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:
Mar. 18, 2008
Filed:
Jul. 13, 2005
Koji Maeda, Kokubunji, JP;
Satoshi Tanaka, Kokubunji, JP;
Irei Kyu, Kokubunji, JP;
Yukinori Akamine, Kokubunji, JP;
Manabu Kawabe, Hachioji, JP;
Koji Maeda, Kokubunji, JP;
Satoshi Tanaka, Kokubunji, JP;
Irei Kyu, Kokubunji, JP;
Yukinori Akamine, Kokubunji, JP;
Manabu Kawabe, Hachioji, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
This invention provides a receiver in which the calibration time by repeated operations to correct phase mismatch and amplitude mismatch between I and Q signals can be reduced. The receiver comprises mixers which convert received RF signals into quadrature modulated IF signals, signal paths which filter and amplify and output the quadrature modulated signals output from the mixers, a calibration circuit which calibrates phase and amplitude mismatches between the I and Q components of the quadrature modulated signals output through the signal paths, a frequency converter which, when the mixers or the signal paths selected output calibration signals with IF frequency instead of the quadrature modulated signals, converts the calibration signals into those with a frequency higher than IF frequency, and an arithmetic operation circuit which calculates phase and amplitude mismatches from the calibration signals output by the frequency converter and outputs calculation results. The calibration circuit executes calibration, using the calculation results.