Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2011-08-09
2011-08-09
Huang, Wen (Department: 2618)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S067110, C455S115100, C455S226100
Reexamination Certificate
active
07996003
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.
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Akamine Yukinori
Ito Masahiro
Maeda Koji
Tanaka Satoshi
Yamawaki Taizo
Huang Wen
Miles & Stockbridge P.C.
Renesas Electronics Corporation
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