Electrical and Electronics Commons^™

The Interfacing Between The A/D Converter, Buffer Memory And Hx-40 Microcomputer, Yu-Hwa Chu

Theses

The data acquisition system which includes A/D converter, buffer memory, and address generator, is to digitize the signal for the computer use. The special feature of this system is the computer controlled digitizing rate over a range from 35K to 0.

The interfacing between Motorola 68000 E.C.B. to H.P. 64000 Development System is the simple example for data communication. How to make the protocal to be compatible is the main point. H.P. 64000 is treated as a host computer because it has the capability for data management and large memory for storing data.

Digital Signal Processing On Tms32010 Evaluation Module And Analog Interface Board, Jiming Sun

Theses

The TMS32010 Evaluation Module (EVM) and Analog Interface Board (AIB) have been used to implement a digital signal processing system. This new system will be the hardware basis for research and development in the DSP field at NJIT in the future. This thesis will serve as a user's guide and overall technical manual for the system.

TMS32010 Assembler, Linker and Simulator in VAX-11 are used to develop the system software, then we can down load the object codes to the EVM through the MODEM in order to test them. By using the A/D and D/A converter as input and output …

Optimization Of Reactive Ionized Cluster Beam (R-Icb) Technique For Deposition Of Gan Films, Veronica S. Kyriacou

Theses

The deposition of GaN film onto glass substrate, using the Reactive - Ionized Cluster Beam deposition technique was studied. The creation of clusters is dictated by various parameters such as the vacuum pressure inside and outside the crucible, the crucible temperature, and the nozzle diameter of the crucible. Optimization of these parameters was experimentally studied, and deposition of gallium films on glass substrates was tried as a first step.

The direct heating method was used at first to get the 1100¬1300°C crucible temperature which was required for the creation of gallium clusters. Although different tungsten wire diameters and different number …

The Gpib User's Manual For Hx-40, Ding-Tang Li

Theses

A completed RS-232 to GPIB interfacing system has been built for HX-40 to master the GPIB oriented machine through its serial port. GPIB commands and data can be transfered between HX-40 and the slave station, which is a HP 3582A spectrum analyzer in this project. The data acquisition from serial to GPIB is done by a well-made GPNET mode 10 interfacing board in a transmitting rate of 9600 baud rate. GPNET exchanges data and commands with HX-40 through a RS-232 port, and passes them to the slave station through a GPIB port which is coordinated by GPIB protocol. A software …

Sputtered Mercury Cadmium Telluride Heterojunction Devices : Electrical Characteristics And Fabrication Process, Ashish N. Mistry

Theses

The main objective of this thesis was to grow high quality epitaxial films of the compound semiconductor Mercury-Cadmium-Telluride (MCT) on Silicon and MCT substrates,using sputtering technology. The research was aimed at investigating the heterojunction behaviour at such interfaces. Detailed studies about the heterojunction theory were made. Devices were made using MCT substrates prepared at the Santa Barbara Research Center (S.B.R. C.),California.

Experiments were designed to grow MCT films with high electron mobility and low carrier concentration in as-grown MCT films and some results were obtained close to reported data for high grade bulk material. Since the parameters involved in sputter …

Design And Construction Of An Atomic Nitrogen Source For Ion Cluster Beam Deposition Of Thin Film Nitrides, Sahar Elgharib

Theses

The objective of this thesis research was to generate atomic nitrogen to react with Ga being deposited by an Ion Cluster Beam method to prepare GaN thin films. An experimental reactor was designed and constructed to generate atomic nitrogen by making use of a microwave induced discharge to dissociate molecular nitrogen into atomic nitrogen. The concentration and the flow rate of the atomic nitrogen arriving at the substrate were measured by titration with nitrous oxide. The experiments were done with 0.32 square cm quartz tubing at room temperature over the nitrogen pressure range from 0.14 torr to 0.56 torr. Results …

Dynamic Laryngeal Analysis : Hardware And Software, Augustine Chan

Theses

A data acquisition and analysis system has been built and tested for the study of laryngeal dynamics: The system uses a computer to control the digitizing rate and to coordinate the pitch prompting for the subject. Tokens of steady state laryngeal vibration are obtained from an electroglottograph when the subject intones a series of computer prompted pitches in a musically scalar sequence. The system digitize the data at a basic rate of 200 samples per laryngeal cycle: This procedure enables the system to perform a modal analysis of laryngeal function: The signal processing and analysis procedure developed displays voice registration …

Design Of Code Division Multiple Access Systems, Nakrendrakumar Patel

Theses

The intent of the work "Design of Code Division Multiple Access systems (CDMA) " is to consider different aspects of design with their effect on system performance. The generation of binary shift register sequences, that is maximal length sequences, with their properties are presented. From these maximal length sequences the Gold codes are obtained which are the most suitable approximately orthogonal codes for designing CDMA systems. These are discussed with their specific crosscorrelation properties. An extensive discussion is given of the difficult problem of synchronization, thatis bothacquisitionandtracking of pseudonoise sequences. Different synchronizing methods are discussed along with their relative performance. …

Reliability Evaluation Of Liquid Crystal Displays Under Accelerated Test Conditions, Ravi Sankar Kalyandrug

Theses

This study has determined the effects of high temperature and humidity on the reliability of liquid crystal dis-plays.

