UScholar Works
 
Filters: Department: "Electrical & Computer Engineering" Collection: "ir_uspace"
201 - 225 of 577
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CreatorTitleDescriptionSubjectDate
201 Stevens, KennethTotal ionizing dose characterization of a commercially fabricated asynchronous FFT for space applicationsThe total ionizing dose characterization of the radiation-hardened implementation of a novel architecture for high-performance, energy efficiency FFT engines is presented. Simulations and test chip measurement results indicate that a radiation-tolerant 1024-point FFT based on this architecture will...2000
202 Tasdizen, TolgaImproving the stability of algebraic curves for applicationsAn algebraic curve is defined as the zero set of a polynomial in two variables. Algebraic curves are practical for modeling shapes much more complicated than conics or superquadrics. The main drawback in representing shapes by algebraic curves has been the lack of repeatability in fitting algebraic...2000
203 Myers, Chris J.; Gopalakrishnan, GaneshAchieving fast and exact hazard-free logic minimization of extended burst-mode gC finite state machinesAbstract This paper presents a new approach to two-level hazard-free logic minimization in the context of extended burst-mode finite state machine synthesis targeting generalized C-elements (gC). No currently available minimizers for literal-exact two-level hazard-free logic minimization of extende...2000
204 Mathews, V. JohnImage enhancement via adaptive unsharp maskingAbstract-This paper presents a new method for unsharp masking for contrast enhancement of images. Our approach employs an adaptive filter that controls the contribution of the sharpening path in such a way that contrast enhancement occurs in high detail areas and little or no image sharpening occur...2000
205 Myers, Chris J.Automatic abstraction for synthesis and verification of deterministic timed systemsThis paper presents a new approach for synthesis and verification of asynchronous circuits by using abstraction. It attacks the state explosion problem by avoiding the generation of a flat state space for the whole design. Instead, it breaks the design into sub-blocks and conducts synthesis and veri...2000
206 Stevens, KennethFsimac: a fault simulator for asynchronous sequential circuitsAt very high frequencies, the major potential of asynchronous circuits is absence of clock skew and, through that, better exploitation of relative timing relations. This paper presents Fsimac, a gate-level fault simulator for stuck-at and gate-delay faults in asynchronous sequential circuits. Fsimac...2000
207 Furse, Cynthia M.Faster than fourier: ultra-efficient time-to-frequency-domain conversions for FDTD simulationsThis tutorial compares several methods of converting from the time to the frequency domain for FDTD simulations. Applications include calculations of field or power distributions, antenna impedance, and radiation patterns. The traditional Fourier transform methods are compared to two methods based o...FDTD simulations; FDTD methods; Finite-difference time-domain; Computation time; Frequency domain analysis; Time domain analysis; Discrete Fourier transform2000-01-01
208 Harrison, Reid R.Eyes and ears: combining sensory motor systems modelled on insect physiologyIntegrating sensorimotor systems is still a difficult problems for robotics. Biological inspiration, which has been effectively used to address single sensorimotor tasks, could also be applied to this problem. Several studies on the cricket suggest that it integrates an optomotor response to two exi...2000-01-01
209 Harrison, Reid R.Floating-gate PFET-based CMOS programmable analog memory cell arrayThe complexity of analog VLSI systems is often limited by the number of pins on a chip rather than by the die area. Currently, many analog parameters and biases are stored off chip. Moving parameter storage on chip could save pins and allow us to create complex programmable analog systems. In this ...2000-01-01
210 Furse, Cynthia M.; Christensen, Douglas A.Problem and treatment of DC offsets in FDTD simulationsThis paper discusses the causes of and some solutions to the commonly observed problem of dc field offsets in finite-difference time-domain (FDTD) simulations. DC electric and magnetic field offsets are shown to be valid calculated responses of the modeled systems, resulting from interaction betwee...FDTD simulations; Finite-difference time-domain; DC offsets2000-01-01
211 Harrison, Reid R.Silicon implementation of the fly's optomotor control systemFlies are capable of stabilizing their body during free flight by using visual motion information to estimate self-rotation. We have built a hardware model of this optomotor control system in a standard CMOS VLSI process. The result is a small, low-power chip that receives input directly from the r...Optomotor control system; photoreceptors; Insect visual system; Motion detector; CMOS transistor2000-01-01
212 Stringfellow, Gerald B.; Shurtleff, James KevinUse of surfactant Sb to induce triple period ordering in GaInPA surfactant is used to induce an ordered structure in an epitaxial layer. The addition of small amounts of triethylantimony during the organometallic vapor phase epitaxy growth of GaInP on 001 GaAs substrates is shown to remove CuPt ordering with a resultant increase in band gap energy. Increasi...Organometallic; Thermodynamics; Surfactant2000-03-13
