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Method, apparatus, and computer program for evaluating noise immunity of a semiconductor device

  • US 7,233,889 B2
  • Filed: 10/23/2002
  • Issued: 06/19/2007
  • Est. Priority Date: 10/25/2001
  • Status: Active Grant
First Claim
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1. A noise immunity evaluation design apparatus for evaluating noise immunity using a software simulation that represents a design of a circuit for a semiconductor device comprising:

  • an acquiring unit, acquiring the software simulation, the software simulation including a simulated external noise source, a simulated external circuit, an impedance of a design power supplying circuit, an impedance of a design logic circuit, and an impedance of a design grounding circuit, the noise immunity evaluation apparatus further comprising;

    a specifying unit, specifying a first frequency of a voltage generated by the noise source;

    a calculating unit, calculating a first voltage directly across the design logic circuit impedance when a voltage of the specified first frequency is applied;

    an outputting unit, outputting the specified first frequency and the calculated first voltage; and

    an evaluation unit operable to output an evaluation of the noise immunity of the simulation circuit model, for the first frequency of a voltage generated by the noise source in comparison with a predetermined tolerance level for external noise where the evaluation is utilized to modify at least one of the impedances until the calculated first voltage falls within the predetermined tolerance level.

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