|Sensing (S)||iNtuition (N)|
|End-of-Semester Poster Demonstrations (April 30 - May 1, 2001)|
|Dr. Ayyanar||Proactive Digitally Programmable Switch-Mode Power Supply|
Powering tomorrow’s microprocessors - the successors to the Pentium, is a major challenge to the power supply designer. Two main problems are the requirement of very low output voltages (combined with high currents) and extremely fast load transient response times. The problem of low efficiency experienced with conventional diode rectifiers in low voltage applications, is solved by using synchronous rectifiers employing MOSFETs in place of diodes. To address the problem of response time, proactive solutions are being envisioned, wherein the power supply adjusts its output voltage or even the configuration, in anticipation of a step load change (for example, an upcoming multiplication instruction), on cue from the processor load.
The project involves the following tasks:
Frederick Di Sano,
|Dr. Bird||Fabrication of Semiconductor Devices for Nanostructure Research|
Semiconductor nanostructures are extremely small electrical devices which are patterned on length scales approaching the size of the electron itself, and which offer considerable potential for application in future generations of integrated circuit technology. In this project, students will fabricate, and measure the properties of, prototype semiconductor nanostructures. The work will therefore require the students to familiarize themselves with basic steps in semiconductor processing and to also take a two-day safety class in cleanroom practice. After fabrication, the basic electrical properties of the nanostructures will be measured at low (liquid Helium) temperatures, and analyzed in terms of quantum transport behavior.
|Dr. Duman||Wireless Communication System Design|
This project is concerned with the design of a simple wireless communications system including the computer interface. The system will be easily programmable via the computer interface to adopt different modulation techniques. The main objective is to enable and demonstrate the transmission of bits, and evaluate the system performance. If you are interested, contact Dr. Duman with a transcript and a resume (if you already have one) at the beginning of the semester. Only one group will be selected.
|Dr. Greeneich||Digital Rain Gauge|
Design and breadboard a system to electronically measure rainfall and display the amounts digitally. The display should have a resolution of 0.01 inches.
|Dr. Greeneich||PRA Model 1030A OCXO Benchtop Test System|
|How Wei Low,|
|Dr. Heydt||An Improved Sonic Anemometer|
In Spring 2000, a EEE490 group developed a sonic anemometer. This is a wind speed measuring instrument that has no moving parts. Ultrasound (e.g., 15 kHz) is emitted by a 'speaker' and measured at a microphone. The time required for the transit of the sound from source to the microphone is measured. This time divided by the distance between the two transducers gives the velocity. Since the velocity of sound in air is known, the difference in the measured velocity and the published velocity is the wind speed (i.e., the speed of the medium). This has been implemented in an instrument that measures the N-S and E-W components. The actual instrument does not use the division indicated: rather, a phase difference method is used to perform an analog measurement. This project is to improve on the basic instrument. The improvements must include a third set of transducers to find the wind speed in a third axis (e.g., NW - SE). This measurement is to be used with a mathematical model to obtain an improved measurement of the wind speed and direction. The method to be used is known as 'state estimation' and it is similar to locating a straight line to fit a collection of points (i.e., a least squares fit). Another improvement is to utilize several frequencies for the instrument, and again use the data collected to estimate the wind speed and direction. A nonlinear state estimator is to be studied. Other potential improvements include: experimentation for optimal spacing of the transducers; utilization of aerodynamic farings; use of nonsinusoidal signals as the basic ultrasound signal.
|Dr. Heydt||A Phase Controlled, Series Boost Voltage Conditioner|
Power 'conditioning' refers to maintaining a load at a constant voltage. This is usually an AC load application. Some loads (like computers) are vulnerable to variations in line voltage (sags, spikes, momentary outages). Power conditioners are devices that effectively condition the AC supply voltage so that loads 'see' relatively constant voltage -- no matter what the supply voltage may be. This project relates to the use of a device known as a 'series boost' to hold load voltage constant. The concept is to use a voltage source in series with the supply voltage in order to make the sum (i.e., the source voltage plus the series boost voltage = the load voltage) relatively constant. The series voltage source is developed from a winding of a transformer that is fed by the original supply itself. However, the series transformer excitation is chopped using back-to-back SCRs or possibly a triac. The chopping control is varied in order that the series voltage is the correct magnitude and phase to compensate for supply voltage sags or swells. It is desired to use the simplest possible controller and circuitry so that the power conditioner is simple and cheaply constructed. The project entails the design, simulation, and construction, of a series boost power conditioner as described. The device should be tested under various load and supply conditions.
