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    DIGITAL RECEPTION DEVICE
    6.
    发明公开
    DIGITAL RECEPTION DEVICE 审中-公开
    数字接收机

    公开(公告)号：EP1976127A4

    公开(公告)日：2009-03-25

    申请号：EP06833619

    申请日：2006-11-29

    申请人： PIONEER CORP

    发明人： YAMAMOTO YUJI

    IPC分类号： H03M3/02 ,  H03F3/70 ,  H03G3/30 ,  H03M1/18 ,  H04B1/16

    CPC分类号： H03F3/2175 ,  H03M3/482 ,  H03M3/49 ,  H03M3/492

    摘要： A digital reception device includes a band pass type delta sigma A/D converter for performing analog-digital conversion for converting a signal to be modulated in an analog region into a signal in the digital region. It is possible to reduce the thermal noise and power consumption of the band pass type delta signal A/D converter. The digital reception device includes a signal level detection unit (9a) for detecting the level of the IF signal SIF and a current control unit (10) for adjusting, according to the detection result DETa, operation current of a calculation amplifier as delay means as one of the components of a switched capacitor filter (7b) arranged in the band pass type delta sigma A/D converter (7). As the electric field intensity induced by an antenna (1) becomes smaller and the level of the IF signal SIF becomes lower, the operation current of the calculation amplifier is made smaller so as to reduce power consumption. As the electric field intensity induced by the antenna (1) becomes greater and the level of the IF signal SIF becomes greater, the operation current of the calculation amplifier is made greater so as to reduce the thermal noise.