Patents by Inventor Wan Wah Loh

Wan Wah Loh 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).

  • Current sensor using leadframe as sensing element
    Patent number: 8446159
    Abstract: A current sensor is disclosed. The current sensor includes a leadframe having a die paddle, a portion of the die paddle being configured as a resistive element through which current can flow, and an integrated circuit (IC) die attached and thermally coupled to the die paddle. The IC die includes a current sensing module configured to measure a voltage drop across the resistive element and convert the voltage drop measurement to a current measurement signal and a temperature compensation module electrically coupled to the current sensing module. The temperature compensation module is configured to adjust the current measurement signal to compensate for temperature-dependent changes in the resistive element. The temperature compensation module includes a temperature-sensitive element, with a portion of the temperature-sensitive element located directly over a portion of the resistive element.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: May 21, 2013
    Assignee: Linear Technology Corporation
    Inventors: Edson Wayne Porter, Robert C. Chiacchia, Wan Wah Loh
  • LEADFRAME CURRENT SENSOR
    Publication number: 20120001649
    Abstract: A current sensor is disclosed. The current sensor includes a leadframe having a die paddle, a portion of the die paddle being configured as a resistive element through which current can flow, and an integrated circuit (IC) die attached and thermally coupled to the die paddle. The IC die includes a current sensing module configured to measure a voltage drop across the resistive element and convert the voltage drop measurement to a current measurement signal and a temperature compensation module electrically coupled to the current sensing module. The temperature compensation module is configured to adjust the current measurement signal to compensate for temperature-dependent changes in the resistive element. The temperature compensation module includes a temperature-sensitive element, with a portion of the temperature-sensitive element located directly over a portion of the resistive element.
    Type: Application
    Filed: June 30, 2010
    Publication date: January 5, 2012
    Applicant: Linear Technology Corporation
    Inventors: Edson Wayne Porter, Robert C. Chiacchia, Wan Wah Loh