Patents by Inventor David P. Gubbins

David P. Gubbins 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).

  • Brown-out detector
    Patent number: 6894544
    Abstract: A brown-out detector that continuously monitors power supply voltage and provides an output signal that transitions to a logic HIGH state when the monitored power supply voltage exceeds a predetermined threshold value. One embodiment of the present invention comprises a first voltage reference with respect to ground that varies in direct proportion to absolute temperature, a second voltage reference with respect to the supply voltage that varies inversely with absolute temperature, and a comparator having the first voltage reference coupled to one input, and the second voltage reference coupled to the other input, such that the comparator output changes state when the power supply voltage exceeds a predetermined threshold voltage that is relatively independent of absolute temperature. The circuit may also be configured such that the first voltage reference varies inversely with absolute temperature, while the second voltage reference varies in direct proportion to absolute temperature.
    Type: Grant
    Filed: June 2, 2003
    Date of Patent: May 17, 2005
    Assignee: Analog Devices, Inc.
    Inventor: David P. Gubbins
  • Brown-out detector
    Publication number: 20040239413
    Abstract: A brown-out detector that continuously monitors power supply voltage and provides an output signal that transitions to a logic HIGH state when the monitored power supply voltage exceeds a predetermined threshold value. One embodiment of the present invention comprises a first voltage reference with respect to ground that varies in direct proportion to absolute temperature, a second voltage reference with respect to the supply voltage that varies inversely with absolute temperature, and a comparator having the first voltage reference coupled to one input, and the second voltage reference coupled to the other input, such that the comparator output changes state when the power supply voltage exceeds a predetermined threshold voltage that is relatively independent of absolute temperature. The circuit may also be configured such that the first voltage reference varies inversely with absolute temperature, while the second voltage reference varies in direct proportion to absolute temperature.
    Type: Application
    Filed: June 2, 2003
    Publication date: December 2, 2004
    Inventor: David P. Gubbins