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:
May. 05, 2015
Filed:
Apr. 24, 2013
Mstar Semiconductor, Inc., Hsinchu Hsien, TW;
Wael Al-Qaq, Oak Ridge, NC (US);
Ryan L. Bunch, Greensboro, NC (US);
Dennis Mahoney, Greensboro, NC (US);
Paul Brey, Chapel Hill, NC (US);
MStar Semiconductor, Inc., Hsinchu Hsien, TW;
Abstract
Local oscillator (LO) in-phase/quadrature (IQ) imbalance correction data are generated for one or both of the transmitter and receiver of a radio-frequency (RF) communication device. An RF transmitter output signal is generated by the transmitter from a known test signal and transmitted to the receiver, where a baseband receiver signal is produced. A signal characteristic of the receiver baseband signal is measured in the presence of phase shifts introduced in the transmitter output signal. Joint LO IQ imbalance figures of merit are computed from the signal characteristic measurements, each characterizing signal processing artifacts in the receiver baseband signal caused by joint signal processing in the transmitter and the receiver under influence of transmitter LO IQ imbalance and receiver LO IQ imbalance. The LO IQ imbalance correction data are determined from the computed JFMs so that the transmitter LO IQ imbalance is distinctly characterized from the receiver LO IQ imbalance from measurements obtained through no greater than two (2) phase shifts.