|Dr. Higgins||Computer Controlled Medicine Dispenser|
|Dr. Higgins||Thermatron Chamber Fan Motor Controller|
|Dr. Higgins||PCI Board Design with DSP Functionality|
|Dr. Holbert||Function Generator with White Noise|
The student team will design and build an analog function generator. The function generator will output sine, square, and sawtooth waveforms via a BNC connection. The frequency of the base waveforms will be user adjustable; the peak-to-peak voltage output level shall be around ± 8 volts. The option to overlay the base waveforms above with wideband (white) noise shall be included. The relative strength of the white noise signal compared to the base waveform shall also be user selectable. Produced analog signals shall be analyzed using computer-based data acquisition and signal analysis.
|Dr. Karady||Remote Current Measurement|
Electric power companies measure the current using old-fashion current transformers. A new emerging concept is to measure the current by monitoring the magnetic field at the ground level. The project objective is to develop an algorithm for calculation of the current from field measurements and perform experiments to prove the feasibility of this new method. Project receives partial support from industry.
|Dr. Karady||Voltage Measurement Using Fiber Optic Cables|
The objective of the project is to develop a measuring system that uses the magnetic field produced phase shift of polarized light. The work requires both computer simulation and experimental work. A company in the valley supports this project.
|Dr. Karady||Multiplexing Data Communication onto Power Distribution Lines|
|Dr. Karam||Face Recognition System|
The students will develop and build a system for face recognition. A camera and a computer will be used as part of the Face Recognition System. The camera will be used to capture pictures of people’s faces to be introduced to and, later, recognized by the system. In addition to developing and implementing face recognition techniques, the students will develop tools to interface the camera with the computer system and will implement a user-friendly graphical user interface.
|Dr. Kozicki||Characterization of Non-volatile Memory Devices|
The Programmable Metallization Cell (PMC) is a novel high density, low power memory technology that was developed at ASU. It uses an electrochemical process to rapidly form a nanoscopic metal connection between a pair of electrodes when a small voltage is applied between them. The metal emerges from a thin film of a chalcogenide glass which may be incorporated easily and cheaply into a conventional integrated circuit. The metal is dissolved back into the glass film by applying a reverse voltage and the result of the formation or dissolution of the tiny wire is a large and consequently easily detected change in the electrical resistance of the device. The resistance changes in PMC are non-volatile, meaning that resistance values persist even when the electrical power is removed from the device. This project concerns an evaluation of the stability of the "on" state of programmed PMC devices with time at temperatures ranging from -55 to 125 deg. C. The project team will be required to design various experiments using existing characterization equipment and carry out the measurements with the protocols developed.
|Dr. Morrell||Telemetry Sensor|
The purpose of this project will be to design a sensor to provide tri-axis telemetry data to a control system. The device will transmit the acceleration, velocity, and position of the probe to a computer station. A major consideration of the project will be the analysis of data and characterization of device parameters from functional tests. The design should be small, robust, and precise. Possible applications for this device include satellite positioning, flight management systems, automotive navigation, and any other system requiring portable telemetry information.
|Philips and Dr. Kim||DC and AC Test Fixture for Testing Analog Devices|
Objective: Research, Design, Fabricate, and Evaluate test fixtures to test both DC and AC parametrics of "state of the art" analog devices. The overall goal of this project is to develop a schematic and test hardware topology to test various analog device parametrics using an high-speed automated temperature test chamber coupled to a universal electrical tester (TMT). This project will require considerable system level research into the automated test chamber, TMT tester, as well as the analog device to be tested. The test fixture topology should incorporate multiplexing techniques so as to provide efficient utilization of the test chamber and tester. This project will require considerable interfacing with Design, Applications, Test, and Product Engineers.
|Dr. Reed||ASUCanSat Communication System|
The CanSat system typically consists of a ground station with one or more "satellites" (CanSats). The following sums up the scope of the proposed EEE 490 project:
|Dr. Rodriguez||Toward the Development of a Flexible Testbed for FAME Research|
(FAME: Flexible Autonomous Machines operating in an uncertain Environment). This project will continue the development of a smart remotely operated (semi-autonomous) tank-like electric vehicle. The goal is to integrate ultrasonic and video for the purpose of navigating and remotely operating the vehicle. GPS solutions will also be examined.
|Dr. Rodriguez||Development of a Single Link Robotic Manipulator|
The goal of this project is to design and build a single link manipulator that can be used within the lab and on our electric vehicles. Toward this end, one immediate goal is to build a low-cost high-precision (inverted pendulum like) pointing device. Students will learn about optical robot dynamics, encoders, potentiometers, dc motors, data acquisition boards, and computer control systems.
