Patents by Inventor Asad Ullah Aman

Asad Ullah Aman 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).

  • Digital predistortion system for linearizing a power amplifier
    Patent number: 6937669
    Abstract: A predistortion linear power amplifier utilizes several predistortion computation engines to receive a first carrier signal. The predistortion computation engines also receive input from a predistortion algorithm engine. The predistortion algorithm engine receives its data from a predistortion amplifier sensor that monitors the operating characteristics of the amplifier and also from a feedback control circuit that provides frequency correlated input and feedback data. The processed data from the predistortion algorithm engine is then input into the predistortion computation engine along with the carrier signal. An output combiner circuit takes the output of each predistortion computation engine and generates a single correction estimate, which is then input into the nonlinear amplifier for producing a substantially linear output signal.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: August 30, 2005
    Assignee: Motorola, Inc.
    Inventors: Andrew T. Tomerlin, Asad Ullah Aman, Robert V. Stephens
  • Digital predistortion system for linearizing a power amplifier
    Publication number: 20040105510
    Abstract: A predistortion linear power amplifier utilizes several predistortion computation engines to receive a first carrier signal. The predistortion computation engines also receive input from a predistortion algorithm engine. The predistortion algorithm engine receives its data from a predistortion amplifier sensor that monitors the operating characteristics of the amplifier and also from a feedback control circuit that provides frequency correlated input and feedback data. The processed data from the predistortion algorithm engine is then input into the predistortion computation engine along with the carrier signal. An output combiner circuit takes the output of each predistortion computation engine and generates a single correction estimate, which is then input into the nonlinear amplifier for producing a substantially linear output signal.
    Type: Application
    Filed: December 3, 2002
    Publication date: June 3, 2004
    Applicant: Motorola, Inc.
    Inventors: Andrew T. Tomerlin, Asad Ullah Aman, Robert V. Stephens