213 Furse, Cynthia M.Prof. James R. wait and mining production technology--an appreciationProf. James R. Wait examined electromagnetic (EM) wave propagation in many situations of interest to mining production, including propagation in tunnels, propagation along extended conductors such as cables and drill stems, and propagation in coal seams. This work remains relevant, both to the mini...James R. Wait; Electromagnetic wave propagation; Geologic measurements; Mining industry2000-09
214 Stringfellow, Gerald B.Spectroscopic study of surfactant enhanced organometallic vapor phase epitaxy growth of GaInPSamplen s of GaxIn1-xP grown by organometallic vapor phase epitaxy on (001) GaAs substrates by addition of TESb demonstrating a lateral superlattice compositional modulation (CM) have been studied by low temperature polarized photoluminescence (PL), power dependent PL, and photoluminescence excitati...Organometallic vapor; Photoluminescence excitation; Spectroscopy2001
215 Stevens, KennethCongruent weak conformanceCongruent weak conformance is a property between formal models capturing the desired relationship between a specification and its implementation by allowing unused and redundant circuitry and tolerating unspec4jied behavior in the unreachable state space. By providing greater flexibility in design t...2001
216 Myers, Chris J.; Stevens, KennethAn asynchronous instruction length decoderAbstract-This paper describes an investigation of potential advantages and pitfalls of applying an asynchronous design methodology to an advanced microprocessor architecture. A prototype complex instruction set length decoding and steering unit was implemented using self-timed circuits. [The Revolvi...2001
217 Stringfellow, Gerald B.Kinetics of Te doping in disordering GaInP grown by organometallic vapor phase epitaxyTe-doped GaInP epitaxial layers were grown by organometallic vapor phase epitaxy in an effort to clarify the Te disordering mechanism. CuPt ordered GaInP is produced under normal growth conditions. The addition of Te has been reported to induce disorder. One suggested mechanism for disordering GaInP...Crystal growth; Epitaxy; Dynamics2001
218 Myers, Chris J.A standard-cell self-timed multiplier for energy and area critical synchronous systemsThis paper describes the design of a standard-cell self-timed multiplier for use in energy and area critical synchronous systems. The area of this multiplier is bounded by N rather than N2 as seen in more traditional combinational parallel array designs, where N is the word size. Energy has a polyn...2001
219 Myers, Chris J.Timed circuit verification using TEL structuresAbstract-Recent design examples have shown that significant performance gains are realized when circuit designers are allowed to make aggressive timing assumptions. Circuit correctness in these aggressive styles is highly timing dependent and, in industry, they are typically designed by hand. In ord...2001
220 Myers, Chris J.Efficient exact two-level hazard-free logic minimizationAbstract This paper presents a new approach to two-level hazard-free sum-of-products logic minimization. No currently available minimizers for single-output literal-exact two-level hazard-free logic minimization can handle large circuits without synthesis times ranging up over thousands of seconds....2001
221 Myers, Chris J.Analog decoding of product codesA design approach is presented for soft-decision decoding of block product codes ("block turbo codes") using analog computation with MOS devices. Application of analog decoding to large code sizes is also considered with the introduction of serial analog interfaces and pipeline schedules.2001
222 Stringfellow, Gerald B.Sb enhancement of lateral superlattice formation in GaInPEpitaxial layers of GaInP were grown by organometallic vapor phase epitaxy with small amounts of TESb added to control the surface bonding. Above a concentration of Sb/III(v)=0.016, 12 K photoluminescence measurements show that the band gap is reduced, as compared to completely disordered GaInP, by ...Tin; Epitaxy; Photoluminescence2001
223 Mathews, V. JohnAn adaptive channel estimator for CDMA systems in multipath fading channelsABSTRACT CDMA systems in multipath fading channels need to estimate channel parameters for coherent detection of the transmitted signals. In this paper we present a simple but effective channel estimation algorithm that can be incorporated into most types of multiuser receivers to obtain good dete...2001
224 Myers, Chris J.; Schlegel, ChristianAnalog MAP decoder for (8, 4) hamming code in subthreshold CMOSAn all-MOS analog implementation of a MAP decoder is presented for the (8, 4) extended Hamming code. This paper describes the design and analysis of a tail-biting trellis decoder implementation using subthreshold CMOS devices. A VLSI test chip has recently returned from fabrication, and preliminary ...2001
225 Mathews, V. JohnBlind identification of bilinear systemsAbstract This paper is concerned with the blind identification of bilinear systems excited by higher-order white noise. Unlike prior work that restricted the bilinear system model to simple forms and required the excitation to be Gaussian distributed, the results of this paper are applicable to a m...2001
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