Patents by Inventor Daniel Neil Ralston

Daniel Neil Ralston 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 apparatus for reduced noise and carrier feedthrough in multimode transmitter
    Patent number: 7688880
    Abstract: A high dynamic range low noise direct conversion transmitter within a multimode apparatus having multiple transmit and receive operating modes is described. The direct conversion transmitter can include a digital baseband coupled to a low noise direct conversion stage. A high dynamic range current folding digital to analog converter can be used to convert the digital baseband signals to analog representations. A wide dynamic range variable gain baseband amplifier couples the baseband signal to the direct conversion stage. A controllable passive attenuation stage operates to provide further gain control. Carrier feedthrough can be substantially eliminated using a carrier feedthrough cancellation loop that selectively utilizes one of a plurality of receivers configured for one of the multiple receive modes.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: March 30, 2010
    Assignee: Spreadtrum Communications Inc.
    Inventors: David Ryan Haub, Daniel Neil Ralston
  • METHOD AND APPARATUS FOR REDUCED NOISE AND CARRIER FEEDTHROUGH IN MULTIMODE TRANSMITTER
    Publication number: 20070280338
    Abstract: A high dynamic range low noise direct conversion transmitter within a multimode apparatus having multiple transmit and receive operating modes is described. The direct conversion transmitter can include a digital baseband coupled to a low noise direct conversion stage. A high dynamic range current folding digital to analog converter can be used to convert the digital baseband signals to analog representations. A wide dynamic range variable gain baseband amplifier couples the baseband signal to the direct conversion stage. A controllable passive attenuation stage operates to provide further gain control. Carrier feedthrough can be substantially eliminated using a carrier feedthrough cancellation loop that selectively utilizes one of a plurality of receivers configured for one of the multiple receive modes.
    Type: Application
    Filed: May 31, 2006
    Publication date: December 6, 2007
    Applicant: Quorum Systems, Inc.
    Inventors: David Ryan Haub, Daniel Neil Ralston