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1887

IEE Proceedings G (Electronic Circuits and Systems)

Volume 135, Issue 1, February 1988

Volumes & issues:

Volume 135, Issue 1

February 1988

Multiple single-chip microcomputer approach to fire detection and monitoring system
  • Author(s): A.J. Al-khalili ; D. Al-khalili ; M.S. Khassem
  • Source: IEE Proceedings G (Electronic Circuits and Systems), Volume 135, Issue 1, p. 1 –10
  • DOI:  10.1049/ip-g-1.1988.0001
  • Type: Article
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  • p. 1 –10 (10)
    A complete system for fire detection and alarm monitoring has been proposed for complex plants. The system uses multiple single chip architecture attached to a party line. The control algorithm is based on a two-level hierarchy of decision making, thus the complexity is distributed. A complete circuit diagram is given for the local and the central station with requirements for the software structure. The design is kept in general form such that it can be adapted to a multitude of plant configurations. It is particularly shown how new developments in technology, especially CMOS single chip devices, are incorporated in the system design to reduce the complexity of the overall hardware, e.g. by decomposing the system such that lower levels of hierarchy are able to have some autonomy in decision making, and thus a more complex decision is solved in a simple distributed method.
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Algorithm for design centering based on use of sensitivity information
  • Author(s): N.G. Maratos
  • Source: IEE Proceedings G (Electronic Circuits and Systems), Volume 135, Issue 1, p. 11 –18
  • DOI:  10.1049/ip-g-1.1988.0002
  • Type: Article
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  • p. 11 –18 (8)
    A new and efficient algorithm is described for design centering with fixed component tolerances. Maximisation of the manufacturing yield is replaced by minimisation of a new performance criterion which explicitly involves circuit performance functions. Monte Carlo analysis and performance sensitivity evaluation of a tolerance region around the current nominal point provides the information for setting up a linearised version of the problem. A specially adapted version of the simplex method is used for solving the linearised problem. The resulting solution provides a new position for the nominal point with improved yield. Performance of the method is illustrated by application to a mathematical test problem and to two filter circuits. The computational cost of the proposed algorithm is shown to be small.
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Simple RC model for integrated multiterminal interconnections
Testing of random access memories: theory and practice
  • Author(s): P.K. Veenstra ; F.P.M. Beenker ; J.J.M. Koomen
  • Source: IEE Proceedings G (Electronic Circuits and Systems), Volume 135, Issue 1, p. 24 –28
  • DOI:  10.1049/ip-g-1.1988.0004
  • Type: Article
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  • p. 24 –28 (5)
    Testing of random access memories (RAMs) gives more and more problems. The dimensions are growing rapidly and the denser devices result in more complex failure modes. The goal of our research was the evaluation of the existing test patterns in SRAM testing. A large diversity of test patterns was executed on silicon SRAM wafers and results were compared. The results affirm the conclusions: that the use of a well-defined fault model results into a more efficient test for permanent faults; and that the twocoupling fault model appears to be very efficient.
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Prediction of RFI demodulation in bipolar operational amplifiers
Thermal CAD of power hybrid devices using light computer means
  • Author(s): A. Napieralski  and  F. Pompignac
  • Source: IEE Proceedings G (Electronic Circuits and Systems), Volume 135, Issue 1, p. 34 –43
  • DOI:  10.1049/ip-g-1.1988.0006
  • Type: Article
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  • p. 34 –43 (10)
    The aim of this paper is to present the practical implementation on microcomputer of a new method [1, 2, 3] of temperature calculation with a view to thermal CAD of power hybrid circuits. This method is based on the notion of punctual heat source, and of image sources used to represent simple boundary conditions such as adiabatic or isothermal planes. It was implemented in IBM PC-XT computer and the program was written in Pascal language. Some practical examples were presented and comparison with experiment was performed. The maximum number of temperature points at the surface in an actual version of our program is 100×76. The graphical representation of numerically obtained results is compatible with the infrared thermograph HUGHES TVS-4100. The problems of the speed of computation were treated with special care. For temperature calculation in hybrid power circuits this method is a serious concurrent of classical finite element method regarding its rapidity, precision and cheapness.
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