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    • 17. 发明申请
    • Carrier detecting circuit and infrared communication device using same
    • 载波检测电路和红外通信装置使用相同
    • US20050003786A1
    • 2005-01-06
    • US10868810
    • 2004-06-17
    • Takahiro InoueNoboru Takeuchi
    • Takahiro InoueNoboru Takeuchi
    • H03D1/10H03G3/30H04L27/06H04B1/06H04B1/16H04B7/00
    • H03G3/3084
    • A conventional carrier detecting circuit which generates a carrier detection level by integral action based on a reception signal and detects using the carrier detection level whether a carrier exists is arranged to charge and discharge in the following manner, an integration capacitor in an integrator that performs the integral action. Namely, the integration capacitor is (i) either charged or discharged in accordance with a result of the discrimination of the reception signal at the carrier detection level, or (ii) charged in accordance with the result of the discrimination while the integration capacitor is constantly discharged at a constant level. In contrast, a carrier detecting circuit of the present invention is arranged so that the integration capacitor is both charged and discharged constantly at a level that varies in accordance with the result of the discrimination. In other words, the integration capacitor is charged and discharged using a difference current between a current charged from a charging circuit and a current discharged to a discharging circuit. With this, it is possible to reduce the chip area without causing problems due to the reduction of the currents flowing through the transistors.
    • 通过基于接收信号的积分动作生成载波检测电平的传统载波检测电路,并且使用载波检测电平检测是否存在载波被布置为以下列方式对放电进行充放电:积分器中的积分电容器执行 积分行动。 也就是说,积分电容器是(i)根据载波检测电平的接收信号的鉴别结果进行充电或放电,或者(ii)在积分电容器不断地根据判别结果进行充电的情况下 以恒定水平排放。 相反,本发明的载波检测电路被布置成使得积分电容器被以恒定的方式被充放电,其电平根据鉴别结果而变化。 换句话说,使用从充电电路充电的电流与放电电路放电的电流之间的差电流对积分电容器进行充放电。 由此,可以减少芯片面积而不会由于流过晶体管的电流的减少而引起问题。