Patents by Inventor Carl R. M. Hejdeman

Carl R. M. Hejdeman 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 apparatus for improving the reliability of the reading of integrated circuit fuses
    Patent number: 6903986
    Abstract: A system is provided for use with an on-chip fuse. If the fuse (40) is to be blown, the system blows the fuse, then performs a test read by comparing it with a larger-than-normal reference resistance (41, 42). If, even using the larger-than-normal reference resistance, the fuse reads as blown, then it is possible to be much more confident that the fuse will read correctly when compared against the normal reference resistance (42), even with aging and with variations of temperature and supply. For future reads during normal operation, the system compares it with the normal reference resistance (42). If, on the other hand, the fuse does not read as blown during the test read then the device can be rejected as a failed device.
    Type: Grant
    Filed: July 3, 2002
    Date of Patent: June 7, 2005
    Assignee: Semtech Corporation
    Inventors: Carl R. M. Hejdeman, Andrew McKnight
  • Method and apparatus for improving the reliability of the reading of integrated circuit fuses
    Publication number: 20040257892
    Abstract: A system is provided for use with an on-chip fuse. If the fuse (40) is to be blown, the system blows the fuse, then performs a test read by comparing it with a larger-than-normal reference resistance (41, 42). If, even using the larger-than-normal reference resistance, the fuse reads as blown, then it is possible to be much more confident that the fuse will read correctly when compared against the normal reference resistance (42), even with aging and with variations of temperature and supply. For future reads during normal operation, the system compares it with the normal reference resistance (42). If, on the other hand, the fuse does not read as blown during the test read then the device can be rejected as a failed device.
    Type: Application
    Filed: August 10, 2004
    Publication date: December 23, 2004
    Inventors: Carl R.M. Hejdeman, Andrew McKnight