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    • 14. 发明授权
    • Direct conversion receiver
    • 直接转换接收机
    • US06360087B1
    • 2002-03-19
    • US09260919
    • 1999-03-02
    • Dmitriy RozenblitWilliam J. DominoMorten DamgaardMark Oskowsky
    • Dmitriy RozenblitWilliam J. DominoMorten DamgaardMark Oskowsky
    • H04B106
    • H04B1/406H03D3/006H03D7/1408H03D7/1433H03D7/1458H03D7/1491H03D2200/0047H03D2200/009H04B1/30
    • A direct conversion receiver system is provided in which a first input signal at a first frequency is applied to a first input port of a multiplier, a second input signal at a second frequency equal to about {fraction (1/n)} times the first frequency, wherein n is an integer, is applied to a second input port of the multiplier. A first filter coupled to the first input port is configured to substantially filter out any leakage at the second frequency which may be present. A second filter coupled to the second input port is configured to substantially filter out any leakage at the first frequency which may be present. The multiplier is configured to produce a signal at an output port thereof which is derived from the product of the first and second signals. In one embodiment, the output is representative of the product of the filtered first signal and a multiplication factor which switches at n times the second frequency. The output of the multiplier is coupled to a third filter. The output signal has a baseband component and another component. The third filter is configured to substantially filter out the other component and substantially maintain the baseband component in the output signal. In one implementation example, the multiplier is a mixer initializing half-frequency injection, such that the LO frequency is about ½ the RF frequency.
    • 提供一种直接转换接收机系统,其中以第一频率的第一输入信号被施加到乘法器的第一输入端口,第二频率的第二输入信号等于第一频率的大约{分数(1 / n)}倍) 频率,其中n是整数,被施加到乘法器的第二输入端口。 耦合到第一输入端口的第一滤波器被配置为基本上滤除可能存在的第二频率处的任何泄漏。 耦合到第二输入端口的第二滤波器被配置为基本上滤除可能存在的第一频率处的任何泄漏。 乘法器被配置为在其输出端口处产生从第一和第二信号的乘积导出的信号。 在一个实施例中,输出代表滤波后的第一信号和在第二频率n倍切换的乘法因子的乘积。 乘法器的输出耦合到第三个滤波器。 输出信号具有基带分量和另一分量。 第三滤波器被配置为基本上滤除另一分量并且基本上保持输出信号中的基带分量。 在一个实施例中,乘法器是混频器初始化半频率注入,使得LO频率约为RF频率的1/2。