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Receiver for down-conversion of dual band for digital multimedia broadcasting or digital audio broadcasting

  • US 20050079849A1
  • Filed: 03/04/2004
  • Published: 04/14/2005
  • Est. Priority Date: 10/10/2003
  • Status: Abandoned Application
First Claim
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1. A receiver for down-conversion of a dual band which converts a radio frequency (RF) signal of a first or second band into a desired intermediate frequency (IF) signal, said second band being lower than said first band, said receiver comprising:

  • first amplification means for amplifying said first-band RF signal;

    second amplification means for amplifying said second-band RF signal;

    a first filter connected to output terminals of said first and second amplification means, said first filter removing image frequency components from output signals from said first and second amplification means;

    a voltage controlled oscillator (VCO) for outputting a desired oscillating frequency for the conversion of said first-band RF signal into said IF signal;

    a divider for dividing said desired oscillating frequency in a predetermined ratio to output a frequency for the conversion of said second-band RF signal into said IF signal;

    a mixer connected to output terminals of said first filter, VCO and divider, said mixer mixing said first-band RF signal with an output signal from said VCO or said second-band RF signal with an output signal from said divider to output said IF signal; and

    switching means for, when said first-band RF signal is processed, enabling said first amplification means and transferring the output signal from said VCO directly to said mixer, and, when said second-band RF signal is processed, enabling said second amplification means and transferring the output signal from said VCO to said mixer via said divider.

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