This thesis describes the design of a Reduced Instruction Set Computer. Its instruction memory utilizes a unique cache architecture and a two-stage memory pipelining technique. Because of the bandwidth of the 64-bit instruction bus, instruction prefetching is possible and is implemented. The data memory is bridged by a four-way set-associative...
Increasing automation and highly flexible manufacturing processes cause increasing complexity for manufacturing system. FMS (Flexible Manufacturing System) is an approach to solve this problem. Since the elements of the FMS and manufacturing process performance are closely interrelated, the application of simple modeling and emulation techniques in the planning stages for...
The new CMOS folded source-coupled logic (FSCL)
technique intended for mixed-mode integrated circuits has
been designed. It has advantages over conventional CMOS
circuit in terms of reduced current spike, circuit delay,
logic flexibility, and layout density. A simple CPU
implemented in 2 μm CMOS technology with a 5.0 volt supply...
GaAs MESFETs are widely used in high speed integrated circuits (ICs) and
microwave circuits. Due to the materials and processing methods used in GaAs
MESFET fabrication, deep level traps in the substrate materials have a strong influence
on device performance.
In this work we used the drain current transient characterization...
Digitally-programmable filters have been an ongoing research topic for a number of years. The first such filters were FIR transversal filters using Charge-Coupled Devices (CCD's) and IIR recursive filters using switched-capacitor (SC) techniques. Although both techniques achieve excellent results, they require non-standard and/or additional IC fabrication steps. Low substrate doping...
The objective of this thesis is to present the architecture and
design of a neural network-based pattern classifier. The classifier
detects textual characters which have been translated, rotated, and
corrupted by noise. This form of pattern classifier differs
significantly from traditional pattern classifiers. The neural network
architecture used in implementing...
Advances in VLSI array processing have led to many new
parallel structures for real-time Digital Signal Processing (DSP)
applications. Among all the architectures, systolic arrays have played
an important role because systolic arrays have regular, local
interconnections with modular structure. In ordinary systolic arrays,
however, all processing operations and data...
A numerical technique to compute the time domain response of multiconductor lossy
uniform and nonuniform lines terminated in general nonlinear elements is presented. The
technique is based on the generalized method of characteristics. The method transforms the
original system of transmission line equations into a system of ordinary differential
equations....
A recorded image is a degraded version of an original image.
The process of removing the degradations is called restoration. Two
types of degradations are considered in this thesis: namely, linear
motion and defocused lens blurrings. Using the direct deconvolution
technique to restore blurred images is impossible if the blurring...
In recent years, the new integrated circuit technology has spawned the
development of many low cost high performance microcontrollers. With the
improvement in the processor speed, instruction sets, and memory capacities,
these microcontrollers are ideal for the implementation of Control-Oriented
Local Area Networks (COLAN) for real-time distributed control systems. The...
It has become customary in electrical engineering to think of
signal processing in terms of voltage variables to the exclusion of
current variables. This tendency has resulted in voltage signal
processing circuits such as voltage-controlled voltage sources
(VCVS) and voltage-mode operational amplifiers. However, the VCVS
operational amplifier has several limitations...
As hardware becomes cheaper and cheaper, there is an
increasing interest in the implementation of distributed control
networks with microcontrollers. Such networks are usually
inexpensive and of high performance.
In this thesis work, a low-cost display control unit for COLAN, a
control-oriented network, is designed. The system is based on...
Disk space fragmentation is the proliferation of small and
unusable gaps. This problem is considered within the context of
IBM's VM operating system.
Facing this problem, researchers resorted to using algorithms
based on memory management techniques, such as placement
strategies (first-fit, best-fit, and worst-fit). Solutions based on these
algorithms do...
Split and normal gate A1GaAs /GaAs MODFETs were fabricated along with
the ohmic test structures and the Hall bar geometries. The DC characteristics of
normal gate transistors were evaluated at room temperature and at 77K and the
threshold voltages were extracted from the measurements and compared to the
theoretical results....
