Patents by Inventor Chung-Pei Tsai

Chung-Pei Tsai 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).

  • Hysteresis circuit used in comparator
    Patent number: 6940329
    Abstract: A hysteresis circuit for use in a comparator having a first and a second transistors as an input stage and a constant current source. The hysteresis circuit comprises a first resistor disposed between a source of the first transistor and the constant current source and a second resistor disposed between a source of the second transistor and the constant current source, and comprises a first and a second current generating means. The first current generating means supplies a current to the source of the first transistor and derives a current out from the source of the second transistor if an output signal of the comparator is a first logic value, while the second current generating means supplies a current to the source of the second transistor and derives a current out from the source of the first transistor if the output signal of the comparator is a second logic value.
    Type: Grant
    Filed: April 12, 2004
    Date of Patent: September 6, 2005
    Assignee: Prolific Technology Inc.
    Inventors: Chung-Pei Tsai, Yi-Min Wu
  • Hysteresis circuits used in comparator
    Publication number: 20050046447
    Abstract: A hysteresis circuit for use in a comparator having a first and a second transistors as an input stage and a constant current source. The hysteresis circuit comprises a first resistor disposed between a source of the first transistor and the constant current source and a second resistor disposed between a source of the second transistor and the constant current source, and comprises a first and a second current generating means. The first current generating means supplies a current to the source of the first transistor and derives a current out from the source of the second transistor if an output signal of the comparator is a first logic value, while the second current generating means supplies a current to the source of the second transistor and derives a current out from the source of the first transistor if the output signal of the comparator is a second logic value.
    Type: Application
    Filed: April 12, 2004
    Publication date: March 3, 2005
    Inventors: Chung-Pei Tsai, Yi-Min Wu