Patents by Inventor Chee Guan Tan

Chee Guan Tan 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).

  • Reducing offset of a differential signal output by a capacitive coupling stage of a hard disk drive preamplifier
    Patent number: 10803890
    Abstract: A preamplifier comprises an input stage and a capacitive coupling stage. The input stage is arranged to receive a differential signal from a magnetic resistor which indicates a magnetic field sensed on a magnetic disk of a hard disk drive (HDD) when the preamplifier is powered on from an off state. The capacitive coupling stage has an input arranged to receive the differential signal from the input stage, a filter comprising a first resistor, a second resistor, a first capacitor, a second capacitor, and switches arranged in parallel with respective resistors, where the switches are closed when the preamplifier is powered on from the off state to an on state. A switch control is arranged to determine that an offset of the differential signal has settled and open the switches based on the determination.
    Type: Grant
    Filed: December 4, 2019
    Date of Patent: October 13, 2020
    Assignee: Marvell Asia Pte., Ltd.
    Inventors: Xiaowei Huang, Ma Lin, Niviya Chacko, Sheng Ming Lai, Chee Guan Tan
  • Reducing Offset of a Differential Signal Output by a Capacitive Coupling Stage of a Hard Disk Drive Preamplifier
    Publication number: 20200184998
    Abstract: A preamplifier comprises an input stage and a capacitive coupling stage. The input stage is arranged to receive a differential signal from a magnetic resistor which indicates a magnetic field sensed on a magnetic disk of a hard disk drive (HDD) when the preamplifier is powered on from an off state. The capacitive coupling stage has an input arranged to receive the differential signal from the input stage, a filter comprising a first resistor, a second resistor, a first capacitor, a second capacitor, and switches arranged in parallel with respective resistors, where the switches are closed when the preamplifier is powered on from the off state to an on state. A switch control is arranged to determine that an offset of the differential signal has settled and open the switches based on the determination.
    Type: Application
    Filed: December 4, 2019
    Publication date: June 11, 2020
    Applicant: Marvell World Trade Ltd.
    Inventors: Xiaowei Huang, Ma Lin, Niviya Chacko, Sheng Ming Lai, Chee Guan Tan