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Radio receiver and radio receiving method

  • US 7,272,371 B2
  • Filed: 12/24/2002
  • Issued: 09/18/2007
  • Est. Priority Date: 12/25/2001
  • Status: Expired due to Fees
First Claim
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1. A radio receiver, comprising:

  • a low noise amplifier which amplifies a radio signal;

    a quadrature demodulator which demodulates the amplified radio signal into a baseband signal;

    a variable gain amplifier which amplifies the baseband signal;

    an offset canceller configured to cancel an offset of the baseband signal according to the amplified baseband signal; and

    a signal intensity detector which detects an intensity of the amplified baseband signal;

    a gain selector which selects a preset gain from a plurality of preset gains which are set for the low noise amplifier, based on the detected intensity;

    a monitoring unit configured to monitor the selection of the gain selector in order to obtain a time interval between switching of a gain of the low noise amplifier;

    a comparator which compares a preset time-interval with the time interval; and

    a gain controller configured to change a gain of the variable gain amplifier when the time interval is longer than the preset time-interval.

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