Patents by Inventor Michael Philip Straub

Michael Philip Straub 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).

  • Methods and apparatus for controlling write driver current
    Patent number: 7660064
    Abstract: A hard disk drive write driver circuit is described that can change the output impedance of the write driver by use of a lookup table of control values. A control value is selected from the lookup table by using an address based on a dynamic system variable and a program controlled value. The dynamic system variable is converted to a digital representation. The digital representation and a portion of the program controlled value are used as an address to the lookup table to select a control value. The write driver is responsive to the selected control value to control overshoot current. A method to digitally program the output impedance of a preamp write driver based on realistic operating data is also discussed. An additional approach to controlling overshoot current in a write driver through digital control of overshoot duration is also described.
    Type: Grant
    Filed: January 11, 2005
    Date of Patent: February 9, 2010
    Assignee: Agere Systems Inc.
    Inventors: James Patrick Howley, Michael Philip Straub
  • Methods and Apparatus for Controlling Write Driver Current
    Publication number: 20090116134
    Abstract: A hard disk drive write driver circuit is described that can change the output impedance of the write driver by use of a lookup table of control values. A control value is selected from the lookup table by using an address based on a dynamic system variable and a program controlled value. The dynamic system variable is converted to a digital representation. The digital representation and a portion of the program controlled value are used as an address to the lookup table to select a control value. The write driver is responsive to the selected control value to control overshoot current. A method to digitally program the output impedance of a preamp write driver based on realistic operating data is also discussed. An additional approach to controlling overshoot current in a write driver through digital control of overshoot duration is also described.
    Type: Application
    Filed: January 11, 2005
    Publication date: May 7, 2009
    Applicant: AGERE SYSTEMS INC.
    Inventors: James Patrick Howley, Michael Philip Straub