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. 10, 2016
Filed:
Jul. 25, 2013
Mstar Semiconductor, Inc., Hsinchu Hsien, TW;
Yuan-Yu Fu, Hsinchu County, TW;
MSTAR SEMICONDUCTOR, INC., Hsinchu Hsien, TW;
Abstract
A second-order intermodulation distortion calibration apparatus is provided. The calibration apparatus is applied to a radio-frequency (RF) transceiver, which includes a transmitter for providing an RF signal, and a receiver that is at the same time a target to be calibrated. The calibration apparatus includes a calibrator. The calibrator utilizes a logic circuit in the transmitter to generate two modulation signals having different frequencies, and utilizes two transmission paths to up-convert and combine the two modulation signals to an RF transmission signal. The calibrator further channels the RF transmission signal to the receiver to accordingly adjust second-order non-linear behaviors of the receiver and to detect a signal strength of a second-order crossover component caused by the receiver due to the second-order non-linearity. After the calibration process, the calibrator provides a control signal to minimize the signal strength of the second-order crossover component.