Patents by Inventor Zhong-Ding Liu

Zhong-Ding Liu 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).

  • Differential amplifier and comparator using the same
    Patent number: 6980050
    Abstract: A differential amplifier. A differential pair constructed by a first transistor and the second transistor receives differential input signals. The gate terminals of a third and fourth transistor are coupled to the source terminals of the fourth transistor and the third transistor respectively, and the third and fourth transistor construct a feedback device. This feedback device provides a positive feedback to the differential pair in the differential mode, thereby increasing AC amplitude of the differential amplifier. Further this feedback device substantially brings the drain currents of the first current path and the second current path into coincidence in the Vcom mode.
    Type: Grant
    Filed: September 8, 2004
    Date of Patent: December 27, 2005
    Assignee: Via Technologies, Inc.
    Inventor: Zhong-Ding Liu
  • Differential amplifier and comparator using the same
    Patent number: 6885245
    Abstract: A differential amplifier. A differential pair constructed by a first transistor and the second transistor receives differential input signals. The gate terminals of a third and fourth transistor are coupled to the source terminals of the fourth transistor and the third transistor respectively, and the third and fourth transistor construct a feedback device. This feedback device provides a positive feedback to the differential pair in the differential mode, thereby increasing AC amplitude of the differential amplifier. Further this feedback device substantially brings the drain currents of the first current path and the second current path into coincidence in the Vcom mode.
    Type: Grant
    Filed: April 8, 2003
    Date of Patent: April 26, 2005
    Assignee: VIA Technologies, Inc.
    Inventor: Zhong-Ding Liu
  • Differential amplifier and comparator using the same
    Publication number: 20050030095
    Abstract: A differential amplifier. A differential pair constructed by a first transistor and the second transistor receives differential input signals. The gate terminals of a third and fourth transistor are coupled to the source terminals of the fourth transistor and the third transistor respectively, and the third and fourth transistor construct a feedback device. This feedback device provides a positive feedback to the differential pair in the differential mode, thereby increasing AC amplitude of the differential amplifier. Further this feedback device substantially brings the drain currents of the first current path and the second current path into coincidence in the Vcom mode.
    Type: Application
    Filed: September 8, 2004
    Publication date: February 10, 2005
    Inventor: Zhong-Ding Liu
  • Differential amplifier and comparator using the same
    Publication number: 20040201420
    Abstract: A differential amplifier. A differential pair constructed by a first transistor and the second transistor receives differential input signals. The gate terminals of a third and fourth transistor are coupled to the source terminals of the fourth transistor and the third transistor respectively, and the third and fourth transistor construct a feedback device. This feedback device provides a positive feedback to the differential pair in the differential mode, thereby increasing AC amplitude of the differential amplifier. Further this feedback device substantially brings the drain currents of the first current path and the second current path into coincidence in the Vcom mode.
    Type: Application
    Filed: April 8, 2003
    Publication date: October 14, 2004
    Inventor: Zhong-Ding Liu