Patents by Inventor Axel Erich Schuur

Axel Erich Schuur 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).

  • Calibration of in-phase and quadrature transmit branches of a transmitter
    Patent number: 6704551
    Abstract: In a method of calibrating a quadrature transmitter, a first calibration signal is injected into an in-phase transmit branch of the quadrature transmitter, and a second calibration signal is injected into a quadrature transmit branch of the quadrature transmitter. The first and second calibration signals are injected before performing up-conversion in the transmitter and are produced by first and second digital signals. A detector detects an up-converted signal. The detected up-converted signal is digitized. The in-phase and quadrature transmit branches are calibrated by alternately determining the first and second calibration signals while at least varying respective most significant bits of the first and second digital signals, upon said varying the at least most significant bits keeping calibration bit values that correspond to minimum values of the digitized detected up-converted signal.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: March 9, 2004
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Emmanuel Riou, Willhelm Steffen Hahn, Axel Erich Schuur
  • Calibration of in-phase and quadrature transmit branches of a transmitter
    Publication number: 20020115416
    Abstract: In a method of calibrating a quadrature transmitter, a first calibration signal is injected into an in-phase transmit branch of the quadrature transmitter, and a second calibration signal is injected into a quadrature transmit branch of the quadrature transmitter. The first and second calibration signals are injected before performing up-conversion in the transmitter and are produced by first and second digital signals. A detector detects an up-converted signal. The detected up-converted signal is digitized. The in-phase and quadrature transmit branches are calibrated by alternately determining the first and second calibration signals while at least varying respective most significant bits of the first and second digital signals, upon said varying the at least most significant bits keeping calibration bit values that correspond to minimum values of the digitized detected up-converted signal.
    Type: Application
    Filed: February 21, 2001
    Publication date: August 22, 2002
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Emmanuel Riou, Willhelm Steffen Hahn, Axel Erich Schuur