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    • 5. 发明授权
    • Frequency converter and radio receiver using same
    • 变频器和无线电接收机使用相同
    • US5995819A
    • 1999-11-30
    • US755468
    • 1996-11-22
    • Takafumi YamajiOsamu WatanabeHiroshi TanimotoTetsuro ItakuraShoji OtakaRyuichi Fujimoto
    • Takafumi YamajiOsamu WatanabeHiroshi TanimotoTetsuro ItakuraShoji OtakaRyuichi Fujimoto
    • H03D7/00H03D7/14H04B1/00
    • H03F3/45085H03D7/00H03D7/1408H03D7/1433H03D7/1441H03D7/1458H03D7/1475H03D2200/0007H03D2200/0025H03D2200/0047H03D2200/009
    • A frequency converter includes: a signal synthesizer element for inputting first and second input signals to synthesize these signals and for outputting a synthesized signal, from which noises even times as large as the frequency of the second input signal are removed; an amplitude limitation amplifier element, composed of a differential amplifier circuit, for amplifying the synthesized signal outputted from the signal synthesizer element to output an amplified signal having a constant amplitude; and a filter for inputting the amplified signal outputted from the amplitude limitation amplifier element, to remove an unnecessary signal component to produce an output a baseband signal including only a desired signal component. In addition, a radio receiver using the frequency converter of such a construction is designed to input the output of a local oscillator to a variable attenuator or a variable gain amplifier, to input the output of the variable attenuator or the variable gain amplifier as the first input signal to the frequency converter so as to perform the gain control. Thus, not only is self-mixing, a common problem in direct conversion receivers, prevented, but also, because a smaller local oscillation driving signal is required, power consumption is significantly reduced.
    • 一种频率转换器,包括:信号合成器元件,用于输入第一和第二输入信号以合成这些信号并输出​​合成信号,从该信号合成信号除去除了第二输入信号的频率以上的噪声; 幅度限制放大器元件,由差分放大电路组成,用于放大从信号合成器元件输出的合成信号,以输出具有恒定幅度的放大信号; 以及滤波器,用于输入从幅度限制放大器元件输出的放大信号,以去除不必要的信号分量以产生仅包括所需信号分量的基带信号。 此外,使用这种结构的变频器的无线电接收机被设计成将本地振荡器的输出输入到可变衰减器或可变增益放大器,以将可变衰减器或可变增益放大器的输出作为第一 输入到变频器的信号,以进行增益控制。 因此,不仅自发混合,直接转换接收器中的常见问题被阻止,而且由于需要较小的本地振荡驱动信号,所以功耗显着降低。