Patents by Inventor Paul Keith Hartley

Paul Keith Hartley 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).

  • Integrated circuit including current mirror and dual-function transistor
    Patent number: 6281741
    Abstract: An IC comprises a pair of circuit nodes, a current mirror that includes dual-function transistor, and a controller for switching the transistor between a pair of states. In a first state, the transistor provides current gain and also provides a relatively high impedance between the nodes, and in a second state, it provides no current gain and a relatively lower impedance between the nodes.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: August 28, 2001
    Assignee: Agere Systems Guardian Corp.
    Inventor: Paul Keith Hartley
  • Integrated circuit including high transconductance voltage clamp
    Patent number: 6028466
    Abstract: An IC includes a clamp transistor for limiting the voltage at a circuit node and a current amplifier coupled across the input and output terminals of the clamp transistor. In one embodiment the current amplifier comprises a current mirror. In a differential line driver, the direction of current through a load is controlled by means of pair of dual-function transistors which also serve to provide current gain in separate current mirrors.
    Type: Grant
    Filed: February 5, 1998
    Date of Patent: February 22, 2000
    Assignee: Lucent Technologies Inc.
    Inventor: Paul Keith Hartley