Patents by Inventor Loi Thanh Le

Loi Thanh Le 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).

  • Power down circuit for high output impedance state of I/O driver
    Patent number: 6597222
    Abstract: A circuit for putting an output driver into a high impedance state upon failure of the power supply. This is accomplished by providing a first transistor that is connected between the power supply and the n-well to charge the n-well node of the PMOS drive transistor. Upon failure of the supply voltage, a number of transistors are connected to couple the n-well and a gate of the PMOS drive transistor to the output line, so that they track the voltage level of the output, thereby preventing forward biasing of the P+/n-well diode.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: July 22, 2003
    Assignee: Exar Corporation
    Inventors: Loi Thanh Le, Pekka Ojala, Bahram Fotouhi
  • POWER DOWN CIRCUIT FOR HIGH OUTPUT IMPEDENCE STATE OF I/O DRIVER
    Publication number: 20030071660
    Abstract: A circuit for putting an output driver into a high impedance state upon failure of the power supply. This is accomplished by providing a first transistor that is connected between the power supply and the n-well to charge the n-well node of the PMOS drive transistor. Upon failure of the supply voltage, a number of transistors are connected to couple the n-well and a gate of the PMOS drive transistor to the output line, so that they track the voltage level of the output, thereby preventing forward biasing of the P+/n-well diode.
    Type: Application
    Filed: October 15, 2001
    Publication date: April 17, 2003
    Applicant: Exar Corporation
    Inventors: Loi Thanh Le, Pekka Ojala, Bahram Fotouhi