Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2008-03-18
2008-03-18
Vuong, Quochien B. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S063100, C455S067130, C375S346000
Reexamination Certificate
active
07346325
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.
REFERENCES:
patent: 7146146 (2006-12-01), Masenten et al.
patent: 7158586 (2007-01-01), Husted
patent: 7254379 (2007-08-01), Xu et al.
patent: 2004-040678 (2004-02-01), None
Akamine Yukinori
Kawabe Manabu
Kyu Irei
Maeda Koji
Tanaka Satoshi
Miles & Stockbridge P.C.
Renesas Technology Corp.
Vuong Quochien B.
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