Patents by Inventor John Grawcock

John Grawcock 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).

  • Technique for improving negative potential immunity of an integrated circuit
    Patent number: 7436223
    Abstract: An integrated circuit (IC) with negative potential protection includes a switch, a gate drive circuit and a comparator. The switch includes a double-diffused metal-oxide semiconductor (DMOS) cell formed in a first-type epitaxial pocket, which is formed in a second-type substrate. The switch also includes a second-type+ isolation ring formed in the substrate to isolate the first-type epitaxial pocket. An output of the gate drive circuit is coupled across a gate and a source of the switch. An output of the comparator is coupled to a second input of the gate drive circuit and a first input of the comparator receives a reference signal. A second input of the comparator is coupled to the epitaxial pocket. The comparator provides a turn-on signal that causes the switch to conduct current, when a signal at the second input of the comparator is below the reference signal.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: October 14, 2008
    Assignee: Delphi Technolopgies, Inc.
    Inventors: Mark W. Gose, John A. Grawcock
  • Technique for improving negative potential immunity of an integrated circuit
    Publication number: 20070096776
    Abstract: An integrated circuit (IC) with negative potential protection includes a switch, a gate drive circuit and a comparator. The switch includes a double-diffused metal-oxide semiconductor (DMOS) cell formed in a first-type epitaxial pocket, which is formed in a second-type substrate. The switch also includes a second-type+ isolation ring formed in the substrate to isolate the first-type epitaxial pocket. An output of the gate drive circuit is coupled across a gate and a source of the switch. An output of the comparator is coupled to a second input of the gate drive circuit and a first input of the comparator receives a reference signal. A second input of the comparator is coupled to the epitaxial pocket. The comparator provides a turn-on signal that causes the switch to conduct current, when a signal at the second input of the comparator is below the reference signal.
    Type: Application
    Filed: October 28, 2005
    Publication date: May 3, 2007
    Inventors: Mark Gose, John Grawcock