Reliability life testing was done on variety of LCD samples under different operating conditions. All the besting was done under accelerated conditions, including high temperature of 85°C and relative humidity of 70%. A number of failure modes were identified in the long series'of tests.

Among many failure modes such as peeling of seal, degradation of polarizers etc., the most important is the degradation of alignment of liquid crystal molecules. Leakage current measurements were made on all the LCD samples before and after …

Identification Of Linear System With Feedback Input, Jyh Yang

Theses

A new procedure with feedback input is presented for identification of continuous-time systems. Using Lyapunov's direct method to prove it asymptotic stability. For the procedure to be applicable, it's assumed that all the state variables of the plant are accessible and that there is no measurement noise so the model reference scheme can be used to identify the parameters of the plant.

The procedure results in the convergence of every parameter of a model to the corresponding one of the system as the time approaching to infinite i.e. t→∞. Digital computer simulations are provided to demonstrate the feasibility of the …

Further Development Of Preparation And Measurement Techniques For Triode-Sputtered Mercury Cadmium Telluride Thin Films, Tai-On Chan

Theses

The modified MRC 8800 R.F. triode sputtering system was used for mercury vapor sputtering (Hg^1-xCd^x)Te targets onto N-type (111) silicon substrates with a resistivity of 70 to 90 ohm-cm. Deposition rates were in the 2.6 to 3.6 A/sec range, A Hall mobility value, at 87°K, of 2550 Cm²/V•sec with a carrier concentration of 7(10¹⁵) cm^-3 was obtained for 9 μm thick films with an X-value of 0.25. Obtaining good sputtered films reliably was dependent on having targets that would not crack when bombarded with mercury ions. Improvements in the methods used …

Present Reliability Of Liquid Crystal Display Devices, C. N. Suresh

Theses

The purpose of this Thesis is to study the life of liquid crystal display devices as at present available in the market place. To accomplish this, accelerated tempera-ture conditions at 77°C and 85°C were used.

During the last few years, there has grown a tremendous interest in wide range temperature operating and fast LCDs. It is therefore important to understand how LCDs behave under these conditions.

The reliability of a liquid crystal display is usually measured in terms of a quantative degradation in electrical performance and a degradation in visual appearance. The degradation in visual appear6knce may manifest itself as …

Frequency Characterization Of A Thin Linear Antenna Using Diakoptic Theory, Howard Harold Smith

Theses

A frequency dependent analytical expression for the input impedance of a thin wire antenna is obtained using diakoptic theory. In diakoptic theory the linear antenna is seperated into electrically short segments where each segment is treated as a two-port network. This approach eliminates the need for an integral equation formulation. An impedance matrix is found which characterizes coupling between all segments. By expanding the free space Green's function in a power series in wavenumber k each entry in the resultant impedance matrix is obtained as a function of frequency. Enforcement of the continuity of currents and equality of scalar potentials …

Robot Manipulators And Control, Theresa Wu

Theses

This paper on Robot Manipulators brings together theories from three fields : computer graphics, kinematic equations and microprocessor based control.

There are four chapters in this paper, chapter one is the conceptual development on homogeneous transformations, express the position and orientation of the transposition of an object in Cartisian coordinates. Chapter two develops the method of obtaining the Cartisian coordinate position and orientation of the end effector for a manipulator, give the joint coordinate as input and use the homogeneous transformation to express the position and orientation. Chapter 3 is a very difficult one; it solves the parameters for the …

Investigation Of Pre-Detection Signal Processing Of Pseudonoise Communication Signals In The Presence Of Additive White Gaussian Noise And Cw And Bursty Interference, Israel Mayk

Dissertations

By comparison to conventional communication systems, spread-spectrum systems are known to be less affected by interference because of their large dimensionality in signal space. Nevertheless, significant performance degradation is experienced when large interference exists in a few or even one signal coordinates. In this case, interference reduction techniques are also known to provide additional processing gain. A novel class of pseudonoise (PN) invariant algorithms is derived to reduce the impact of interference and restore much of the structure of PN signals received in the presence of interference and noise. A PN signal received by a pre-detection signal process (PDSP) implementing …

The Effect Of A Higher Order Pole On The Optimum Design Of Minimum Threshold Phase Locked Detectors, Bernard Zivotofsky

Dissertations

The phase lockedloop is widely used as an FM demodulator known as a phaselocked detector (PLD). It is particularly useful in the detection of weak signals because lower threshold is possible with a PLD than with a conventional limiter discriminator. An enhanced version PLD known as an extended range phaselocked detector (ERPLD) is capable of further threshold reduction. The most popular PLD is a second order type I system employing a loop filter having one real pole and one real zero.

