Patents by Inventor Matthew Scheffer

Matthew Scheffer 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).

  • Voltage mode transceiver having programmable voltage swing and external reference-based calibration
    Patent number: 7135884
    Abstract: An integrated device includes a voltage mode transmit driver for matching an output impedance to an output transmission line based on a binary code, an input termination module configured for matching an input impedance to an input transmission line based on an input impedance calibration value using thermometer-based decoding. The voltage mode transmit driver includes, for each differential output signal, a resistor network circuit having pull-up circuits and pull-down circuits for changing the voltage on the differential output signal, and having binary weighted resistance values relative to each other. The input termination module includes pull-up circuits and pull-down circuits having inverse hyperbolic resistance values relative to each other, and using thermometer-based decoding to ensure a linear change in input impedance during transitions in the input impedance calibration value.
    Type: Grant
    Filed: January 13, 2005
    Date of Patent: November 14, 2006
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Gerald Robert Talbot, Matthew Scheffer, Austen John Hypher