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    • 46. 发明申请
    • DIRECT CONVERSION RECEIVERS AND FILTERS ADAPTED FOR USE THEREIN
    • 直接转换接收器和适配器使用的滤波器
    • WO01024352A1
    • 2001-04-05
    • PCT/US2000/026741
    • 2000-09-28
    • H03H11/04H03H11/12H04B1/30H03B1/00H04B1/10
    • H03H11/1217H04B1/30
    • A direct conversion receiver (10) having a homodyning section (12) and a filter (18). The filter (18) includes a plurality of serially coupled high pass filter stages (20(1)-20(n)). The high pass filter section (18) act as a dc offset correction loop. The plurality of high pass filter stages (20(1)-20(n)) also enables the integration of the needed capacitors thus minimizing external components and connections. Each one of the filter stages includes an amplifier (22) and a low pass filter (24). Each one of the low pass filters (24) is adapted to have the cutoff frequency thereof switch from an initial high cutoff frequency to a subsequent lower cutoff frequency. A high pass filter stage (20(1)-20(n)) of a direct conversion receiver (10) is provided which includes in a low pass filter feedback section (24) thereof: a capacitor (C) and a resistor section (30). The resistor section (30) includes a switch for changing the resistance of the resistance section. A switching arrangement (32) is included for charging the capacitor (C) rapidly during an initial, start-up time period or after a large step change in the gain of the amplifier (22).
    • 具有校零部分(12)和过滤器(18)的直接转换接收器(10)。 滤波器(18)包括多个串联耦合的高通滤波器级(20(1)-20(n))。 高通滤波器部分(18)用作直流偏移校正回路。 多个高通滤波器级(20(1)-20(n))还使得能够集成所需的电容器,从而最小化外部元件和连接。 滤波器级中的每一个包括放大器(22)和低通滤波器(24)。 低通滤波器(24)中的每一个适于使其截止频率从初始高截止频率切换到随后的较低截止频率。 提供了一种直接转换接收器(10)的高通滤波器级(20(1)-20(n)),其包括在其低通滤波器反馈部分(24)中:电容器(C)和电阻器部分 30)。 电阻器部分(30)包括用于改变电阻部分的电阻的开关。 包括开关装置(32),用于在初始,启动时间段期间或在放大器(22)的增益的大幅度变化之后快速地对电容器(C)充电。