Patents by Inventor Osamn S. Nakagawa

Osamn S. Nakagawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and system for screening a VLSI design for inductive coupling noise
    Patent number: 6487703
    Abstract: A method is disclosed for estimating inductive coupling noise of a signal on a transmission line in a circuit design stored in a computer memory. The method determines the capacitive coupling noise on the signal, adds inductive coupling noise, and compares the total to a specified maximum amount of noise. The inductive coupling is a percentage of a supply voltage, which percentage varies depending upon the transition rate of the signal, the resistance of the line, and the gate capacitance of a load on the line. The inductive coupling varies based on the circuit design and may be stored in a table having inductive coupling values for multiple design conditions. The table is created using a field solver to determine line characteristics and a circuit simulator to simulate inductive coupling noise. For each set of initial conditions, a worst-case inductive coupling value is recorded in the table.
    Type: Grant
    Filed: July 19, 2001
    Date of Patent: November 26, 2002
    Assignee: Hewlett-Packard Company
    Inventors: John G. McBride, Osamn S. Nakagawa, Shen Lin