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    • 24. 发明授权
    • Amplifying apparatus for a mobile station receiver and method for controlling the same
    • 移动台接收机的放大装置及其控制方法
    • US06496072B2
    • 2002-12-17
    • US09752707
    • 2000-12-28
    • Seung-Ki ChoYong-Seong JeongSang-Yong YangWoo-Yong LeeJae-Min Lee
    • Seung-Ki ChoYong-Seong JeongSang-Yong YangWoo-Yong LeeJae-Min Lee
    • H03G310
    • H03G1/0088
    • An amplifying apparatus for a mobile station receiver is disclosed. A low-noise amplifier amplifies a received signal to a preset level. A controller detects a level of a signal corresponding to a first frame of the received signal output from the low-noise amplifier, and generates a control voltage according to the detected level. An attenuation determining resistor determines an attenuation of the received signal. A first switching element is connected in series to the attenuation determining resistor, and is turned ON according to the control voltage so as to attenuate the received signal through the attenuation determining resistor. An impedance compensation resistor is connected in parallel to the attenuation determining resistor, and compensates for a decrease in an impedance due to turn-ON of the first switching element. Further, a second switching element is connected in parallel to the impedance compensation resistor and the first switching element. The second switching element is turned ON according to the control voltage so as to provide the received signal to the low-noise amplifier without attenuation.
    • 公开了一种用于移动台接收机的放大装置。 低噪声放大器将接收到的信号放大到预设电平。 控制器检测对应于从低噪声放大器输出的接收信号的第一帧的信号的电平,并且根据检测到的电平产生控制电压。 衰减确定电阻器确定接收信号的衰减。 第一开关元件与衰减确定电阻器串联连接,并根据控制电压导通,以便衰减通过衰减确定电阻器的接收信号。 阻抗补偿电阻并联连接到衰减确定电阻器,并且补偿由于第一开关元件导通引起的阻抗的降低。 此外,第二开关元件并联连接到阻抗补偿电阻器和第一开关元件。 第二开关元件根据控制电压导通,以将接收的信号提供给低噪声放大器而不衰减。