One implementation of an ERPLD calls for the addition of a differentiator to the standard loop filter which replaces …

A Parameter Identification System For The Human Electroretinogram, Yu-Huai Hsiao

Theses

The human Electroretinogram (ERG) is obtained in a clinical test to detect physiological abnormalities in the eye. A mathematical model of the ERG has been developed, as well as a system to identify its parameters. The system utilizes several computers. The data acquisition and initial processing is done on a previously developed system at the Eye Institute of New Jersey and the University of Medicine and Dentistry of New Jersey, which has been modified to provide the facility for further processing. Software was developed to use a MINC-11/23 computer at New Jersey Institute of Technology to transfer data between the …

Microcomputer Controlled Continuous Activity Monitor For Small Caged Animals, Yogesh Parekh

Theses

The task of this instrumentation system is to measure the activity of rats in a controlled experiment. The system is designed to work in conjunction with the system for studies of metabolic rates in rats. The interface circuits take the picture from a video (vidicon) camera into the computer. Once the picture frame is taken into the high resolution graphics screen memory area, the computer uses this data to detect the activity. The movements of the rat are detected by comparing the number of pixels changed between two consecutive picture frames. The area covered by the rat determines the standing …

16-Channel Signal Analyzer For Electroencephalograms, Junnyih Chiang

Theses

An instrument has been designed to analyze 16 channels of EEG of a squirrel monkey by using several interface boards controlled by an Apple II computer. This instrumentation system is capable of performing these experiments in an automated manner. It stores the data generated on to a floppy disk, with software control and results may be printed out together with related graphs. Because of the limitation of the floppy disk capacity, we had only developed two versions:

(1) To average the EEG signal up to 8 times for all 16 channels, because a lot of memory is needed to save …

Automated Arrhythmia Detection In The Exercise Electrocardiogram, Gregory Ciurpita

Theses

A self-adapting, non-real time method for detecting arrhythmias in single channel Exercise ECG is described. Linear and non-linear digital filtering techniques are used to remove additive noise. A time-varying threshold technique is used to detect R-waves based on amplitude. Feature extraction and matched filter methods are used to classify QRS-waves into existing types, or to create new types. The program works on digitized data from floppy disk and plots all data along with classification results on ReGis graphics terminal or printer. This work will continue so that the system will be capable of processing three-channel ECG in real-time.

Digital Fm-Demodulation Using Digital Signal Processing Techniques, Peter Wagner

Theses

This thesis presents the results of research in the area of digital demodulation of FM signals. The first part of the thesis describes the performance of digital Hilbert-transformers and Differentiators that are optimized in a determined bandwidth. These digital filters are used to build a digital Klapper-Kratt detector. According to this procedure, the coefficients of the digital Klapper-Kratt detectors up to the filter length N=25 are calculated and the resulting discriminator ripple computed and evaluated. One suggested algorithm gives the opportunity to balance the detector at a certain center-frequency. The major part of this thesis describes a new approach towards …

Digitally Implemented Klapper-Kratt Fm Detector Using The Intel-292o Digital Signal Processor, Chang-Hwan Park

Theses

This thesis describes and analyses a digitally implemented FM detector, which is a new member of the family of FM detectors introduced by Drs. Klapper and Kratt.

The properties of the new detector are low delay, excellent sensitivity, extreme linearity, and compatibility of components with integrated circuit technology.

A working model is implemented by adapting FIR digital s signal processing methods, and is realized using the Single-Chip Digital Signal Processor Intel-2920 which is comprised of micro-processor, scratch-pad data RAMs, program store EPROMs, A/D and D/A conversion circuitry, and I/O circuitry.

