Volume 30 Issue 2 • Feb. 1993

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Displaying Results 1 - 6 of 6
  • Cleaning (electronics industry safety)

    Publication Year: 1993, Page(s):20 - 26
    Cited by:  Papers (13)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1217 KB)

    The problems posed by toxic materials used in electronics manufacturing are examined. The materials posing the greatest risks to workers and the environment are discussed. They are the ethylene glycol ethers used to thin the photoresist used in IC manufacture; fluorocarbons and trichloroethane, which destroy atmospheric ozone; and heavy metals. The search for alternatives is described.<<ETX&... View full abstract»

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  • Adaptive fuzzy systems

    Publication Year: 1993, Page(s):27 - 31
    Cited by:  Papers (45)  |  Patents (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (785 KB)

    Conventional fuzzy control systems using PID (proportional-integral-derivative) control and their limitations are discussed. Ways to incorporate adaptivity are examined. The functioning of adaptive fuzzy logic and adaptive fuzzy control systems is described. The use of rule weights is explained.<<ETX>> View full abstract»

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  • Kilowatts on order (power amplifiers)

    Publication Year: 1993, Page(s):32 - 37
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1648 KB)

    The development of pulse-width-modulation (PWM) power amplifiers based on fast-switching MOSFETs and their applications are described. Their ability to drive magnets efficiently, neutralize power line harmonics, and control motion with precision is examined. Active filter and active magnetic bearing implementations are discussed.<<ETX>> View full abstract»

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  • Two ways to catch a wave (oscilloscopes)

    Publication Year: 1993, Page(s):38 - 41
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (590 KB)

    Digital and analog oscilloscopes are compared. It is shown that digital oscilloscopes can compete with the best analog types when they are used with analog-to-digital converters that run at 4 Gsamples/s. The advantages of the digital instruments are examined.<<ETX>> View full abstract»

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  • Facsimile's false starts

    Publication Year: 1993, Page(s):46 - 49
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (738 KB)

    The development of the 150-year-old facsimile concept is recounted. The factors that have made it such a popular technology are examined. Its evolution from use in niche markets only to broader use, and the shift of initiative in developing the technology to Japan in the 1980s, are discussed. Standards setting, advantages of facsimile, and legal issues are addressed.<<ETX>> View full abstract»

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  • 'A' for effort (technology transfer education)

    Publication Year: 1993, Page(s):50 - 52
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (433 KB)

    An experiment conducted at Carnegie Mellon University in using students for technology transfer is described. It consisted of sending six students who has completed their sophomore studies in CMU's Department of Electrical and Computer Engineering to visit semiconductor firms in the summer of 1990. They took with them AWEsim, a CMU-developed circuit simulation program. Although the idea of using s... View full abstract»

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