This thesis work researches the theory and application
of systems performing omnidirectional, non-direct
path optical data communication (ONP systems). Such
systems are characterized by 1) the communication involves
a local, usually circular area; 2) Obstacles are allowed
between a transmitter and the receivers. This is in
contrast to the point-to-point...
The exceptional feature of the brushless doubly-fed
machine is the lack of need for frequent replacement of
brushes. The inherent instability of this machine has to be
overcome for its application in adjustable speed drives and
variable speed generation systems.
Specific objectives were:
to study the characteristics of the machine...
An improved robot manipulator decentralized non-linear adaptive
controller that performs well in the presence of disturbances with
unknown parameters and non-linearities is presented in this work.
The proposed decentralized adaptive structure is a modification of
the controller developed by Seraji [13-17] and is characterized by an
auxiliary signal that compensates...
An adaptive pitch axis autopilot design procedure is presented. The
design procedure is applicable to both stable and unstable pitch axis models
and to those having nonminimum phase. The design approach assumes
the adaptive autopilot is activated after achieving level flight. It is shown a
rate-feedback compensator can be designed...
In this dissertation, two important current mode circuit design subjects have
been explored. In the first part, the switched-current circuit technique has been
investigated. The fundamental performance and limitations of this technique are
explored. One of the major limitations, the signal distortion caused by clock
feedthrough has been substantially reduced...
Coplanar microstrip structures placed on dielectric substrates
are used as high frequency electro-optic modulators. The method of
lines, a mathematical technique for solving partial differential
equations, has been applied to solve for the propagation
characteristics of such a configuration.
It has been determined that simple transmission line models
are adequate...
This thesis covers the efforts of the design, analysis,
characteristics, and construction of a Linear Brush less Doubly-Fed
Machine (LBDFM), as well as the results of the investigations and
comparison with its actual prototype.
In recent years, attempts to develop new means of high-speed,
efficient transportation have led to considerable...
An electro-dynamic Magnetic Levitation vehicular system has been
modelled and studied. In practice, a MagLev vehicle will consist of a
number of cars which are mechanically coupled to each other. It is
reasonable to assume that each of these cars will be independently
controlled with the help of a supervisory...
Computers using the tagged-token dataflow model are among the best candidates for delivering extremely high levels of performance required in the future. Instruction scheduling in these computers is determined by associatively matching data-bearing tokens in a Waiting-Matching Unit (W-M unit). At the W-M unit, incoming tokens with matching contexts are...
The problem of the restoration of quadratically
distorted images is considered in this investigation, based
upon the fact that images formed by partially coherent
illuminations are related quadratically to the amplitude of
the object. Two of the most important problems in image
restoration are: 1) determining the degradation
characteristics of...
A brushless doubly-fed machine (BDFM) is a single-frame, self-cascaded
induction machine capable of operating in both the induction
and the synchronous modes. This thesis presents some important
advances concerning dynamic modeling, simulation and analysis of the
BDFM.
Initially, a two-axis model and its associated parameters are developed
and calculated. The...
A foundation for the control of tumors is presented,
based upon the formulation of a realistic, knowledge-based
mathematical model of the interaction between tumor cells
and the immune system. The parametric control variables
relevant to the latest experimental data, e.g., the sigmoidal
dose-response relationship and Michaelis-Menten dynamics,
are also considered....
A complete Gallium Arsenide Metal Semiconconductor
Field Effect Transistor (GaAs MESFET) model including deep-level
trap effects has been developed, which is far more
accurate than previous equivalent circuit models, for high-speed
applications in linear integrated circuit design.
A new self-backgating GaAs MESFET model, which can
simulate low frequency anomalies, is...
High speed photodetectors are a necessary element in
broad band digital and analog optical communication systems.
In this thesis easily integrable planar high speed
photodetectors made on undoped semi-insulating (SI) GaAs
substrates are modeled and tested. The fabrication process
of the detectors is fully compatible with GaAs
metal-semiconductor field effect...