The performance of the working model shows very good linearity …

A Pitch Based Processor For The Analysis Of Steady State Laryngeal Modes, Tzyy-Jenq Lou

Theses

A data acquisition and analysis stem for use in the study of laryngeal dynamics has been built and tested. The special feature of the system is the computer controlled digitizing rate and coordinated subject pitch prompting. Tokens of steady state laryngeal vibration are obtained from an electroglottograph when the subject intones a series of computer prompted pitchs in a musically scalar sequence. The digital samples of this data are captured by the system at a basic rate of 200 samples per laryngeal cycle. This procedure enables the system to perform a modal analysis of laryngeal function, not unlike the analysis …

Pressure Distributions In Microvascular Network, David Moshenberg

Theses

The objective of this study was to find a practical way of estimating the pressure distribution in a network of microvascular vessels. The pressure distribution was evaluated twice, namely before vasodilations or vasoconstrictions and after the network of vessels reached a new steady state with respect to pressure and flow. Along with determining the pressure distribtuion, the simulation also calculated an effective blood viscosity coefficient for the network.

Poiseuille's equation and the axial component of the equation of motion were used to evaluate the steady state pressure and velocity distributions in each vessel. The continuity equation (conservation of mass) was …

Reliability Problems And Failure Mechanisms Of Solid Tantalum Capacitors, Ghanshyam B. Nakrani

Theses

Today, reliability is acknowledged as an important item in design and the operation of the electronic systems.

This thesis provides some theory, and experiments are instituted to evaluate the reliability for SOLID TANTALUM CAPACITORS made by different manufacturers. The experimental life test work was done at high temperature of 9S 2°C and high humidity of 95 ± 3% on transfer molded tantalum capacitors.

Literature study concentrates on the reliability in solid tantalum capacitors developed between 1961 and 1984.

Several failure mechanisms with figures are illustrated to point out how higher reliability of solid tantalum capacitors may be developed.

The bibliography …

Computerized Instrumentation System For Indirect Measurement Of Metabolic Changes In Rats, Holger Tebbje

Theses

This work describes the further development of a system for the measurement of the energy expenditure of rats. Based on the concept of indirect calorimetry the respiratory exchange is monitored in a controlled experiment. Rats are held in cages through which air is drawn and analyzed. Transducers and sensors, interfaced to the computer, are measuring the composition and the physical parameters of the gas entering and leaving the chambers. The data recieved is processed, displayed on a screen, printed and stored for later analysis.

The accuracy and repeatability of the system improved by measuring additional parameters like barometric pressure and …

Failure Rates And Leakage Current Increase In Tantalum Capacitors Of Different Manufacturers, Joseph G. Grant

Theses

This study has determined the effect of high humidity and temperature on solid tantalum capacitors, from five different sources.

The reasons for using capacitors from five different prestigious sources is to first determine how the parameters change with the different manufacturing techniques used by the different sources. Secondly to rank the different sources according to reliability. The parameters that were measured before and after the "1000 hour" high temperature and humidity test were, capacitance, leakage current, and equivalent series resistance. All the capacitors showed significant increase in leakage current after the test, but there were wide variations in catastrophic failure …

A Method For The Identification Of Parameters In Nonlinear Time-Varying Discrete Systems, Somo Coulibaly

Theses

The purpose of this thesis is to present a new technique for estimating the unknown parameters of nonlinear discrete time-varying systems.

The method is based on the model-reference control system where the model and the plant are controlled to exhibit the same output trajectory. The model is chosen to be linear and stationary. To develop the procedure of identification we assume that the structure of the nonlinear system is known and all the measurements are free of noise. A feedback input is adapted to improve the scheme. This scheme can be used to simultaneously identify the parameters when the control …

Modeling And Analysis Of Switching Dc-To-Dc Converters, Suresh Hariharan

Theses

Modeling and analysis of switching dc-to-dc converters has been achieved through several techniques. The state space averaging technique is valid only for disturbances which are less than one-tenth the switching frequency. The discrete technique does not yield accurate results. In this thesis a new approach to the stability analysis of switching regulators has been discussed and the model is far more accurate than the state space averaging technique or the discrete technique. It can be easily programmed into any computer and the results compare well with the experimental results. It also gives a good insight into the design of the …

Optimization Of The Sputtering Technology For Preparation Of Hg1-[Subscript X] Cd[Subscript X] Te Heterojunction Diodes, Kyriacos Kokkinos

Theses

The deposition of (Hg_1-xCd_x)Te onto Si and (Hg_1-yCd_y)Te (x>y) substrates by rf triode sputtering was studied. Ionized mercury vapor, in the 0.6 to 1.2 micron pressure range, was used to bombard pressed-powder targets, consisting of HgTe and CdTe particles, with effective target x value of 0.3, 0.35, and 0.4. The sputtering procedure, parameters, and system were modified to optimize film characteristics. Higher substrate temperature (270°C) was required to obtain metallic gray films with x>0.3. With substrate temperatures less than 270°C and deposition rates 0.5-1.0 micron per hour the films were …