Patents by Inventor Cliff C. Zhang

Cliff C. Zhang 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).

  • Measuring a load resistance coupled to a transmission line
    Patent number: 11029348
    Abstract: Measurement circuitry is disclosed that is configured to be coupled to a load through a transmission line. A first AC signal having a frequency ?1 is applied to the transmission line and a first input impedance of the transmission line is measured. A second AC signal having a frequency ?2 is applied to the transmission line and a second input impedance of the transmission line is measured, wherein the frequency ?2 is different than the frequency ?1. A third AC signal having a frequency ? is applied to the transmission line and a third input impedance of the transmission line is measured, wherein the frequency ? is different than the frequency ?1 and different than the frequency ?2. A resistance of the load is measured based on the measured first input impedance, the measured second input impedance, and the measured third input impedance.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: June 8, 2021
    Assignee: Western Digital Technologies, Inc.
    Inventors: Sergey G. Muchiyev, Yaw Shing Tang, Cliff C. Zhang
  • MEASURING A LOAD RESISTANCE COUPLED TO A TRANSMISSION LINE
    Publication number: 20200150166
    Abstract: Measurement circuitry is disclosed that is configured to be coupled to a load through a transmission line. A first AC signal having a frequency ?1 is applied to the transmission line and a first input impedance of the transmission line is measured. A second AC signal having a frequency ?2 is applied to the transmission line and a second input impedance of the transmission line is measured, wherein the frequency ?2 is different than the frequency ?1. A third AC signal having a frequency ? is applied to the transmission line and a third input impedance of the transmission line is measured, wherein the frequency ? is different than the frequency ?1 and different than the frequency ?2. A resistance of the load is measured based on the measured first input impedance, the measured second input impedance, and the measured third input impedance.
    Type: Application
    Filed: November 9, 2018
    Publication date: May 14, 2020
    Inventors: Sergey G. Muchiyev, Yaw Shing Tang, Cliff C. Zhang