Patents by Inventor Wade Leitner

Wade Leitner 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).

  • Apparatus and method for start-up circuit without a start-up resistor
    Patent number: 7554313
    Abstract: A start-up circuit is provided. In one embodiment, the start-up circuit operates as follows. In this embodiment, the start-up circuit includes a depletion-mode PMOS transistor and an NMOS switch. The NMOS switch is coupled between ground and a common gate node of a PMOS current mirror. At start-up, the depletion-mode transistor provides a DC path to pull up the gate of the NMOS switch. Accordingly, at start-up, the NMOS switch pulls the common gate of the PMOS current mirror to ground. After the PMOS current mirror begins generating current, the NMOS switch is turned off.
    Type: Grant
    Filed: February 9, 2006
    Date of Patent: June 30, 2009
    Assignee: National Semiconductor Corporation
    Inventor: Wade Leitner