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Circuits and Systems, 1991., Proceedings of the 34th Midwest Symposium on

Date 14-17 May 1992

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  • Proceedings of the 34th Midwest Symposium on Circuits and Systems (Cat. No.91CH3143-5)

    Publication Year: 1991
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    Freely Available from IEEE
  • Effect of lateral-field distribution on hot-carrier analysis in short-channel MOSFETs

    Publication Year: 1991, Page(s):799 - 802 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    A previously developed quasi-two-dimensional model is used to examine the effect of the lateral-field distribution in the drain region on the different components of current in short-channel MOSFETs. Uniform, linear, and parabolic distributions are included in the model for the first time. Hot-carrier currents are found to be consistent with the experimental data available in the literature when a... View full abstract»

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  • Stability robustness bounds with output feedback

    Publication Year: 1991, Page(s):928 - 930 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    Closed-loop linear time-invariant systems with output feedback are considered. Based on the Lyapunov approach, allowable linear time-invariant perturbations to the nominal system are considered and calculated to ensure stability robustness and certain performance robustness of closed-loop systems in any predeterminate region View full abstract»

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  • Chaos in four-dimensional autonomous circuits

    Publication Year: 1991, Page(s):64 - 67 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    Proposes a four-dimensional autonomous hyperchaos generator whose nonlinear element is only one diode. The circuit is analyzed by replacing the diode with an ideal switch. This simplification makes it possible to formulate the two-dimensional return map rigorously, and its Lyapunov exponents confirm that the circuit exhibits hyperchaos. Also, the simplification is discussed from mathematical point... View full abstract»

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  • Information processing by associative silicon retina

    Publication Year: 1991, Page(s):803 - 806 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The authors analyze an associative silicon retina, focusing on the relation between its structure and the error correcting capacity from the viewpoints of code and graph theories. They also investigate its applications to information processing in which image compression and reproduction, pattern recognition, and routing search are included View full abstract»

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  • Locally optimal detection of unknown signals in non-Gaussian Markov noise

    Publication Year: 1991, Page(s):1098 - 1101 vol.2
    Cited by:  Papers (9)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The authors address the application of locally optimum (LO) signal detection techniques to environments in which there is no prior knowledge of the noise density and spectral properties. Specific algorithms are introduced, and the performance of these algorithms is examined. Unlike previous algorithms, these techniques place few assumptions on the properties of the noise, and they perform well und... View full abstract»

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  • H control for singularly perturbed systems with slow inputs

    Publication Year: 1991, Page(s):931 - 933 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    H near-optimal state-feedback problem/solution is formulated for a singularly perturbed system with only slow input components. The assumption of slow inputs in the singularly perturbed system results in separated fast and slow cost functionals that contain strictly orthogonal terms. State-space methods with orthogonality restrictions are then applied to solve the ... View full abstract»

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  • Chaotic phenomena in nonlinear circuits with time-varying resistors

    Publication Year: 1991, Page(s):60 - 63 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Four simple nonlinear circuits with time-varying resistors are analyzed. These circuits are a kind of parametric excitation circuit, and chaotic attractors are observed in three circuits. In order to analyze these circuits a degeneration technique is used, that is, diodes in the circuits are assumed to operate as ideal switches. Thereby the Poincare maps are derived as one-dimensional maps and cha... View full abstract»

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  • Low sensitivity biquads based on doubly loaded LC filters

    Publication Year: 1991, Page(s):1065 - 1068 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The authors discuss the synthesis and design of filters using biquads which simulate doubly loaded maximum gain second-order LC ladders. It is shown that, for approximations with low-Q poles, biquads based on doubly loaded LC filters perform better than the classical ones. Using practically the same number of components they present considerably lower passive sensitivit... View full abstract»

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  • A diffused CMOS SRAM compiler for gate-arrays

    Publication Year: 1991, Page(s):807 - 810 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The authors present a highly configurable embedded SRAM (static random-access memory) compiler that can generate both single and dual-port diffused SRAMs. The synthesis of these RAMs does not require any engineering intervention or knowledge of SRAM design. The compiler allows one to make accuracy vs. time tradeoffs in SRAM characterization by offering three different simulation methodologies View full abstract»

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  • Applications of Motorola microcontrollers in the design of general purpose frequency synthesizers

    Publication Year: 1991, Page(s):958 - 961 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    The design of a general-purpose frequency synthesizer that synthesizes frequencies in the band of 100 Hz to 150 kHz, is accomplished using fractional phase-locked loop techniques. The method utilizes a 68HC11 microprocessor to generate very stable reference frequencies. A software program has been written to vary the reference frequency over the desired operating range. Operations at higher freque... View full abstract»

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  • Transposing a matrix without incurring additional storage

    Publication Year: 1991, Page(s):1102 - 1104 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    Transposing a rectangular matrix without incurring additional storage (i.e. transposing the matrix in place) consists of decomposing the absolute locations of the matrix into disjoint cyclic subgroups. Any element of the subgroup can be used as a primer to generate all the locations of the elements in the transposed matrix using a recursive operation or mapping to be precisely defined. The cyclic ... View full abstract»

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  • Power conversion and control using a current sensing power MOSFET

    Publication Year: 1991, Page(s):166 - 169 vol.1
    Cited by:  Papers (15)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    Current-sensing power MOSFETs (SENSEFETs) provide signals proportional to the device current which can be used for overcurrent protection and current feedback. The authors describe an experimental DC-to-DC converter using a SENSEFET switch. The method of processing the sense signal and designing the current feedback is explained. The characteristics of the current sense signal are studied for a co... View full abstract»

