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Radio communication apparatus

  • US 6,219,534 B1
  • Filed: 02/09/1999
  • Issued: 04/17/2001
  • Est. Priority Date: 02/09/1998
  • Status: Expired due to Fees
First Claim
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1. A radio communication apparatus, comprising:

  • a first in-phase/quadrature component separating circuit for separating a selecting frequency component included in a signal received by an antenna into an in-phase component signal and a quadrature component signal;

    a first A/D converter for outputting a digital signal obtained through an A/D converter of the in-phase component signal separated by said first in-phase/quadrature component separating circuit;

    a second A/D converter for outputting a digital signal obtained through an A/D conversion of the quadrature component signal separated by said first in-phase/quadrature component separating circuit;

    a detecting circuit for performing a detecting process based on the digital signals outputted from said first and second A/D converters;

    a second in-phase/quadrature component separating circuit for separating the digital signal outputted from said first A/D converter into the in-phase component signal and the quadrature component signal;

    a third in-phase/quadrature component separating circuit for separating the digital signal outputted from said second A/D converter into the in-phase component signal and the quadrature component signal; and

    an interference wave suppression control circuit for controlling at least one of reference voltages of said first and second A/D converters based on each signal separated by said second and third in-phase/quadrature component separating circuits, so that the gain difference of each digital signal outputted from said first and second A/D converters is equal to or less than a prescribed value.

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