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SoutheastCon, 2005. Proceedings. IEEE

Date 8-10 April 2005

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Displaying Results 1 - 25 of 135
  • Proceedings of the IEEE SoutheastCon 2005 (IEEE Cat. No.05CH37624)

    Publication Year: 2005
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  • Proceedings of the IEEE Southeastcon 2005

    Publication Year: 2005 , Page(s): i
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  • Copyright page

    Publication Year: 2005 , Page(s): ii
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  • Table of contents

    Publication Year: 2005 , Page(s): iii - xii
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  • Planning Committee members

    Publication Year: 2005 , Page(s): xiii
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  • Track chairs

    Publication Year: 2005 , Page(s): xiv
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  • Referees

    Publication Year: 2005 , Page(s): xv
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  • General chair

    Publication Year: 2005 , Page(s): xvi
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  • Message from the SoutheastCon 2005 technical/proceeding program chair

    Publication Year: 2005 , Page(s): xvii
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  • [Breaker page]

    Publication Year: 2005 , Page(s): 1 - 4
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  • Fuzzy adaptation of the PI controller parameters applied for induction motor

    Publication Year: 2005 , Page(s): 5 - 10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1810 KB) |  | HTML iconHTML  

    Several works have studied the use of fuzzy logic, confirming that classical controllers, compared to fuzzy controllers, have the advantages of very short time of execution and mathematical precision. However, classical controllers have a certain limitation when rather significant variations of disturbance factors act on the system to be controlled. The classical controller does not always react in an optimal way. Thus, the abilities of adaptation and robustness of this controller are limited. An adaptation mechanism (supervisor) for the PI gain is proposed, allowing improvement of the classical controller, by introducing a certain degree of intelligence in the control strategy of the controller. Indeed, this approach of associating the PI controller with a supervisor composed of fuzzy rules, offers the possibility of using the mathematical accuracy of the PI algorithm with the adaptability, the flexibility and the simplicity of the fuzzy linguistic formalism. View full abstract»

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  • A generic AHB bus for implementing high-speed locally synchronous islands

    Publication Year: 2005 , Page(s): 11 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1842 KB) |  | HTML iconHTML  

    Platform-based design requires flexibility and compatibility between components in order to design derivative applications without changing hardware or software. Several solutions are available, but they lack either the necessary throughput or flexibility. The paper proposes a generic multi-frequency interconnection infrastructure module that facilitates development of flexible on-chip high-performance buses. It is based on the AMBA high-speed bus (AHB). The proposed architecture has been implemented with the HDL Designer environment and laid out as a 0.18 μm CMOS module using Synopsys tools to validate the proposed concepts. View full abstract»

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  • Electrical characterization of GaN based blue light emitting diodes

    Publication Year: 2005 , Page(s): 17 - 22
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1869 KB) |  | HTML iconHTML  

    Blue light emitting diodes (LEDs), based on an AlGaN/GaN/AlGaN double heterojunction structure, have been electrically characterized. These diodes are highly non-ideal with several approximately linear regimes in the semi-logarithmic plots of the forward characteristics. Calculated values of the ideality factor range from 3.0-7.0, indicating that the recombination process in these diodes cannot be conveniently described by the Shockley-Read-Hall statistics. Logarithmic plots of the forward characteristics indicate a space-charge-limited-current (SCLC) conduction through the active region of the diodes. Observed changes in the slope of these logarithmic plots are representative of a high density of "deep-level states" in the active region of the diodes. An analysis of these characteristics yielded an approximate density of deep-level states of 2×1017/cm3. These states are most likely located close to the valence band edge, in the compensated active region of the diodes. View full abstract»

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  • LabVIEW-based position control system with synchro [radio telescope control application]

    Publication Year: 2005 , Page(s): 23 - 28
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1806 KB) |  | HTML iconHTML  

    A closed-loop DC motor position control system is investigated that allows a radio telescope to be accessed and controlled via the Internet. The project involves the use of LabVIEW to provide a low-cost solution. In addition, it employs a data acquisition board (DAQ) and data acquisition accessory board which is a multifunction I/O device having two 8 bit digital I/O lines, 16×12 bit single ended analog inputs and two 12 bit analog output lines. The motor position information is obtained from a synchro mounted on the shaft of the motor. The synchro output is measured, interpreted and appropriate control signals are generated by the LabVIEW program. The data transfer to and from the computer is conducted via the DAQ's input and output ports respectively. The system is tested in the laboratory set-up for different angular displacements and initial positions of the motor. Initial results are found to be satisfactory. View full abstract»

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  • VLSI implementations of switched-capacitor filter

    Publication Year: 2005 , Page(s): 29 - 33
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1779 KB) |  | HTML iconHTML  

