发明名称 COMMUNICATION CIRCUIT DEVICE
摘要 <P>PROBLEM TO BE SOLVED: To provide a communication circuit device for reducing or eliminating a supurious without complicating a circuit construction or increasing a circuit area. <P>SOLUTION: The communication circuit device is provided with a fractional N type frequency synthesizer 12b generating many kinds of oscillation signals having different oscillation frequencies, and a reception circuit part 10 which has a frequency conversion circuit 12 for using the oscillation frequency to convert a carrier frequency into an intermediate frequency and a control circuit 30 for setting the oscillation frequency in accordance with the carrier frequency so that the intermediate frequency becomes a first intermediate frequency. The control circuit 30 is provided with: an offset frequency calculating means 31 for calculating an offset frequency on the basis of the carrier frequency and the oscillation frequency; an oscillation frequency calculating means 32 for obtaining a specific value of the oscillation frequency where the offset frequency is outside a determination frequency range on the basis of the carrier frequency; and a frequency resetting means 33 for adjusting the oscillation frequency to the specific value to convert the intermediate frequency into a second intermediate frequency other than the first intermediate frequency. <P>COPYRIGHT: (C)2009,JPO&INPIT
申请公布号 JP2009088605(A) 申请公布日期 2009.04.23
申请号 JP20070251695 申请日期 2007.09.27
申请人 SHARP CORP 发明人 HAMAGUCHI MUTSUMI
分类号 H04B1/26;H03L7/183;H03L7/197 主分类号 H04B1/26
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