Patent ID: 7995982

Claim:
A semiconductor integrated circuit comprising: an RF receiver for processing an RF reception signal received by an antenna; an RF transmitter for generating an RF transmission signal transmitted from the antenna; a frequency synthesizer for generating reception local signals supplied to the RF receiver and transmission local signals supplied to the RF transmitter; said RF receiver including a low noise amplifier for amplifying the RF reception signal, a reception mixer supplied with an RF amplified signal corresponding to an output of the low noise amplifier and the reception local signals, and a reception low-pass filter supplied with downconvert signals generated from the reception mixer; said downconvert signals being a pair of downconvert signals and said reception low-pass filter including a pair of reception low-pass filters supplied with the downconvert signals; a signal supply unit for supplying a calibration test signal to a pair of input terminals of the reception low-pass filters during an operation for calibration; a phase detection unit for detecting a difference in phase between signals at a pair of output terminals of the reception low-pass filters during the calibration operation; and a calibration controller for calibrating a relative mismatch between cut-off frequencies of the reception low-pass filters in response to the output of the phase detection unit during the calibration operation.