    This paper presents efficient designs and implementations of switched-capacitor (SC) filters. We design two switched-capacitor filters, with a 6 MHz bandwidth and an input sampling frequency of 13.5 MHz, using 0.35 μm CMOS technology (Vtn=0.56 V, Vtp=-0.77 V, Vdd=1.65 V, V=-1.65 V). We considered several approaches to design SC filters, and implemented two circuits suitable for video applications. The first filter is designed using a switched-capacitor integrator with an inductor, which achieves a bandwidth of 0.25 MHz to 6.25 MHz with a center frequency of 1.7 MHz. The switched-capacitor integrator with an inductor has a good pass-band gain but a high center frequency. The second circuit is designed using a multiple feedback band-pass filter, which achieves a bandwidth of 0.25 MHz to 6.25 MHz with a center frequency of 1.27 MHz. The advantage of the multiple feedback band-pass filter design is the low center frequency over specified bandwidth but a poor pass-band gain. The two designed SC filters require less area and consume less power. View full abstract»

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  • A fast algorithm for frequency estimation of power systems in colored noises

    Publication Year: 2005 , Page(s): 34 - 38
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1775 KB) |  | HTML iconHTML  

    A technique for tracking the frequency of power systems in sine noises using numerical differentiation is presented in this paper. A voltage or current sinusoidal signal corrupted by a sine noise with the frequency varying from 0 to 300 Hz, the amplitude varying from 0 to 300 V, and the phase angle varying from 0 to 360 degree is taken into consideration. Using central numerical differentiation with 7 points, the proposed algorithm shows more advantage in time and speed compared with other existing techniques, and shows better dynamics and high accuracy infrequency estimation. The simulation results of a test example carried out in Matlab are satisfactory. View full abstract»

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  • Understanding the PRBS signal as an optimum input signal in the wavelet-correlation method of system identification using multiresolution analysis

    Publication Year: 2005 , Page(s): 39 - 44
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1776 KB) |  | HTML iconHTML  

    This paper will focus on the relationship between the pseudo-random binary sequence (PRBS) signal and the dyadic lattice. A method for estimating the PRBS function by a series of Haar wavelets is derived and explained. Relating the PRBS signal to the Haar wavelet is advantageous because the Haar wavelet forms an orthonormal wavelet basis. Multiresolution analysis is used to write the PRBS signal as a finite series of Haar wavelets, and the dyadic period of the PRBS signal is exploited to make this task easier. The PRBS signal and dyadic lattice are shown to be complimentary choices for the wavelet-correlation (W-C) method. View full abstract»

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  • A comparative study of the effects of CH4/H2 versus CO/H2 gas mixture on the quality of CVD diamond films deposited on silicon substrates

    Publication Year: 2005 , Page(s): 45 - 48
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2157 KB) |  | HTML iconHTML  

    This paper investigates the quantifiable effects of the gas flow mixture on the structural quality of CVD diamond films. The experimental study includes two types of gas flow mixtures: (a) CH4/H2 and (b) CO/H2. All films are grown in 5" quartz dome, 3" substrate reactor. The reactor output variables, which include film morphology expressed by the growth parameter α and grain size, structural quality as measured by Raman spectra and scanning electron microscopy (SEM) techniques, linear growth rate, and carbon conversion efficiency, are examined and a complete analysis is presented in this paper. View full abstract»

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  • Energy-aware dual-rail bit-wise completion pipelined multipliers design

    Publication Year: 2005 , Page(s): 49 - 54
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1825 KB) |  | HTML iconHTML  

    Energy-awareness indicates the scalability of the system energy with changing conditions and quality requirements. Because of the encoding format and operation sequence, dual-rail encoding circuits are not naturally energy aware to the changing of input precision. A novel technique, zero insertion, to design energy-aware arithmetic circuits in dual-rail encoding logic is developed. By using s to replace the redundant data 0s in high order bits, the designed circuits have significant energy savings as well as latency reduction under different input precision probability while maintaining speed-independency. A group of parallel multipliers have been designed and simulated to demonstrate the effectiveness of this technique. The overhead and additional costs in control signal generation circuit are also discussed. View full abstract»

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  • Coupled physical modeling of power cables supplying non-linear loads using finite element method

    Publication Year: 2005 , Page(s): 55 - 59
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1850 KB) |  | HTML iconHTML  

    This paper presents a physical model of power cables connected to nonlinear loads in naval shipboard power systems. Two models were developed, finite element (FE) and abc phase variable model. The terminal behavior of the cable was investigated by coupling the finite element cable's model and external eclectic circuit simulations. The approach uses time domain techniques and the finite element method. Such a model would allow an efficient representation of the cable under different operating conditions. The abc form of the cable's model is also built. The inductances are calculated by the energy/current (E/C) perturbation method. Simulations for both a full FE model and representative phase variable model were developed. The terminal behavior comparison of FE model and abc inductance model under nonlinear load condition is performed. The significance of this physical abc model is that it would enable fast dynamic simulations while preserving accuracy. View full abstract»

