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Proceedings of the 33rd Midwest Symposium on Circuits and Systems

12-14 Aug. 1990

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  • Proceedings of the 33rd Midwest Symposium on Circuits and Systems (Cat. No.90CH2819-1)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (45 KB)
    Freely Available from IEEE
  • A knowledge engineering tool for load forecasting

    Publication Year: 1990, Page(s):144 - 147 vol.1
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (365 KB)

    A description is given of a knowledge engineering tool for short-term load forecasting to be used as an aid in operation and planning of a distribution system. This engineering tool is composed of two parts. First, an artificial neural network is trained to produce the first evaluation of a forecasted load. Then, a fuzzy expert system manipulates actual and forecasted values of real power and weat... View full abstract»

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  • On the statistical modelling of robot manipulators

    Publication Year: 1990, Page(s):942 - 945 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    An approach to the modeling of robot manipulators is presented. Usually, system descriptions are based on a set of differential equations which, due to their nature, lead to very precise results and strategies but, in general, require laborious computations. This motivates the need of alternative methods based on other mathematical concepts. The proposed statistical model gives clear guidelines to... View full abstract»

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  • A note on discretization of continuous time standard and nonstandard singularly perturbed systems

    Publication Year: 1990, Page(s):527 - 529 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    A study is made of the effect of signal processing on both standard and nonstandard systems. It is shown that a nonstandard discrete model will never result from a discretization process, and in essence this process will alleviate this deficiency while preserving the two-time-scale (TTS) property of the discrete model. The sampling interval T is the key to preservation. Conditions are given in ord... View full abstract»

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  • Multivariable system design and optimization using root locus method

    Publication Year: 1990, Page(s):523 - 526 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    A description is presented of multivariable system design and optimization to achieve the required time domain response. The approach is based on minimization of the goal function obtained from the system root locus algebraic equation. When the system structure is obtained further optimization can be achieved minimizing the sum of squared differences between the corresponding coefficients of two c... View full abstract»

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  • Optimal control for large-scale singularly perturbed systems

    Publication Year: 1990, Page(s):519 - 522 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    A large-scale interconnected linear shift-invariant discrete-time system possessing the two-time-scale property is considered. A near-optimal solution is found using singular perturbation theory. The controllers for local subsystems are designed such that not only a given cost functional for each local subsystem is minimized but also the sensitivity of the interconnected system with respect to an ... View full abstract»

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  • A new class of median/mean based filters

    Publication Year: 1990, Page(s):449 - 452 vol.1
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A new class of nonlinear filters which combines the thresholding operation with a median or mean filter is introduced. A simple but robust method to generate thresholds is proposed. Based on it, the new filters are analyzed for their white noise attenuation and abilities to eliminate impulse noise and preserve edges. Results are compared to those of the median, FIR median hybrid (FMH), and mean fi... View full abstract»

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  • `Wireless Bimboards'-the use of programmable gate arrays in a logic design laboratory

    Publication Year: 1990, Page(s):516 - 518 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The results of converting a digital electronic laboratory using 74 chips wired on IC layout boards, to Xilinx(R) logic cell array (LCA) programmable gate arrays, are described. The LCAs expose students to modern ASIC implementation methods and consume less student time for wiring and noneducational debugging. However, to realize these benefits, one should be prepared for significant start-up costs... View full abstract»

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  • Closed form solutions for voltage pulse response of open, shorted and loaded distributed RC thin film structure

    Publication Year: 1990, Page(s):305 - 308 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    The authors present closed form solutions of uniformly distributed open, shorted and loaded RC thin film structure, for voltage pulse response, using a bisection technique, Laplace transformation, Heaviside theorem and contour integration algorithms. The voltage and current transient responses are plotted for different normalized load, time and pulsewidth parameters. Verification of the loaded sol... View full abstract»

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  • Carrier-based PWM techniques using stepped waveforms

    Publication Year: 1990, Page(s):1111 - 1114 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    A description is given of several stepped reference waveforms that can be used in carrier-based three-phase PWM at any given carrier frequency and fundamental voltage. The load current distortion factor is used to compare the performance of the various reference signals. Stepped reference waveforms are shown to be an effective way of minimizing the current distortion at all carrier frequencies and... View full abstract»

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  • New approaches for designing minimum loss wide phase range digital phase shifters

    Publication Year: 1990, Page(s):346 - 349 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Four different circuit configurations are proposed to design 0°-360° wide range, low loss, loss balanced phase shifters. Each configuration utilizes 3 p-i-n diodes. As a consequence of this work, 180 degree phase shifting cells for multibit phase array antenna systems using 3 p-i-n diodes can be constructed in a straightforward manner. Operation of the new circuits is based upon the phase ... View full abstract»

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  • A general analysis for obtaining Chebyshev polynomial coefficients

    Publication Year: 1990, Page(s):703 - 706 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    A general analysis for obtaining Chebyshev polynomial coefficients is presented. The expressions required for an order up to n=5 have been obtained. The recursive nature of the analysis enables the designer to get the expressions required for any order n. This work is intended for applications in microwave transistor amplifiers, but it may find applications in other fields of ele... View full abstract»

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  • A fast adaptive equalizer structure for voiceband communication link

