Patents by Inventor Vicki Lynn Pipal

Vicki Lynn Pipal 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).

  • System and method for providing head amplitude characterization
    Patent number: 7227709
    Abstract: To calibrate the VGA of a read head, test signals from a DAC are input to the VGA and the output of the VGA is observed, with the gain of the VGA being adjusted as appropriate. So that the DAC need not be made with tight tolerances, a DC signal can be fed into the DAC prior to VGA calibration, and an auxiliary ADC is used to receive the output of the DAC and to determine, for a given DC input, what the signal produced by the DAC actually is. In this way, during subsequent VGA calibration the test signal from the DAC is known not by virtue of the DAC having a tight manufacturing tolerance but by virtue of the actual measurements of its outputs for given register inputs.
    Type: Grant
    Filed: January 23, 2006
    Date of Patent: June 5, 2007
    Assignees: Hitachi Global Storage Technologies Netherlands B.V., Renesas Technology Corporation
    Inventors: Vicki Lynn Pipal, Michael William Curtis, Raymond Alan Richetta, Koji Nasu