Patents by Inventor Gary Lopes

Gary Lopes 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).

  • Arrangement in a power mosfet
    Patent number: 6818951
    Abstract: Linearity and/or efficiency of a power MOS transistor comprising a plurality of transistor segments connected in parallel, is improved in that at least one group of said transistor segments has a different threshold voltage than the rest of the transistor segments.
    Type: Grant
    Filed: July 18, 2001
    Date of Patent: November 16, 2004
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Thomas Moller, Nils Af Ekenstam, Jan Johansson, Timothy Ballard, Gary Lopes, Michael Peternel
  • Adaptive biasing of RF power transistors
    Patent number: 6448616
    Abstract: A power transistor according to one embodiment of the invention includes a plurality of transistor elements located on a single semiconductor die, each transistor element comprising one or more transistors coupled to a common gate terminal for the respective transistor element. A resistor network couples the transistor element gate terminals between a bias voltage and a reference ground, with resistors in the network sized such that such that a first transistor element is biased in a first, e.g., class A, operating condition, and a second transistor element is biased in a second, e.g., class AB operating condition.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: September 10, 2002
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Prasanth Perugupalli, Gary Lopes
  • Arrangement in a power mosfet
    Publication number: 20020047140
    Abstract: Linearity and/or efficiency of a power MOS transistor comprising a plurality of transistor segments connected in parallel, is improved in that at least one group of said transistor segments has a different threshold voltage than the rest of the transistor segments.
    Type: Application
    Filed: July 18, 2001
    Publication date: April 25, 2002
    Inventors: Thomas Moller, Nils Af Ekenstam, Jan Johansson, Timothy Ballard, Gary Lopes, Michael Peternel