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:
Aug. 09, 2011
Filed:
Nov. 15, 2007
Koji Maeda, Kokubunji, JP;
Satoshi Tanaka, Kokubunji, JP;
Taizo Yamawaki, Tokyo, JP;
Yukinori Akamine, Kokubunji, JP;
Masahiro Ito, Kokubunji, JP;
Koji Maeda, Kokubunji, JP;
Satoshi Tanaka, Kokubunji, JP;
Taizo Yamawaki, Tokyo, JP;
Yukinori Akamine, Kokubunji, JP;
Masahiro Ito, Kokubunji, JP;
Renesas Electronics Corporation, Kawasaki-shi, JP;
Abstract
When generating an RF test signal for mismatch calibration for receiver in order to calibrate reception mismatch of an I-phase signal and a Q-phase signal that are output from demodulated signal processing circuits coupled to mixers for receiving, a Tx VCO avoids covering the higher frequency of an RF received signal in an FDD system. An RF test signal generating unit generates, in a calibration mode of a mismatch calibration for receiver circuit, the RF test signal by using an oscillation output signal of the Tx VCO and other circuits, and supplies the same to the mixers for receiving via a switch. The RF test signal has a frequency within an RF reception frequency band that is higher than that of an RF transmission signal with the maximum frequency band of multiband radio frequency communications. By switching the switch in a reception mode, an output of a low-noise amplifier that amplifies the RF received signal received by an antenna is supplied to each of the mixers for receiving.