|Dr. Si||Toolkit Design for Data Format Transformation|
The project focuses on designing a toolkit, which can transform any given two-dimensional data into a defined table. The original data can be in any format such as text, html, word or any database file format. The final result should be an executable window-based application, which has a friendly interface.
|Dr. Spanias||Design and Implementation of a Microphone Array|
This project involves the design and implementation of a smart microphone array. This array involves using several microphones in a linear configuration. The idea it to develop an electronically steerable multisensor microphone. The project involves both hardware implementation and software development.
|Dr. Thornton||Micropower Oscillators|
This project requires three students. At least one of the students should have completed the EEE 435 Microelectronics course. The project is part of our on-going research and you shall work closely with Dr. Thornton's graduate students. The project is largely experimental with you making devices, measuring their electrical properties and analyzing the data.
Micropower circuits, such as those in digital watches, pagers and pacemakers for example, use CMOS circuits operating below threshold i.e. in weak inversion where the drain current varies exponentially with the gate voltage (see figure below). These circuits consume very little power but have a fairly low operating speed, typically less than a few MHz. This project will explore the use of micropower oscillators based on ring-oscillators. You will design both CMOS and bipolar circuits using commercially available chipsets. The results will be compared with those from the integrated ring-oscillators that we are making in the EEE435 class. The aims of the project are to make a comparative demonstration of ring oscillators using CMOS and bipolar technologies and to determine the parameters that limit their operating frequency in the micropower regime.
|Dr. Tsakalis||MATLAB-based Control of an Inverted Pendulum|
The objective of this project is to stabilize an inverted pendulum in an upright position starting from the stable equilirium. This project will use the MATLAB Real-time Workshop environment and an existing inverted pendulum apparatus. The focus will be on design and implementation of a controller that will be adaptive with a simple on-line parameter estimator.
|Dr. Tsakalis||Process Emulator for the Evaluation of Embedded Controllers|
In the design and implementation of embedded control systems, an important part is to establish that the communication between the controller and the process hardware is smooth and flawless. It is often the case that the sensors and actuators have beenintegrated in the process itself and the controller needs to receive sensor data andtransmit control commands following a specific communication protocol. In the application of interest, the process is a diffusion furnace used in semiconductor manufacturing industries. The process receives inputs from the controller (powers) and sends backoutputs (temperatures and status signals). The process-controller communication takesplace over an RS232 serial connection. The objective of the project is to develop a Simulink-based emulator of the process that can be used to evaluate the embedded controller prior to its actual field implementation. The emulator should behavelike the process under all conditions (start-up, transmission errors, normal operation etc.)
The final demonstration of the project should show that the controller,residing in one computer, can successfully start-up, control, andshut-down the process, a model of which resides in a different computer.Furthermore, the project should also evaluate and suggest procedures toassess the controller sampling rate requirements relative to theavailable communication rates.
|End-of-Semester Poster Demonstrations (Dec. 4-5, 2000)|
|Dr. Ayyanar||Bi-Directional DC-DC Converters for the 42V Architecture of Future Automobiles|
The standard bus voltage in present automobiles is 14V (12V battery). With more and more electrical/electronic functions being introduced, and with the traditional mechanical/pneumatic functions being replaced by their electrical equivalents, the current levels with 14V system are becoming unmanageable. Hence the move towards a 42V bus architecture, where for a given power level the current levels are more manageable and existing power semiconductor devices can be used advantageously. Until the conversion of all electronic devices to the 42V system is fully accomplished, the automobiles will operate with a dual 14V/42V system. The objective of this project is to build a bi-directional DC-DC converter to serve as an interface between the 14V and 42V buses. As the cost and size are of utmost importance for automotive application, many topologies will be analyzed, simulated using PSPICE, and finally the most promising configuration will be implemented.
|Dr. Duman||Wireless Communication System Design|
This project is concerned with the design of a simple wireless communications system including the computer interface. The system will be easily programmable via the computer interface to adopt different modulation techniques. The main objective is to enable and demonstrate the transmission of bits, and evaluate the system performance.
|Dr. Greeneich||Voltage-Controlled BandPass Amplifier|
Design and build a bandpass amplifier in which the center frequency can be controlled by an external voltage. The nominal center frequency will be 100 kHz.
