RECEIVING DEVICE AND RECEIVING METHOD

WIPO Patent Application WO/2005/055450

A2

A receiving apparatus includes an amplification section that amplifies a received signal and a frequency conversion section that converts a frequency of the received signal, from a radio frequency to a baseband, the baseband having a lower frequency than the radio frequency. A gain control section amplifies, by a predetermined gain, the signal that has been subjected to the frequency conversion to the baseband. A voltage calibration section performs calibration on an offset voltage generated in the signal subjected to frequency conversion to the baseband. A time constant control section sets a first time constant during a reception operation and sets a second time constant, which is reduced with respect to the first time constant, during the calibration. A filter section passes a received signal of a predetermined band, with the first time constant or the second time constant, an operation control section stops operation of the amplification section during the calibration, controls the amplification section to operate during the reception operation, and controls the operation of the amplification section so as to reduce a residual offset voltage caused by switching the operation of the amplification section.

JP5092282	Receiver
JP2003078434	DIRECT CONVERSION RECEIVER
JP2011217221	TWO OUTPUT ORTHOGONAL LOCAL SIGNAL OSCILLATOR

SHIMIZU YOSHITO
WATANABE TAKEAKI
SAITO NORIAKI

PCT/JP2004/017784

June 16, 2005

November 30, 2004

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MATSUSHITA ELECTRIC IND CO LTD (JP)
SHIMIZU YOSHITO
WATANABE TAKEAKI
SAITO NORIAKI

H04B1/30; H04L27/22; (IPC1-7): H04B1/30; H04L27/22

Washida, Kimihito (Shintoshicenter Bldg. 24-1, Tsurumaki 1-chom, Tama-shi Tokyo 34, JP)

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