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IEE Proceedings G - Circuits, Devices and Systems

Issue 4 • Date Aug. 1991

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Displaying Results 1 - 14 of 14
  • Analysis and VLSI architecture of a nonlinear edge-preserving noise-smoothing image filter

    Publication Year: 1991, Page(s):433 - 440
    Cited by:  Papers (1)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1005 KB)

    A nonlinear, nonrecursive, two-dimensional filter for edge preserving and noise smoothing of images is developed. The filter is applied over a 3*3 window of pixels and uses a thresholding operation. It is tested against other filters of the same class and its efficiency is proven by simulation. Analytical evaluation is also performed using a first-order stochastic Markov model. The computational r... View full abstract»

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  • Extended diagonal structure for address generation of the prime factor algorithm

    Publication Year: 1991, Page(s):449 - 456
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (568 KB)

    In the paper, an extended diagonal structure is used efficiently for the address generation of the prime factor algorithm (PFA). This approach is in-place, in-order and requires less temporary storage during the computation. It requires very few modulo operations and no modulo inverse for its computation; these inverses often take up a large memory space for storage in other address generation alg... View full abstract»

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  • Analogue implementation of the Hough transform

    Publication Year: 1991, Page(s):457 - 462
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (473 KB)

    In digital implementations of the Hough transform, either digital multiplication or table lookup are used in the calculations. Equivalent results may be obtained using an analogue representation. Each edge point in the image is used to generate a signal representing the continuous form of the Hough transform for that point. The signal is either stored in its analogue form in an analogue memory, or... View full abstract»

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  • Modelling of capacitively (resistively)-loaded uniform RC lines for computer aided analysis

    Publication Year: 1991, Page(s):463 - 466
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (269 KB)

    A simple model for capacitively (resistively)-loaded uniformly distributed RC (URC) lines is presented. The model consists of only three passive elements. The model can be used to predict the response of the URC line at any arbitrary position. The model can be easily implemented for computer-aided analysis and design of circuits and systems comprising capacitively (resistively)-loaded URC lines.<<... View full abstract»

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  • Design centring for yield and noise figure improvement of GaAs MESFETs

    Publication Year: 1991, Page(s):467 - 473
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (467 KB)

    An algorithm to determine the optimum nominal value of geometrical and material parameters in device modelling is proposed. The algorithm uses the yield and variance prediction formula and Monte-Carlo analysis. The optimum parameters are obtained when the yield becomes maximum. The performance specification of the noise figure must also be satisfied. Another algorithm for determining the optimal n... View full abstract»

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  • Minimum sensitivity IIR filter design using principal component approach

    Publication Year: 1991, Page(s):474 - 482
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (561 KB)

    An IIR filter design algorithm in the state space model is presented. The methods of principal component analysis and balanced realisation are employed to solve the design problem so that the designed filter in state space form achieves minimum sensitivity to parameter variation and/or roundoff noise. Two design examples are also presented to indicate the advantages.<> View full abstract»

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  • Analysis of analogue circuit implementations from translinear blocks

    Publication Year: 1991, Page(s):483 - 491
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (623 KB)

    A translinear standard cell approach able to improve the design of analogue ASICs is introduced in the paper. Two basic cells consisting of only bipolar transistors are considered, and their equivalent symbols proposed. The properties which result from the various interconnections between cells are studied in detail. The advisability of implementing elementary cells and macrocells in a translinear... View full abstract»

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  • Half-band filter design with odd-polynomial Chebyshev approximation

    Publication Year: 1991, Page(s):492 - 500
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (618 KB)

    An efficient method for the design of the half-band filter is described. Both the characteristics of the time response and the frequency response of the half-band filter are fully utilised to reduce the computation time and to increase the computation accuracy. The algorithm is based on the Chebyshev approximation criterion and uses only odd-symmetry polynomials for frequency interpolation to meet... View full abstract»

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  • Evaluation of packaging strays in discrete semiconductor devices

    Publication Year: 1991, Page(s):501 - 509
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (574 KB)

    The stray components introduced by device packaging are considered. It is necessary to be able to accurately describe these effects to simulate complete devices. The measurement of the parameters of the package model is considered. A procedure for evaluating the stray components is introduced and results presented. The development of a new probe is also presented, which enables discrete chip devic... View full abstract»

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  • Temperature effects on high power low on-resistance MOS-bipolar transistor module

    Publication Year: 1991, Page(s):510 - 522
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (783 KB)

    The problem of the temperature dependence of power transistors, under static conditions and switching times, has been addressed. The usual simplified differential equation has been extended to nonlinear analysis. The nonlinear differential equation has been solved, and the prediction compared with the experiments. A novel development of the MOS-bipolar hybrid module concept facilitates the neutral... View full abstract»

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  • Design of circularly symmetric two- and three-dimensional digital filters using the concept of the GIC

    Publication Year: 1991, Page(s):523 - 529
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (362 KB)

    A realisation method for two-dimensional and three-dimensional rotated infinite-impulse response digital filters based on the concept of the generalised-immittance convertor is proposed. First, analogue reference networks realising first- and second-order transfer functions of rotated two-dimensional and three-dimensional filters are constructed; corresponding digital-filter structures are then de... View full abstract»

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  • Efficient algorithm for rational transformation on polynomials

    Publication Year: 1991, Page(s):530 - 532
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (200 KB)

    An efficient and simple algorithm is developed for arbitrary polynomial transformation using a polynomial interpolation technique. The new algorithm is compared with the existing ones for a number of multiplications and additions. It is superior to the other algorithms in terms of both the number of calculations and the memory requirement. It is also shown how the algorithm can be extended for the... View full abstract»

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  • Method of optimum oscillator design using power-dependent S-parameters

    Publication Year: 1991, Page(s):533 - 540
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (496 KB)

    A graphical approach is described for the optimum design of microwave FET oscillators. By use of nonlinear FET S-parameters, defined as functions of the output power, the input and output powers are represented by distorted paraboloids of revolution. Using these newly defined nonlinear S-parameters, the design procedure for microwave FET oscillators is illustrated, based on the paraboloids.<> View full abstract»

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  • Reduction of spectral distortion in class D amplifiers by an enhanced pulse width modulation sampling process

    Publication Year: 1991, Page(s):441 - 448
    Cited by:  Papers (9)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (480 KB)

    An enhanced sampling process which can be used to reduce spectral distortion in the output of digital pulse width modulated class D amplifiers is presented. This process arises from a generalisation of the concepts of natural and uniform sampling and can be adjusted such that the spectra produced by the process can take a number of forms for the same signal. Analytical expressions for the spectra ... View full abstract»

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