Patents Represented by Attorney Philip R. Wadswort

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  • Method and apparatus for obtaining transmit diversity using switched antennas
    Patent number: 7031398
    Abstract: A method and apparatus for providing diversity transmissions to a mobile unit from a transmitting station having at least first and second antennas by repeatedly switching between the two antennas during the transmission of information to the receiving unit. Message information is transmitted from the first antenna in the transmitting station to the receiving unit. After the start of the transmission of the message information from the first antenna, transmission of the message information from the first antenna to the receiving unit terminates and transmission of the message information from the second antenna in the transmitting station to the receiving unit is initiated. Some time after transmission of the message information from second antenna is initiated, the transmission of the message information from the second antenna to the receiving unit terminates and transmission of the message information from the first antenna in the transmitting station to the receiving unit is initiated.
    Type: Grant
    Filed: August 6, 2004
    Date of Patent: April 18, 2006
    Assignee: Qualcomm Incorporated
    Inventors: Joseph P. Odenwalder, Stein A. Lundby, Charles E. Wheatley, III, Edward G. Tiedemann, Jr.
  • Digital to analog converter augmented with direct charge transfer techniques
    Patent number: 6956515
    Abstract: A digital to analog converter augmented with Direct Charge Transfer (DCT) techniques. A digital to analog converter augmented with DCT and CDS techniques. A digital to analog converter augmented with Postfilter Droop Compensation.
    Type: Grant
    Filed: June 17, 2003
    Date of Patent: October 18, 2005
    Assignee: QUALCOMM, Incorporated
    Inventors: Edward A. Keehr, Sean Wang, Seyfollah Bazarjani