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    • 9. 发明专利
    • Intermodulation disturbance detecting circuit
    • 互连干扰检测电路
    • JP2009111849A
    • 2009-05-21
    • JP2007283608
    • 2007-10-31
    • Nsc Co LtdNsc株式会社
    • ISHIGURO KAZUHISA
    • H04B1/26H03G3/20H04B1/10
    • H04B1/1018
    • PROBLEM TO BE SOLVED: To enable easily detecting an intermodulation disturbance irrespective of a level of a received signals or a desirable wave included therein.
      SOLUTION: An intermodulation disturbance detecting circuit includes: a frequency converting circuit 21 for inputting a broadband IF signal which includes a disturbing wave and carrying out a frequency conversion with an oscillating signal having a frequency of a desirable wave, and outputting a signal including a sum frequency component of a frequency component of a disturbing wave which is included in the IF signal and a frequency component of a desirable wave of the oscillating signal and a difference frequency component therebetween; and a low-pass filter 22 for attenuating the sum frequency component to output a signal of the difference frequency component, wherein the presence or absence of an intermodulation disturbance is detected based on a frequency relationship between two difference frequency components outputted from the low-pass filter 22. With this configuration, it is possible to easily detect the intermodulation disturbance irrespective of the level of a received signal or a desirable wave included therein without carrying out a processing for amplitude modulating the received signal.
      COPYRIGHT: (C)2009,JPO&INPIT
    • 要解决的问题:无论接收信号的电平或其中包含的期望波的电平如何,都能够容易地检测互调干扰。 互调扰动检测电路包括:频率转换电路21,用于输入包括干扰波的宽带IF信号,并用具有期望波频率的振荡信号进行频率转换,并输出信号 包括包含在IF信号中的干扰波的频率分量的和频分量和振荡信号的期望波的频率分量和它们之间的差频分量; 以及低通滤波器22,用于衰减和频分量以输出差频分量的信号,其中基于从低通输出的两个差频分量之间的频率关系来检测是否存在互调干扰 通过这种配置,无需对接收到的信号的电平或包含在其中的期望波的电平进行调制,就可以容易地检测互调干扰,而不进行用于幅度调制的接收信号的处理。 版权所有(C)2009,JPO&INPIT