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  • Model reduction using balance-truncation method with lower error bounds

    Publication Year: 1991, Page(s):934 - 938 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A modified balance-truncation reduced-order model is developed by introducing a weighting factor which provides an extra degree of freedom in emphasizing the relative magnitude of the model reduction errors at low and high frequencies. The maximum model reduction error can be reduced to a lower value by an appropriate choice of the weighting factor. The direct model of B.C. Moore (1982) and the si... View full abstract»

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  • Chaotic signals: attractor reconstruction and local prediction

    Publication Year: 1991, Page(s):48 - 51 vol.1
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A procedure was developed to reconstruct a chaotic attractor and to make local prediction on a chaotic temporal series. It has been tested on many well-known chaotic systems. This algorithm also computes the embedding dimension of the system generating the time series. After many tests, it was used on real electrocardiographic signals. The experimental data are analyzed View full abstract»

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  • Computer aided analysis and design of lumped/distributed microstrip networks in inhomogeneous media

    Publication Year: 1991, Page(s):1069 - 1072 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    Explicit forms of the state and output equations of lumped/distributed networks in inhomogeneous media are derived. No restriction on the network topology is required. Multicoupled structures in inhomogeneous media occur frequently in microwave circuits, especially in integrated circuits. The effect of different mode propagation can easily be taken into consideration. Illustrative examples of micr... View full abstract»

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  • Cohn filters for minimizing thermal noise of Class A amplifiers

    Publication Year: 1991, Page(s):860 - 862 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    A Cohn filter circuit was designed to bypass the white noise generated by the thermal properties of a 150-W, 300-MHz class-A amplifier. The optimum values of the network components were derived, and the effects of harmonic distortion and noise were analyzed. A circuit has been developed for use in a system for magnetic resonance spectroscopy. The circuit was designed to reduce the thermal noise fl... View full abstract»

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  • An improved model for SOI enhancement and depletion JFETs with nonuniform channel parameters for low/high-speed applications

    Publication Year: 1991, Page(s):811 - 814 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The dynamic operation of various n-channel silicon-on-insulator (SOI) junction field effect transistors (JETs) is presented. A previously developed program, based on an accurate model of the SOI JFET I-V characteristics, taking into account the effect of SOI structure on the charge carrier mobility, is modified to include the calculations of the device parameters and high-speed f... View full abstract»

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  • A soft starting AC voltage regulator

    Publication Year: 1991, Page(s):184 - 185 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    A circuit has been designed and proven successful in protecting devices from sudden full power activity. This has been accomplished by using an active device as a varying resistance dependent on the supply voltage. The active device first appears as a large resistance and slowly decreases to a near-zero resistance, allowing all the voltage of the supply to be seen at the load. Other irregularities... View full abstract»

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  • Performance and dependability of gracefully-degradable multiprocessor systems

    Publication Year: 1991, Page(s):962 - 965 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The author presents an analytical model for dependability and performance evaluation of a multiprocessor system containing P processors, M memories, and B buses. The system is gracefully degradable and the main memory is M-way interleaved. In case of a fault the reconfiguration scheme will arrange the nonfaulty modules into groups, and the bus assignment to each... View full abstract»

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  • Control of lens position in auto-focus cameras using semiconductor laser range finder

    Publication Year: 1991, Page(s):395 - 398 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    It is proposed that a novel infrared range finder be used to get a just-focusing signal for an autofocus (AF) system employing both a measured distance to a moving object and its speed, and to control the lens position of video and single-lens reflex (SLR) cameras using the AF system. Some clear photographs of a moving object have been obtained by an SLR camera using the proposed AF system View full abstract»

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  • Simulation of comma free synchronization scheme and expected error span in variable length codes

    Publication Year: 1991, Page(s):253 - 256 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The use of variable-length code to achieve the optimum data rate is suggested. A comma insertion scheme is recommended to circumvent the limitation of loss of synchronization in variable-length coding. Algorithms are given to calculate the expected error span due to single or multiple bit inversions. A numerical approach is developed and simulated to determine error span for single bit inversion, ... View full abstract»

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  • Minimally synchronized architectures: a new approach to the design of parallel architectures

    Publication Year: 1991, Page(s):978 - 981 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    A special class of architecture which supports parallel interpretation of abstract machine language is presented. An experimental architecture based on this design procedure is presented. A cycle-level simulator of this machine is employed to measure and analyze the performance of the architecture with synthetic benchmark programs View full abstract»

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  • Linear processing of nonuniformly sampled signals

    Publication Year: 1991, Page(s):1105 - 1108 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The authors describe a novel approach, based on a coordinate transformation, that can process nonuniformly sampled signals efficiently, in the sense that the number of computations for processing the nonuniformly spaced data will be the same as in the uniform sampling case for the same number of samples in both cases. In situations where the nonuniform sampling results in fewer samples compared to... View full abstract»

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  • Implementation of pole-zero analysis in SPICE based on the MD method

    Publication Year: 1991, Page(s):380 - 383 vol.1
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The modification-decomposition (MD) method for finding the poles and zeros of a general circuit has been implemented in SPICE 3c1. The method is based on finding the eigenvalues of the time constant matrix, and convergence is guaranteed as long as the circuit has a DC solution. The method requires no complex operations and only one LU decomposition. It fits in very conveniently with the framework ... View full abstract»

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