Patents by Inventor Runhua (Ray) Sun

Runhua (Ray) Sun 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).

  • DC offset cancellation circuit for a receiver
    Patent number: 8036622
    Abstract: Techniques for cancelling DC offset are described. A DC offset cancellation circuit in a receiver cancels DC offsets caused by leaked LO (local oscillator) signals from a LO signal generator. The receiver first calibrates itself by using the DC offset cancellation circuit during a transmit mode. During the calibration, the DC offset cancellation circuit stores the DC offset voltage signal caused by the leaked LO signals. During a receiving mode when the receiver is receiving a signal, the receiver subtracts the stored DC offset voltage signal from the received signal to cancel the DC offsets caused by leaked LO signals.
    Type: Grant
    Filed: January 28, 2006
    Date of Patent: October 11, 2011
    Assignee: QUALCOMM, Incorporated
    Inventors: Runhua (Ray) Sun, Christian Holenstein, James Jaffee