The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 2009
Filed:
Jun. 02, 2005
Jesse E. Chen, Sunnyvale, CA (US);
Patrick Vandenameele, Bertem, BE;
Steven Thoen, Leuven, BE;
Alex Zenkin, Allentown, PA (US);
Pengfei Zhang, Shanghai, CN;
Peter Hanson, Fremont, CA (US);
Dmitri Varsanofiev, San Diego, CA (US);
Peter Cnudde, Sunnyvale, CA (US);
Jesse E. Chen, Sunnyvale, CA (US);
Patrick Vandenameele, Bertem, BE;
Steven Thoen, Leuven, BE;
Alex Zenkin, Allentown, PA (US);
Pengfei Zhang, Shanghai, CN;
Peter Hanson, Fremont, CA (US);
Dmitri Varsanofiev, San Diego, CA (US);
Peter Cnudde, Sunnyvale, CA (US);
RF Micro Devices, Inc., Greensboro, NC (US);
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.