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  • Harmonic analysis of induction motor flux density waveform using wavelets in speed control application

    Publication Year: 2005 , Page(s): 60 - 64
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1906 KB) |  | HTML iconHTML  

    The lack of a numerical model in the literature for harmonic analysis of the air gap flux density waveform in an induction motor speed control application, by changing pole numbers, inspires this study. One of the methods for speed control of an induction motor is to change the number of poles of the stator winding. The change in the pole numbers introduces additional harmonics in the air gap flux density waveforms which are harmful to machine performance as well as equipment connected to it. The wavelet packet transform is used to quantify the harmonics in the flux density waveform. The results are useful in the design and development of both motor and drive diagnosis systems. The originality and significance of this research is to enable researchers to choose a proper induction motor in speed control applications by changing pole numbers. View full abstract»

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  • Design and implementation of hybrid digital analog transmission system using interleaved pipelined ADC

    Publication Year: 2005 , Page(s): 65 - 70
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2023 KB) |  | HTML iconHTML  

    This paper is concerned with design and IC implementation of a time interleaved pipelined ADC augmented to provide analog error outputs. The ADC outputs are used in digital-analog hybrid coding which uses residual error voltage transmission along with digital codes in a pipelined system of special design. The fully differential design in standard 0.18 μm CMOS technology employs a 12 bit, 60 MS/s paralleled-pipelined flash ADC. Such a pipeline ADC is the best candidate for applications where digital bit stream and analog residue both can be derived for hybrid digital-analog coding. Time interleaving provides increased throughput and signals for implementing QAM when necessary. The ADC targeted for achieving a high precision RF sensor telemetry application dissipates 90 mW from a single 1.8 V supply. Special attention has been given to ensuring adequate linearity for this system.. The digital-analog baseband signals are time/frequency multiplexed when transmitted on the RF carrier. The signal is regenerated in the receiver by summing the outputs of the DAC in the digital channel and the analog signal as necessary. View full abstract»

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  • A new 0.25um CMOS on-chip active balun with gain controllability for 5GHz DCR [direct conversion receiver]

    Publication Year: 2005 , Page(s): 71 - 74
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1872 KB) |  | HTML iconHTML  

    An on-chip active balun with good gain and phase mismatch performance of within 0.5 dB and 1 degree, respectively, is presented in this paper. Applicable for direct conversion receiver circuits, the presented balun features reconfigurability in the form of controllable gain, designed to operate in the 5-6 GHz range with a bandwidth of 400 MHz. With good linearity, input/output matching and gain and with improvement in noise performance, the proposed active balun circuit could effectively be used as the first stage of an RF front end replacing the LNA. View full abstract»

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  • 100 Mbs OOK transmitter with low power and low phase noise LC VCO for neurosensory application

    Publication Year: 2005 , Page(s): 75 - 78
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2014 KB) |  | HTML iconHTML  

    A 5.7 GHz fully integrated complementary LC voltage controlled oscillator (CLC VCO) has been designed in an inexpensive 0.25-μm digital CMOS process targeting low power short reach 100 Mbs on-off keying wireless transmitter (OOK) for neurosensory application. Consuming only 2 mA of current from a 2.5 V power supply, the CLC VCO achieves a measured single-sideband phase noise of -92.75 dBc/Hz and -97.6 dBc/Hz at 600 KHz and 1.0 MHz offset frequency, respectively. The CLC VCO is able to output -5 dBm of power at the single-ended output to a 50 ohm load to meet demands of high-data rate short reach on-off keying wireless transmission. Various low power techniques used to improve phase noise in the LC VCO are also discussed. View full abstract»

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  • Adaptive IIR constrained LMS algorithm for multiple narrowband interference rejection

    Publication Year: 2005 , Page(s): 79 - 83
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1791 KB) |  | HTML iconHTML  

    One of the common problems in digital signal processing is the filtering of signals in the presence of a narrow-band interference. Adaptive IIR digital multiple hand-rejection filters use pole-zero placement on the unit circle method, which is designed by a unique second-order filter structure. With unconstrained LMS algorithm, zeroes may converge to their optimum positions in certain cases, where the poles do not converge without a forcing condition. In this paper, a new design of adaptive digital band-rejection filter, constrained least-mean-squares (CLMS), is applied by adapting both poles and zeroes for the elimination of a narrow-band white Gaussian noise. View full abstract»

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