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    • 2. 发明申请
    • Radio reception device for receiving both terrestrial and satellite digital broadcasting
    • 用于接收地面和卫星数字广播的无线电接收装置
    • US20070105513A1
    • 2007-05-10
    • US11586570
    • 2006-10-26
    • Ju-ho SonJae-young Ryu
    • Ju-ho SonJae-young Ryu
    • H04B1/40H04B7/08H04B7/00
    • H04B1/0064
    • A radio reception device for receiving both terrestrial and satellite digital broadcasting. The device includes a reception device for a first radio communication method and a reception device for a second radio communication method. The reception device for a first radio communication method includes a first reception unit which receives and amplifies a first input frequency signal, a Local Oscillation (LO) signal generation unit which generates an LO frequency signal, a first mixing unit which outputs a frequency down-converted signal, and a signal processing unit which receives the signal output from the first mixing unit and performing signal processing. The reception device for a second radio communication method includes a second reception unit which receives and amplifies a second input frequency signal, a frequency divider, and a second mixing unit which outputs a frequency down-converted signal to the signal processing unit.
    • 一种用于接收地面和卫星数字广播的无线电接收装置。 该装置包括用于第一无线电通信方法的接收装置和用于第二无线电通信方法的接收装置。 用于第一无线电通信方法的接收装置包括:接收和放大第一输入频率信号的第一接收单元,产生LO频率信号的本地振荡(LO)信号产生单元;第一混合单元, 以及信号处理单元,其接收从第一混合单元输出的信号并执行信号处理。 用于第二无线电通信方法的接收装置包括:第二接收单元,其接收并放大第二输入频率信号;分频器;以及第二混合单元,其向信号处理单元输出降频变换信号。
    • 9. 发明申请
    • Variable gain amplifier
    • 可变增益放大器
    • US20060097792A1
    • 2006-05-11
    • US11172883
    • 2005-07-05
    • Jae-young RyuHyun-koo KangDae-yeon KimJeong-ho Lee
    • Jae-young RyuHyun-koo KangDae-yeon KimJeong-ho Lee
    • H03F1/22
    • H03G1/0088H03F3/45188H03G1/0029H03G3/001
    • A variable gain amplifier (VGA) having stable input impedance matching and a stable noise figure in spite of a variation of an amplification gain is provided. In an embodiment of the VGA, a first stage of a cascode amplification unit has a fixed impedance regardless of a change of an amplification gain, and a variable gain determination unit comprised of a plurality of transistors is formed at an upper stage in the cascode amplification unit. Accordingly, a change of an input impedance of the cascode amplification unit due to the change of the amplification gain is minimized. In another embodiment of the VGA, an amplification gain of an amplification unit is controlled by adjusting a voltage applied to the amplification unit by controlling a current to be output by a current supply source, and stable input impedance matching and a stable noise figure are obtained.
    • 提供了具有稳定的输入阻抗匹配的可变增益放大器(VGA)和尽管放大增益的变化的稳定的噪声系数。 在VGA的一个实施例中,级联放大单元的第一级具有固定的阻抗,而与放大增益的变化无关,并且在共源共栅放大中的上级形成由多个晶体管组成的可变增益确定单元 单元。 因此,由于放大增益的变化引起的共源共栅放大单元的输入阻抗的变化被最小化。 在VGA的另一实施例中,通过控制由电流源输出的电流来调节施加到放大单元的电压来控制放大单元的放大增益,并获得稳定的输入阻抗匹配和稳定的噪声系数 。