is done at DTI. You be the judge as the speaker presents a few examples from a multi-year project to create a new high-speed digitizing technology for use in DTI's products.
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Market Based Transmission Expansion in Interconnected Electricity Markets
by
Robert Fischer
ECE Dept.
NDSU
Abstract
In a regulated monopoly structure, transmission planning was determined based on the need for more power and the path for the transmission expansion was determined by the location that minimized the related costs to the systems security constraints. With the movement from a regulated monopoly structure toward an open, competitive market environment, transmission expansion has grown from a factor of increasing reliability and planning for future loads to a tool for increasing social welfare. Transmission expansion can significantly alter energy prices as well as power flow in a transmission network. Therefore, transmission expansion in a competitive market environment needs to be evaluated from an economic point of view.
In this talk, I will discuss transmission planning issues in interconnected electricity markets. I will also present a systematic method to identify the optimal location for a new transmission line to maximize the social welfare of interconnected markets. A numerical example will be presented to illustrate the proposed method using a decentralized DC-OPF with a realistic model based on possible future demand issues and future generation costs.
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Power Conversion and Control Methods for Renewable Energy Sources
by
Dachuan Yu
ECE Dept.
NDSU
Abstract
In recent years, there has been an increase in the use of renewable energy due to the growing concern over the pollution caused by fossil-fuel-based energy. This dissertation focuses on the power conversion and control for two major renewable energy sources: Photovoltaic (PV) and fuel cell. Firstly, a current-based maximum power point tracking (MPPT) algorithm is proposed for PV energy. An economical converter system using the above scheme for converting the output from PV panels into 60 Hz AC voltage is presented. Secondly, a novel Pspice-circuit model for the PEM fuel cell stack that is useful in the design and analysis of fuel-cell-based power systems is proposed. The accuracy of the model is verified by comparing the simulation and experimental results. Thirdly, a DSP-controlled three-phase induction-motor drive using constant V/Hz is developed which can be used in a fuel-cell automobile. Finally, a hybrid power system consisting of PV panels and fuel cell is proposed. In the proposed system, PV panels supply most of the power when the sunlight is available and the excess power required by the load is supplied by a fuel cell. Load sharing between a fuel cell and the PV panel is investigated through simulation and experiments.
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Antenna Factor Calculated using Time Domain Numerical Methods
by
Jinmei Guo
ECE Dept.
NDSU
Abstract
The objective of this research is to determine the suitability of using time-domain methods to calculate the complex antenna factor of a dipole antenna. In particular, time-domain methods are used to calculate the incident electric fields and the induced voltages of a dipole antenna. The frequency-domain complex antenna factor is then determined using Fourier transform methods. This time-domain method of determining the complex antenna factor provides a fast alternative to the traditional frequency-domain method. The results determined using the new method are compared to those obtained using MININEC (a frequency domain numerical electromagnetic code). Good agreement is observed for both near-field and far-field cases. As such, we conclude that the new time-domain method provides a fast, accurate alternative to the traditional frequency-domain approach of determining complex antenna factors.
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A High-Speed, Low Power SiGe BiCMOS FPGA with New Features
by
Chao You
Department of Electrical, Computer, & Systems Engineering
Rensselaer Polytechnic Institute
Troy, NY
Abstract
The first Field Programmable Gate Array (FPGA) was introduced by Xilinx in 1985. Since then, FPGAs become denser, cheaper and much more powerful in terms of performance and functionality. More and more applications, such as network routing, signal processing, rapid prototyping design, utilize FPGAs' reconfigurable feature. Currently, most applications operate in microwave range, where regular CMOS FPGAs cannot be used.
The goal of this research is to design a high-speed FPGA, which operates in microwave range. The state of the art IBM SiGe High Performance BiCMOS technique is used. This design is function compatible with the Xilinx 6200 series, operates in 1-20 GHz range and has feasible power consumption. New ideas contributed to this innovation include new multiplexer structure, novel basic cell structure and multi-mode routing power saving method. Three IBM SiGe 7HP chips and 2 IBM SiGe 8HP chips have been fabricated. 10 GHz application measurements are provided.
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Antenna Factor Calculated Using Time Domain Numerical Methods
by
Jinmei Guo
ECE Dept.
NDSU
Abstract
The objective of this research is to determine the suitability of using time-domain methods to calculate the complex antenna factor of a dipole antenna. In particular, time-domain methods are used to calculate the incident electric fields and the induced voltages of a dipole antenna. The frequency-domain complex antenna factor is then determined using Fourier transform methods. This time-domain method of determining the complex antenna factor provides a fast alternative to the traditional frequency-domain method. The results determined using the new method are compared to those obtained using MININEC (a frequency domain numerical electromagnetic code). Good agreement is observed for both near-field and far-field cases. As such, we conclude that the new time-domain method provides a fast, accurate alternative to the traditional frequency-domain approach of determining complex antenna factors.
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