    Publication Year: 1990, Page(s):5 - 8 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    A new equalizer structure that speeds up the convergence rate of the decision feedback equalizer (DFE) is presented. It consists of a prefilter, a feedforward filter and an error prediction filter. The prefilter shapes the spectral density of the received data in order to reduce the eigenvalue spread. The feedforward filter equalizes the channel distortion. The error prediction filter cancels inte... View full abstract»

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  • Bit-level designer's assistant-a knowledge based approach to systolic processor design

    Publication Year: 1990, Page(s):1001 - 1004 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A knowledge-based system for the design of high-performance bit-level systolic arrays in VLSI is described. The design objectives are to give users an extensible system, where tutorial help is available through elaborate explanation facilities and to act as an input specification tool. An expert system shell has been used to create the knowledge base View full abstract»

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  • Relation between pole assignment and optimal output feedback

    Publication Year: 1990, Page(s):47 - 49 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    Using output feedback, the authors demonstrate a connection between pole assignment technique and optimal output feedback. There exist common Lyapunov functions relating two closed-loop systems synthesized by each method. From this property, they derive a theorem that makes it possible to relocate the poles optimally using pole assignment View full abstract»

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  • The use of derivatives in the inversion of continued fraction expansions of transfer functions of multidimensional systems

    Publication Year: 1990, Page(s):445 - 448 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    It is shown that the inversion of continued fraction expansion of transfer functions of multidimensional systems can be carried out by the use of derivatives or equivalently using simple graphs. Only one parameter of the transfer function need be evaluated first. The remaining parameters are obtained as partial derivatives of this parameter. Based on these evaluations, the transfer function is obt... View full abstract»

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  • PC programs for circuit and system design and analysis

    Publication Year: 1990, Page(s):512 - 515 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A description is given of the development of PC programs which can be used in circuit and system design and analysis. The approach used is a general one which can be readily applied to many electrical engineering areas. Examples of the programs are included View full abstract»

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  • Generalized spectral transformations for the approximation of even order elliptic filters

    Publication Year: 1990, Page(s):301 - 304 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    An extension of Darlington's (1978) algorithm to obtain even order class B and C elliptic filter functions is described. The results agree very well with those produced by other methods but the computational complexity is greatly reduced. The complete algorithm is amenable for microcomputer or pocket programmable calculator implementation View full abstract»

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  • Large-signal control of a bidirectional coupled-inductor Cuk converter via pseudolinearization

    Publication Year: 1990, Page(s):1107 - 1110 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The analysis and design of a nonlinearly controlled Cuk converter with magnetic coupling between inductors is presented. The nonlinear control is derived via pseudolinearization, providing a perturbed average model which is independent of the operating point exhibiting a linear structure in Brunovsky's canonical form. As a result, the output variable follows proportionally a reference signal, allo... View full abstract»

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  • Expert search in neural network optimization

    Publication Year: 1990, Page(s):29 - 32 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Recent research has shown that many optimization problems can be solved using artificial neural networks (ANN). The primary problem encountered in finding the globally optimal solution is the existence of local minima. The approach taken in this research is to develop a constrained optimization strategy using the observed data during adaptation or search. The constraints are rigidly enforced by an... View full abstract»

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  • Typical applications of new generation spreadsheets to power system problems

    Publication Year: 1990, Page(s):159 - 162 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    This work presents advanced applications of a popular new generation spreadsheet, Lotus 1-2-3 (Release 2 or higher), to core power system problems developed in the context of the Power Engineering Curriculum at the University of Calgary. Specifically, the authors describe application programs using the built-in spreadsheet functions, macro commands, and the Lotus Command Language (LCL), for the fo... View full abstract»

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  • The loaded line phase shifter-a rigorous approach

    Publication Year: 1990, Page(s):343 - 345 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    A detailed description is given of a rigorous procedure that incorporates both lossy and imperfectly matched diodes. As an example, it is shown how to choose the values of the design parameters of a phase reflection modulator, an important component in the imbedding networks. Simple design equations are derived which include mismatched and lossy diode characteristics. These are developed using the... View full abstract»

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  • Theoretical dielectric loss effects in superconducting transmission lines

    Publication Year: 1990, Page(s):699 - 702 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The author proposes a method based on a Fourier cosine Series approximation, using frequency as the variable. The series can fit the frequency-dependent resistance or conductance per unit length, automatically providing a sine series approximation to the frequency-dependent capacitive susceptance per unit length. The advantage of using a cosine series is that the coefficients are easily computed. ... View full abstract»

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  • A high-speed high-resolution floating-point data acquisition system

    Publication Year: 1990, Page(s):740 - 743 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    This acquisition system is designed and built as a plug-in circuit board for IBM AT, PS/2, and compatibles. It is configured either as a 16 single-ended or 8 differential input channel system, with up to 20-bit conversion resolution potential. It can process the data at a rate up to 100 kHz. The software package includes commands needed for the system initiation, automatic or 9 software programmab... View full abstract»

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  • Adaptive recursive state-space filtering

    Publication Year: 1990, Page(s):1 - 4 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The least-mean-square adaptation algorithm is extended to state-space recursive filtering in order to obtain improved adaptive filter structures and take advantage of the better numerical performance of state-space filtering. The gradients for the parameters are derived directly from the state equations and formulated by matrix derivative linear operations. Simulation results showing that the adap... View full abstract»

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