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    • 5. 发明申请
    • FM-AM DEMODULATOR AND CONTROL METHOD THEREFOR
    • FM-AM解调器及其控制方法
    • US20100197252A1
    • 2010-08-05
    • US12685960
    • 2010-01-12
    • Nobunari TSUKAMOTO
    • Nobunari TSUKAMOTO
    • H04B1/06H03D99/00
    • H04B1/30H03D1/00H03D3/009
    • A FM-AM demodulator includes a FM signal amplifier, a local oscillator, an image oscillator, a first selector, a first orthogonal mixer, an AM signal amplifier, a first frequency divider, a second frequency divider, a second selector, a second orthogonal mixer, a third selector, a first filter, a first amplifier, a fourth selector, a second filter, a second amplifier, a first gain controller, an I/Q compensation unit, an IF oscillator, a third orthogonal mixer, an adder, a channel filter configured to extract a signal with a predetermined frequency band output from the adder, a third amplifier, a second gain controller, a demodulator, and an I/Q compensation controller configured to generate an I/Q compensation signal to use for adjusting phase and gain of the I signal used in an I/Q compensation unit by detecting amplitude of the output signal from the demodulator, and output the generated signal to the I/Q compensation unit.
    • FM-AM解调器包括FM信号放大器,本地振荡器,图像振荡器,第一选择器,第一正交混频器,AM信号放大器,第一分频器,第二分频器,第二选择器,第二正交 混频器,第三选择器,第一滤波器,第一放大器,第四选择器,第二滤波器,第二放大器,第一增益控制器,I / Q补偿单元,IF振荡器,第三正交混频器, 信道滤波器,被配置为从加法器输出的预定频带提取信号;第三放大器,第二增益控制器,解调器和I / Q补偿控制器,被配置为产生用于调整的I / Q补偿信号 通过检测来自解调器的输出信号的振幅,在I / Q补偿单元中使用的I信号的相位和增益,并将产生的信号输出到I / Q补偿单元。