Patents by Inventor Sherry Xiao hong Wu

Sherry Xiao hong Wu 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).

  • Switched-capacitor circuits with reduced distortion
    Patent number: 6617908
    Abstract: A switched capacitor circuit 300, including a sampling capacitor 303, switches 301, 304 for charging the sampling capacitor 303 during a charging phase, and switches 302, 305 for transferring charge from the sampling capacitor 303 to a load 313 in the feedback loop of an operational amplifier 312 during a dump phase. Circuitry 701 controls the discharge of sampling capacitor 303 during the dump phase to minimize transients at the input of the operational amplifier 312 and thereby minimize input threshold voltage variation.
    Type: Grant
    Filed: March 22, 2002
    Date of Patent: September 9, 2003
    Assignee: Cirrus Logic, Inc.
    Inventors: Axel Thomsen, Sherry Xiao hong Wu, John Laurence Melanson