Patents Represented by Attorney Donald L. Drumheller

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  • Fiber optic probe with a magneto-optic film on an end surface for detecting a current in an integrated circuit
    Patent number: 5451863
    Abstract: An apparatus and method for measuring the current distribution in an integrated circuit with high time resolution is described incorporating a magneto-optic film, a linearly polarized light beam and a means for measuring the magneto-optic polarization rotation of a light beam and circuitry for synchronizing test pulses in an integrated circuit. The invention overcomes the problem of determining current distribution as a function of time and location in an integrated circuit with 1 psec time resolution and 1 micrometer spatial resolution.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: September 19, 1995
    Assignee: International Business Machines Corporation
    Inventor: Mark R. Freeman