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. 20, 2007
Filed:
Sep. 16, 2004
Baker Scott, Boulder, CO (US);
David Reed, Westminster, CO (US);
Robert Grant Irvine, Greensboro, NC (US);
Feng Wang, Jamestown, NC (US);
Baker Scott, Boulder, CO (US);
David Reed, Westminster, CO (US);
Robert Grant Irvine, Greensboro, NC (US);
Feng Wang, Jamestown, NC (US);
RF Micro Devices, Inc., Greensboro, NC (US);
Abstract
The amplitude and phase errors of the modulation and demodulation in a transceiver are corrected by a self-calibration procedure in which a test signal is applied to the baseband input of the transmitter, and the output of the modulator is looped back to the input of the demodulator. The amplitude and phase errors of the resulting signal at the baseband output of the receiver are detected, and the contributions of the transmitter and receiver to the errors are separated and resolved into amplitude and phase components. Adjustments are then made to the amplitude and phase balance in the transmit and receive signal paths to correct the errors.