Patents by Inventor Tuofu Lu

Tuofu Lu 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).

  • System and method for providing open loop transmit power control
    Patent number: 8447249
    Abstract: This disclosure is directed to systems and methods that provide control of transmitted signal power that do not require the use of an external power detector. By determining the expected transmit power based upon conditions such as temperature or voltage, the settings of the transmitters amplifier can be adjusted to more closely match the desired transmit power.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: May 21, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Tuofu Lu, Kai Shi, Richard T. Chang, Sang-Min Lee, Joe I. Jamp, Paul J. Husted, Praveen Dua
  • Method and apparatus for offset and gain compensation for analog-to-digital converters
    Patent number: 7541952
    Abstract: A method for determining a gain compensation value for multiple ADCs sums an absolute value of a number of ADC output samples from each of the ADCs that may be collected while the ADCs are in normal operation. In one embodiment, the ratio of the sums of the absolute values of ADC output samples may reflect the difference in gains between the ADCs, and may be used to determine the ADC gain compensation value. A method for determining an offset compensation value between for multiple ADCs averages of a number of ADC output samples from each ADC collected while the ADCs are in normal operation. In one embodiment, a difference between the ADC sample averages may reflect the difference in magnitudes of the ADC offsets for each ADC, and may be used to determine the ADC offset compensation value.
    Type: Grant
    Filed: October 10, 2007
    Date of Patent: June 2, 2009
    Assignee: Atheros Communications, Inc.
    Inventors: Sundar Sankaran, Tuofu Lu