Patents by Inventor Kunhong Qu

Kunhong Qu 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).

  • Method and device for white level calibration
    Patent number: 7889251
    Abstract: Calibrating a white level in an image scanning device. A target white level is accessed. A high white level is determined for pixel data output by an amplifier. A gain adjustment to the amplifier is determined to correct a portion of an error between the target white level and the high white level. The gain adjustment is applied to the amplifier.
    Type: Grant
    Filed: June 8, 2005
    Date of Patent: February 15, 2011
    Assignee: National Semiconductor Corporation
    Inventors: Chung Wai Ng, David Boisvert, Kunhong Qu, Mehmet Aslan
  • Apparatus and method for ping-pong mismatch correction
    Patent number: 7236117
    Abstract: An analog front-end (AFE) circuit may include a correlated double sampler (CDS) with a ping-pong architecture, and a ping-pong mismatch correction circuit. The CDS employs a ping data path during ping phases, and employs a pong data path during pong phases. The ping-pong mismatch correction circuit is arranged to correct a mismatch between a gain that is associated with the ping data path and a gain that is associated with the pong data path. Further, the ping-pong mismatch correction circuit is arranged to correct a mismatch between an offset that is associated with the ping data path and an offset that is associated with the pong data path.
    Type: Grant
    Filed: July 20, 2004
    Date of Patent: June 26, 2007
    Assignee: National Semiconductor Corporation
    Inventors: Seema Varma, Ha Chu Vu, Kunhong Qu, William David Llewellyn, Chungwai Benedict Ng, Nghiem Nguyen