Patents by Inventor Alex Zenkin

Alex Zenkin 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).

  • I/Q mismatch calibration of direct conversion receivers using radio frequency noise
    Patent number: 7496340
    Abstract: A system and method are provided for calibrating for an I/Q mismatch of a direct conversion receiver based on a random signal having a two-dimensional I versus Q trajectory, such as radio frequency (RF) noise. In general, the random signal is received and downconverted to a quadrature baseband signal having an in-phase component and a quadrature component. The variance of the in-phase component, the variance of the quadrature component, and the covariance of the in-phase component with the quadrature component are computed based on samples of the quadrature baseband signal. A correction matrix used to compensate for the I/Q mismatch of the receiver and/or I/Q mismatch including a gain mismatch and a phase mismatch of the receiver is then computed based on the variance of the in-phase component, the variance of the quadrature component, and the covariance of the in-phase component with the quadrature component.
    Type: Grant
    Filed: June 2, 2005
    Date of Patent: February 24, 2009
    Assignee: RF Micro Devices, Inc.
    Inventors: Jesse E. Chen, Patrick Vandenameele, Steven Thoen, Alex Zenkin, Pengfei Zhang, Peter Hanson, Dmitri Varsanofiev, Peter Cnudde