Oversampled data converters are becoming increasingly popular
for high-precision data conversion. There have been many
publications on oversampled analog-to-digital (A/D) converters but
relatively few on oversampled digital-to-analog (D/A) converters.
In this thesis, issues concerning the analysis and design of the
oversampled D/A converters are addressed. Simulation tools and
analytical methods...
Generalized modal analysis techniques for the characterization and modeling of dissipationless planar waveguide structures and discontinuities encountered in microwave and optical integrated circuits, as well as of quantum waveguide structures and devices, are presented. The frequency-dependent transmission properties of the curved microstrip bend are derived by utilizing a second-order perturbation...
This thesis presents an adaptive model reference controller for a highly
maneuverable high performance aircraft, in particular, a modified F18. An adaptive
controller is developed to maneuver an aircraft at a high angle of attack. Thus, the
aircraft is required to fly over a highly nonlinear flight regime. The adaptive...
In this paper, an analysis of the clock-feedthrough effects in
switched-current (SI)' circuits will be presented. The clock-feedthrough
effects caused by the non-ideal characteristic of MOS
switches when they are turned off limit the accuracy of the analog
track-and-hold (T/H) circuits. A model to analyze and characterize this
effect is...
This thesis describes the development of a flash analog-to-digital converter based on
current-mode technique. The advantages of current -mode technique are higher speed,
smaller chip area, and simple division of reference current based on current mirror. A
current-mode comparator is designed consisting of a cascode current mirror and a
current...
Environmental concerns have renewed the interest in electric vehicles. To gain
widespread use, electric vehicles will also have to offer good performance and be
reasonably priced. AC drive systems using modern semiconductors can provide
efficient operation at the required power levels, but their cost at present is still too
high....
In recent years, considerable attention has been focused on the application of
orthogonal expansions to system analysis, parameter identification, model reduction
and control system design. However, little research has been done in applying their
useful properties to Power System analysis and control. This research attempts to
make some inroads in...
Many systematic methods exist for mapping algorithms to processor arrays. The algorithm is usually specified as a set of recurrence equations, and the processor arrays are synthesized by finding timing and allocation functions which transform index points in the recurrences into points in a space-time domain. The problem of scheduling...
The parallelization and vectorization of Monte Carlo algorithms for modelling
charge transport in semiconductor devices are considered. The standard ensemble
Monte Carlo simulation of a three parabolic band model for GaAs is first
presented as partial verification of the simulation. The model includes scattering
due to acoustic, polar-optical and intervalley...
The propagation characteristics of a new coupled fin line structure, with
asymetrical, rectangular, top and bottom housings, is evaluated by using the modal
analysis technique. The boundary Green's function of the structure, relating the surface
currents to the electric fields is derived by using this technique. The propagation
characteristics, i.e....
Fully efficient systolic arrays for the solution of Toeplitz
matrices using Schur algorithm [1] have been obtained. By applying
clustering mapping method [2], the complexity of the algorithm is
0(n) and it requires n/2 processing elements as opposed to n
processing elements developed elsewhere [1].
The motivation of this thesis...
Mercury cadmium telluride is important in the detection
of electromagnetic radiation in the eight to twelve micron
atmospheric window for infrared imaging systems. High
resolution infrared imaging systems use either large (256x256
element to 1024x1024 element) staring arrays or much smaller
(1-6 element) scanned arrays in which the image is...
A study of deep levels of the emitter region of a
heterojunction bipolar transistor is investigated using deep
level transient spectroscopy (DLTS), deep level admittance
spectroscopy (DLAS), thermally stimulated capacitance
(TSCAP), and capacitance-voltage (C-V) profiling. The DX
center, with an activation energy of 0.45 eV, is the only
deep level...
With the advancement of technology, submicron CMOSonly process is available now for
Application Specific Integrated Circuits (ASICs). The high integration leads to the need for
high pin counts. However voltage supply and ground bounce due to many output drivers
switching at the same time is becoming a major problem. In...