Patents by Inventor Howard T. Russell

Howard T. Russell 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 breaking a feedback loop using a voltage controlled voltage source terminated subnetwork model
    Patent number: 8028256
    Abstract: A system and method is disclosed for breaking a feedback loop by replacing at least one component in the feedback loop with a model containing two physically disconnected subnetworks that have terminals that are connected to ground with voltage controlled, voltage sources (VCVSs). Dependent source parameters of the VCVSs control lateral signal transfer though the model allowing the feedback loop to be opened or closed. The model maybe used in a software simulation in which a replicate circuit is used to set and maintain a closed-loop bias on the open-loop circuit. Small-signal analysis of the equivalent open-loop circuit allows extraction of transfer functions that yield a return ratio RR(s) corresponding to the modeled component.
    Type: Grant
    Filed: September 18, 2007
    Date of Patent: September 27, 2011
    Assignee: National Semiconductor Corporation
    Inventor: Howard T. Russell, Jr.
  • Current mirror circuit
    Patent number: 7636016
    Abstract: An all-NPN bipolar junction current mirror circuit for mirroring an input reference current is disclosed. The circuit includes an input stage for providing an input reference current to the current mirror circuit, a reference stage for mirroring the input reference current and an output stage electrically connected to the reference stage for providing the mirrored input current to at least one load.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: December 22, 2009
    Assignee: Board of Regents, The University of Texas System
    Inventors: Howard T. Russell, Ronald L. Carter, Wendell A. Davis
  • CURRENT MIRROR CIRCUIT
    Publication number: 20090072909
    Abstract: An all-NPN bipolar junction current mirror circuit for mirroring an input reference current is disclosed. The circuit includes an input stage for providing an input reference current to the current mirror circuit, a reference stage for mirroring the input reference current and an output stage electrically connected to the reference stage for providing the mirrored input current to at least one load.
    Type: Application
    Filed: September 17, 2007
    Publication date: March 19, 2009
    Inventors: Howard T. Russell, Ronald L. Carter, Wendell A. Davis
  • System and method for breaking a feedback loop using a voltage controlled voltage source terminated subnetwork model
    Patent number: 7334199
    Abstract: A system and method is disclosed for breaking a feedback loop by replacing at least one component in the feedback loop with a model containing two physically disconnected subnetworks that have terminals that are connected to ground with voltage controlled, voltage sources (VCVSs). Dependent source parameters of the VCVSs control lateral signal transfer though the model allowing the feedback loop to be opened or closed. The model maybe used in a software simulation in which a replicate circuit is used to set and maintain a closed-loop bias on the open-loop circuit. Small-signal analysis of the equivalent open-loop circuit allows extraction of transfer functions that yield a return ratio RR(s) corresponding to the modeled component.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: February 19, 2008
    Assignee: National Semiconductor Corporation
    Inventor: Howard T. Russell, Jr.