Patents by Inventor Yi-Hsiu E. CHEN

Yi-Hsiu E. CHEN 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).

  • Patent number: 12519462
    Abstract: The present disclosure describes embodiments of driver circuit. The driver circuit includes a first impedance element electrically coupled to a first inverter circuit and a second impedance element electrically coupled to the first impedance element and a second inverter circuit. For a first encoding using the driver circuit, the first inverter circuit and the second inverter circuit are controlled such that a first current flows through the first and second impedance elements, the first current having a first value and a first direction. For a second encoding using the driver circuit, the first inverter circuit and the second inverter circuit are controlled such that a second current flows through the first and second impedance elements, the second current having a second value and a second direction. The first value is substantially the same as the second value and the first direction is opposite to the second direction.
    Type: Grant
    Filed: May 15, 2024
    Date of Patent: January 6, 2026
    Assignee: Apple Inc.
    Inventors: Charles L. Wang, Yi-Hsiu E. Chen, Pranavi Sunkara
  • Patent number: 12452110
    Abstract: An apparatus for performing a fast common mode recharge is disclosed. The apparatus includes a transmitter circuit configured to transmit a differential signal on a communication bus that includes a true signal line and a complement signal line and a measurement circuit configured to measure respective voltage levels of the true signal line and the complement signal line. The apparatus further includes a control circuit configured to, in response to exiting a sleep mode, select one of a plurality of operation modes using the respective voltage levels of the true signal line and the complement signal line. The transmitter circuit is further configured to adjust the respective voltage levels of the true signal line and the complement signal line based on a selected operation mode of the plurality of operation modes.
    Type: Grant
    Filed: June 21, 2023
    Date of Patent: October 21, 2025
    Assignee: Apple Inc.
    Inventors: Charles L. Wang, Yi-Hsiu E. Chen, Yu-Yau Guo, Wei-Ming Lee
  • Publication number: 20240430138
    Abstract: An apparatus for performing a fast common mode recharge is disclosed. The apparatus includes a transmitter circuit configured to transmit a differential signal on a communication bus that includes a true signal line and a complement signal line and a measurement circuit configured to measure respective voltage levels of the true signal line and the complement signal line. The apparatus further includes a control circuit configured to, in response to exiting a sleep mode, select one of a plurality of operation modes using the respective voltage levels of the true signal line and the complement signal line. The transmitter circuit is further configured to adjust the respective voltage levels of the true signal line and the complement signal line based on a selected operation mode of the plurality of operation modes.
    Type: Application
    Filed: June 21, 2023
    Publication date: December 26, 2024
    Inventors: Charles L. Wang, Yi-Hsiu E. Chen, Yu-Yau Guo, Wei-Ming Lee
  • Publication number: 20240305287
    Abstract: The present disclosure describes embodiments of driver circuit. The driver circuit includes a first impedance element electrically coupled to a first inverter circuit and a second impedance element electrically coupled to the first impedance element and a second inverter circuit. For a first encoding using the driver circuit, the first inverter circuit and the second inverter circuit are controlled such that a first current flows through the first and second impedance elements, the first current having a first value and a first direction. For a second encoding using the driver circuit, the first inverter circuit and the second inverter circuit are controlled such that a second current flows through the first and second impedance elements, the second current having a second value and a second direction. The first value is substantially the same as the second value and the first direction is opposite to the second direction.
    Type: Application
    Filed: May 15, 2024
    Publication date: September 12, 2024
    Applicant: APPLE INC.
    Inventors: Charles L. Wang, Yi-Hsiu E. Chen, Pranavi Sunkara
  • Patent number: 12015413
    Abstract: The present disclosure describes embodiments of driver circuit. The driver circuit includes a first impedance element electrically coupled to a first inverter circuit and a second impedance element electrically coupled to the first impedance element and a second inverter circuit. For a first encoding using the driver circuit, the first inverter circuit and the second inverter circuit are controlled such that a first current flows through the first and second impedance elements, the first current having a first value and a first direction. For a second encoding using the driver circuit, the first inverter circuit and the second inverter circuit are controlled such that a second current flows through the first and second impedance elements, the second current having a second value and a second direction. The first value is substantially the same as the second value and the first direction is opposite to the second direction.
    Type: Grant
    Filed: September 15, 2022
    Date of Patent: June 18, 2024
    Assignee: Apple Inc.
    Inventors: Charles L. Wang, Yi-Hsiu E. Chen, Pranavi Sunkara
  • Publication number: 20240097667
    Abstract: The present disclosure describes embodiments of driver circuit. The driver circuit includes a first impedance element electrically coupled to a first inverter circuit and a second impedance element electrically coupled to the first impedance element and a second inverter circuit. For a first encoding using the driver circuit, the first inverter circuit and the second inverter circuit are controlled such that a first current flows through the first and second impedance elements, the first current having a first value and a first direction. For a second encoding using the driver circuit, the first inverter circuit and the second inverter circuit are controlled such that a second current flows through the first and second impedance elements, the second current having a second value and a second direction. The first value is substantially the same as the second value and the first direction is opposite to the second direction.
    Type: Application
    Filed: September 15, 2022
    Publication date: March 21, 2024
    Applicant: Apple Inc.
    Inventors: Charles L. WANG, Yi-Hsiu E. CHEN, Pranavi SUNKARA