Patents by Inventor Jeffrey Kwabena Okyere

Jeffrey Kwabena Okyere 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).

  • Self-contained built-in self-test circuit with phase-shifting abilities for high-speed receivers
    Patent number: 11662381
    Abstract: Aspects of the invention include a phase rotator, that is located at a built-in self-test (BIST) path of a receiver, receiving a clock signal from an on-chip clock. The phase rotator shifts the phases of the clock signal. The phase rotator transmits the shifted clock signal to a binary sequence generator, that is located at the receiver. The binary sequence generator outputs a binary sequence, where the binary sequence generator is driven by the shifted clock signal.
    Type: Grant
    Filed: August 18, 2021
    Date of Patent: May 30, 2023
    Assignee: International Business Machines Corporation
    Inventors: Nathan Ross Blanchard, Venkat Harish Nammi, Dereje Yilma, Chad Andrew Marquart, Glen A. Wiedemeier, Jeffrey Kwabena Okyere, Erik English, Christopher Steffen, Vikram B Raj, Michael Wayne Harper
  • SELF-CONTAINED BUILT-IN SELF-TEST CIRCUIT WITH PHASE-SHIFTING ABILITIES FOR HIGH-SPEED RECEIVERS
    Publication number: 20230055935
    Abstract: Aspects of the invention include a phase rotator, that is located at a built-in self-test (BIST) path of a receiver, receiving a clock signal from an on-chip clock. The phase rotator shifts the phases of the clock signal. The phase rotator transmits the shifted clock signal to a binary sequence generator, that is located at the receiver. The binary sequence generator outputs a binary sequence, where the binary sequence generator is driven by the shifted clock signal.
    Type: Application
    Filed: August 18, 2021
    Publication date: February 23, 2023
    Inventors: Nathan Ross Blanchard, VENKAT HARISH NAMMI, DEREJE YILMA, Chad Andrew Marquart, Glen A. Wiedemeier, JEFFREY KWABENA OKYERE, Erik English, Christopher Steffen, Vikram B. Raj, Michael Wayne Harper
  • Built-in-self-test and characterization of a high speed serial link receiver
    Patent number: 11528102
    Abstract: Aspects of the invention include a driver arranged at a stand-alone receiver that is configured to receive a binary sequence from a pseudorandom binary sequence (PRBS) generator arranged at the receiver. The driver is configured to adjust the signal characteristics of the binary sequence to simulate channel loss at the receiver. The driver is further configured to output the adjusted binary sequence to a downstream data path of the receiver to enable the receiver to perform a self-test.
    Type: Grant
    Filed: August 18, 2021
    Date of Patent: December 13, 2022
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Dereje Yilma, Nathan Ross Blanchard, Erik English, Chad Andrew Marquart, Glen A. Wiedemeier, Jeffrey Kwabena Okyere, James Crugnale, Christopher Steffen, Vikram B Raj, Michael Wayne Harper, Venkat Harish Nammi
  • Jitter attenuation buffer structure
    Patent number: 10958248
    Abstract: A method and apparatus are described to implement a bandpass filter in a current mode logic (CML) stage of a clock tree in an electronic system. The bandpass filter has a bandpass filter transfer function to attenuate frequencies lower than and higher than a carrier frequency. The bandpass filter uses adjustable active inductors and capacitive source degeneration. Adjustable resistors may be controlled to move a peak frequency of the bandpass filter transfer function to a higher or lower frequency. The adjustable active inductors and capacitive degeneration may consist of field effect transistors.
    Type: Grant
    Filed: May 27, 2020
    Date of Patent: March 23, 2021
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Yang You, Glen A. Wiedemeier, Chad Andrew Marquart, Jeffrey Kwabena Okyere, Daniel M. Dreps, Sudipto Chakraborty