Patents by Inventor Chinghsiu Shih

Chinghsiu Shih 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).

  • Systems and methods for coherent adaptive calibration in a receiver
    Patent number: 7146146
    Abstract: An improved calibration system for a receiver is configured to calibrate the I and Q paths to correct for gain mismatch and quadrature phase errors. In a preferred embodiment, the calibration system calibrates the I and Q paths by using a calibration signal and a reference signal coherently generated from the same single frequency source. The calibration signal is input into the receiver and propagated along the I and Q paths of the receiver simultaneously with a received signal. The reference signal coherently extracts the calibration signal from the I and Q paths. The resulting calibration signals include a component at zero frequency that can be used to measure the phase and gain error. The calibration system is configured to adaptively calibrate the gain and phase error by iteratively measuring the gain and phase error and reducing it to the desired level or eliminating it altogether.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: December 5, 2006
    Assignee: DiTrans IP, Inc.
    Inventors: Wesley K. Masenten, Peggy L. Escobedo, Chinghsiu Shih, Erik C. Fountain, Robert A. Dell-Imagine
  • Systems and methods for coherent adaptive calibration in a receiver
    Publication number: 20040152436
    Abstract: An improved calibration system for a receiver is configured to calibrate the I and Q paths to correct for gain mismatch and quadrature phase errors. In a preferred embodiment, the calibration system calibrates the I and Q paths by using a calibration signal and a reference signal coherently generated from the same single frequency source. The calibration signal is input into the receiver and propagated along the I and Q paths of the receiver simultaneously with a received signal. The reference signal coherently extracts the calibration signal from the I and Q paths. The resulting calibration signals include a component at zero frequency that can be used to measure the phase and gain error. The calibration system is configured to adaptively calibrate the gain and phase error by iteratively measuring the gain and phase error and reducing it to the desired level or eliminating it altogether.
    Type: Application
    Filed: January 31, 2003
    Publication date: August 5, 2004
    Applicant: Ditrans Corporation
    Inventors: Wesley K. Masenten, Peggy L. Escobedo, Chinghsiu Shih, Erik C. Fountain, Robert A. Dell-Imagine