Patent ID: 8238864
Filing Date: 2012-08-07
Classification: H04B

Abstract:
1. A semiconductor integrated circuit that processes an RF reception signal received by an antenna, the semiconductor integrated circuit comprising: a frequency synthesizer that generates reception local signals; a low noise amplifier that amplifies 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; a reception low-pass filter supplied with downconvert signals generated from the reception mixer, the downconvert signals being a pair of downconvert signals, and the reception low-pass filter including a pair of reception low-pass filters supplied with the downconvert signals; a signal supply unit that supplies a calibration test signal to a pair of input terminals of the reception low-pass filters during a calibration operation; a phase detection unit that detects 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 that calibrates 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.