|Dr. Heydt||Wind-up Power Supply (SpringPower)|
Springs have been used for several centuries as energy storage devices. In a 'wind-up' configuration, a spring can be used to store hand motion as mechanical energy. Through a ratchet mechanism, the spring device can be used to operate a small generator upon demand. This project entails the examination of this idea, the researching of generators and spring mechanisms, and the use of electronic converters to obtain a fixed output voltage during normal operation. The concept is to use a wind-up spring to operate a small generator. The generator will be used as a source for an electronic voltage regulator. The regulator may also regulate frequency, and may change voltage level (i.e., a general converter). The possibilities of AC and DC will be explored. The project also includes construction of a prototype, evaluation of efficiency, evaluation of regulation, and the study of potential applications.
|Dr. Heydt||Electric Airplane|
Electric power has been used for many types of propulsion. However, there has been limited success for this application other than in electric railways. In this proposed project, the concept of an electric airplane is considered -- at least at the small model stage. The objective is to construct a small 'model airplane' that operates with an electric motor as the prime means of propulsion. The design team would need to research light, small motors, ceramic magnets, high torque / low weight motors, alternative motor types, and batteries. The battery supply is critical in this application because of the needed low weight to energy requirement. The concept of a speed controller would need to be studied and either adopted or rejected. Wiring of the small model-sized aircraft is also important. The weight and balance, component weight, moments, and other weight related factors of the aircraft need to be studied.
|Dr. Higgins||Programmable Logic Chip Microprocessor|
Implement and test a simple microprocessor in a programmable logic chip. In particular, the simple microprocessor that is simulated in the EEE 120 lab could be used as the basis for this project. The schematic capture capability of the Xilinx Foundation Software would be used to generate the code to be downloaded into a Xilinx XC4010 field programmable gate array chip that resides on a XESS XS40 logic board. The software and hardware are here to start the project immediately.
Katerina La Giorgia
Glen La Boissiere
|Dr. Holbert||LabView Data Acquisition System Development|
The student design team will utilize LabView software and National Instruments hardware to construct a real-time data acquisition (DAQ) system. The DAQ simultaneous sample several channels of data over a user selectable sampling frequency. The LabView system will be used to process the data, and provide the user with the automated capability of analyzing the data using several signal processing techniques (e.g., auto and cross correlation, auto and cross power spectra, etc.), and plotting the results.
|Dr. Pan||Placement and Routing of High-Speed Digital Circuits|
|Dr. Rodriguez||Development of a Controller for a PUMA Robotic Arm|
This project will involve hardware procurement, installation, testing, robot modelling, design, and programming. All work is to be documented in a comprehensive final report.
|Dr. Rodriguez||Development of an Air Based Testbed for FAME Research|
(FAME: Flexible Autonomous Machines operating in an uncertain Environment.) This project will involve the procurement and flight testing of a 20 foot blimp. Storage for the blimp has been arranged at ASU. FAA approval from the Sky Harbor tower is currently being obtained. The blimp’s gondola will be able to carry approximately 40 lbs of equipment. This will include a wireless vision system that will come with the blimp. Specific design issues to be addressed are as follows: (i) addition of a central processing system, (ii) design (or procurement) of an ultrasonic altimeter, (iii) procurement of 3 gyroscopes for attitude measurements, (iv) design (procurement) of a 3 accelerometers for translational motion sensing. All work is to be documented in a comprehensive final report.
|Dr. Roedel||CVD Control|
Design and installation of a LabVIEW-based system to control a Chemical Vapor Phase (CVD) deposition reactor.
|Mike de Vita|
|Dr. Thornton||Micropower Oscillators|
Micropower circuits, for example those in digital watches, pagers and pacemakers, use CMOS circuits operating below threshold, i.e., in weak inversion where the drain current varies exponentially with the gate voltage. These circuits consume very little power but have a fairly low operating speed, typically less than a few MHz. This project will explore the use of micropower oscillators based on ring-oscillators. You will design both CMOS and bipolar circuits using commercially available chipsets. The results will be compared with those from the integrated ring-oscillators that we are making in the EEE435 class. The aims of the project are to make a comparative demonstration of ring oscillators using CMOS and bipolar technologies, and to determine the parameters that limit their operating frequency in the micropower regime.
|Dr. Thornton||Hybrid Molecular-MOS Transistors|
As part of a collaboration between the Departments of Chemistry and Electrical Engineering we are developing polarizable organic molecules that can be bonded as a molecular monolayer to novel MOSFET structures. The threshold voltage of the MOSFET depends on the dipole electric field generated at the surface by the molecular monolayer. When exposed to light the molecule changes its shape and becomes strongly polarized leading to a shift in threshold voltage. Other molecular systems can be designed to be polarized by exposure to particular chemicals. These hybrid molecular-MOS transistors might lead to a new generation of chemical sensors for environmental testing. The aim of the project is to test the sensitivity of the hybrid devices to different ambient conditions.
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