Patents by Inventor Mahta Jenabi

Mahta Jenabi 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).

  • Quadrature modulator and calibration method
    Patent number: 7893758
    Abstract: A quadrature modulator and a method of calibrating same by applying a first test tone signal to an in-phase modulation branch input of the modulator and a ninety degree phase-shifted version of the first test tone signal to a quadrature modulation branch input of the modulator. The carrier leakage level in an output signal of the modulator is measured and in response base band dc offset voltages are adjusted to minimize the carrier leakage. A second test tone signal is applied to the in-phase modulation branch input and a ninety degree phase-shifted version of the second test tone signal to the quadrature modulation branch input. The level of an undesired upper sideband frequency component in the output signal is measured and in response base band gains the in-phase and quadrature modulation branches and a local oscillator phase error are adjusted to minimize the undesired side band.
    Type: Grant
    Filed: June 15, 2009
    Date of Patent: February 22, 2011
    Assignee: ST-Ericsson SA
    Inventors: Ali Parsa, Ali Fotowat-Ahmady, Ali Faghfuri, Mahta Jenabi, Emmanuel Riou, Wilhelm Steffen Hahn
  • QUADRATURE MODULATOR AND CALIBRATION METHOD
    Publication number: 20090267701
    Abstract: A quadrature modulator and a method of calibrating same by applying a first test tone signal to an in-phase modulation branch input of the modulator and a ninety degree phase-shifted version of the first test tone signal to a quadrature modulation branch input of the modulator. The carrier leakage level in an output signal of the modulator is measured and in response base band dc offset voltages are adjusted to minimize the carrier leakage. A second test tone signal is applied to the in-phase modulation branch input and a ninety degree phase-shifted version of the second test tone signal to the quadrature modulation branch input. The level of an undesired upper sideband frequency component in the output signal is measured and in response base band gains the in-phase and quadrature modulation branches and a local oscillator phase error are adjusted to minimize the undesired side band.
    Type: Application
    Filed: June 15, 2009
    Publication date: October 29, 2009
    Inventors: Ali Parsa, Ali Fotowat-Ahmady, Ali Faghfuri, Mahta Jenabi, Emmanuel Riou, Wilhelm Steffen Hahn
  • Quadrature modulator and calibration method
    Patent number: 7548591
    Abstract: A quadrature modulator and a method of calibrating same by applying a first test tone signal to an in-phase modulation branch input of the modulator and a ninety degree phase-shifted version of the first test tone signal to a quadrature modulation branch input of the modulator. The carrier leakage level in an output signal of the modulator is measured and in response base band dc offset voltages are adjusted to minimize the carrier leakage. A second test tone signal is applied to the in-phase modulation branch input and a ninety degree phase-shifted version of the second test tone signal to the quadrature modulation branch input. The level of an undesired upper sideband frequency component in the output signal is measured and in response base band gains the in-phase and quadrature modulation branches and a local oscillator phase error are adjusted to minimize the undesired sideband.
    Type: Grant
    Filed: April 20, 2004
    Date of Patent: June 16, 2009
    Assignee: NXP B.V.
    Inventors: Ali Parsa, Ali Fotowat-Ahmady, Ali Faghfuri, Mahta Jenabi, Emmanuel Riou, Wilhelm Steffen Hahn
  • Quadrature modulator and calibration method
    Publication number: 20060208820
    Abstract: A quadrature modulator and a method of calibrating same by applying a first test tone signal to an in-phase modulation branch input of the modulator and a ninety degree phase-shifted version of the first test tone signal to a quadrature modulation branch input of the modulator. The carrier leakage level in an output signal of the modulator is measured and in response base band dc offset voltages are adjusted to minimize the carrier leakage. A second test tone signal is applied to the in-phase modulation branch input and a ninety degree phase-shifted version of the second test tone signal to the quadrature modulation branch input. The level of an undesired upper sideband frequency component in the output signal is measured and in response base band gains the in-phase and quadrature modulation branches and a local oscillator phase error are adjusted to minimize the undesired sideband.
    Type: Application
    Filed: April 20, 2004
    Publication date: September 21, 2006
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Ali Parsa, Ali Fotowat-Ahmady, Ali Faghfuri, Mahta Jenabi, Emmanuel Riou, Wilhelm Hahn