Communication semiconductor integrated circuit device and a wireless communication system
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United States of America Patent
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Issued Date -
May 19, 2005
app pub date -
Nov 12, 2004
filing date -
Nov 16, 2001
priority date (Note) -
Abandoned
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Abstract
A communication semiconductor integrated circuit device (200) includes an amplifier circuit (330) including a plurality of variable-gain amplifiers (PGA1-PGA3) for amplifying a received signal and a plurality of filter circuits (LPF1-LPF3), the amplifiers and the filter circuits being connected to each other in a multi-stage configuration, and a last amplifier (FFGA) having a gain set regardless of a level of a received signal and a filter circuit, the last amplifier and the filter circuit are disposed at the last stage of the amplifier circuit. The amplifier circuit has an amplification factor variable according to a level of a received signal. The communication semiconductor integrated circuit device further includes a plurality of offset correction circuits (OFC1-OFC4) for correcting direct-current offset, corresponding to the variable-gain amplifiers and the last amplifiers, respectively. The offset correction circuit (OFC4) corresponding to the last amplifier conducts an offset correction at a timing different from timing for the other offset correction circuits (OFC1-OFC3).
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