Patents by Inventor Wu-Sung Li

Wu-Sung Li 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).

  • Level shifter circuit
    Patent number: 7710151
    Abstract: A level shifter circuit includes a level shifter, an inverter, a first switch circuit and a second switch circuit. The level shifter includes a first transistor, a second transistor, a third transistor and a fourth transistor. The inverter receives an input signal and thus generates an inversion input signal. The first transistor and the second transistor are respectively controlled by the input signal and an output signal to output an inversion output signal. The third transistor and the fourth transistor are respectively controlled by the inversion input signal and the inversion output signal to output an output signal. The first switch circuit is coupled to the level shifter and turns off the fourth transistor when the third transistor is turned on. The second switch circuit is coupled to the level shifter, and turns off the second transistor when the first transistor is turned on.
    Type: Grant
    Filed: October 23, 2008
    Date of Patent: May 4, 2010
    Assignee: Raydium Semiconductor Corporation
    Inventors: Kei-Kang Hung, Wu-Sung Li
  • LEVEL SHIFTER CIRCUIT
    Publication number: 20090230991
    Abstract: A level shifter circuit includes a level shifter, an inverter, a first switch circuit and a second switch circuit. The level shifter includes a first transistor, a second transistor, a third transistor and a fourth transistor. The inverter receives an input signal and thus generates an inversion input signal. The first transistor and the second transistor are respectively controlled by the input signal and an output signal to output an inversion output signal. The third transistor and the fourth transistor are respectively controlled by the inversion input signal and the inversion output signal to output an output signal. The first switch circuit is coupled to the level shifter and turns off the fourth transistor when the third transistor is turned on. The second switch circuit is coupled to the level shifter, and turns off the second transistor when the first transistor is turned on.
    Type: Application
    Filed: October 23, 2008
    Publication date: September 17, 2009
    Inventors: Kei-Kang HUNG, Wu-Sung Li