Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2005-04-28
2009-12-22
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S316000, C455S130000, C455S296000
Reexamination Certificate
active
07636405
ABSTRACT:
A method and device for calibrating in-phase and quadrature-phase (IQ) mismatch. The device is used in a direct down-conversion circuit of a communication system. The device has a first mixer for mixing an RF signal with a first carrier signal, so as to generate an in-phase analog signal; a second mixer for mixing the RF signal with a second carrier signal, so as to generate a quadrature-phase analog signal; an operation unit for executing a Least Mean Square (LMS) algorithm and thereby generating a compensation signal according to the in-phase analog signal and the quadrature-phase analog signal; and a calibration unit for compensating the in-phase analog signal and the quadrature-phase analog signal according to the compensation signal, so as to calibrate the IQ mismatch between the in-phase analog signal and the quadrature-phase analog signal.
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Lee Chao-Cheng
Lin Ying-Hsi
Lin Ying-Yao
Flores Leon
Hsu Winston
Liu Shuwang
Realtek Semiconductor Corp.
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