Patents by Inventor Shang-Ching Dong

Shang-Ching Dong 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).

  • Architecture for a hard disk drive write amplifier circuit with damping control
    Patent number: 6683740
    Abstract: A write amplifier circuit in a magnetic storage system has a cross coupling circuit and an active damp circuit to supply an improved write current to the head writing the data onto the media within the magnetic storage system. The inclusion of the cross coupling circuit decreases a rise time and a fall time associated with the write current. The active damp circuit reduces the undershoot and ringing of the write current. Thus, the write amplifier circuit is suitable for high speed data storage writing applications requiring minimal distortion of the data written to a magnetic medium. The write amplifier circuit achieves these improvements in the waveform of the write current by incorporating circuit elements and using both a negative feedback path and a feedforward path.
    Type: Grant
    Filed: February 15, 2000
    Date of Patent: January 27, 2004
    Assignees: Sony Corporation, Sony Electronics, Inc.
    Inventors: Soon-Gil Jung, Shang-Ching Dong, Hiroshi Takeuchi, Norio Shoji, Keiji Narusawa, Michiya Sako