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Composition purpose signal generating apparatus, IC chip, GPS receiver, and cellular phone

  • US 20060293010A1
  • Filed: 05/22/2006
  • Published: 12/28/2006
  • Est. Priority Date: 06/28/2005
  • Status: Abandoned Application
First Claim
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1. A composition purpose signal generating apparatus, which comprises an oscillator for outputting a composition purpose signal to a frequency changing apparatus which outputs a composite wave consisting of a receiving signal and the composition purpose signal as an intermediate frequency signal, a frequency divider for dividing the frequency of the composition purpose signal output from the oscillator, a reference oscillator for outputting a reference signal, a phase comparator for outputting phase difference data which indicates a phase difference between the composition purpose signal which is frequency divided by the frequency divider and the reference signal, and a filter for outputting the phase difference data output from the phase comparator as a control voltage of the oscillator, comprising composition purpose signal frequency changing means for changing the frequency of the composition purpose signal when the frequency of a composite wave consisting of a basic wave or harmonic constituting a communication signal, which is an interference wave to the receiving signal, and a basic wave or harmonic constituting the composition purpose signal is almost equal to the frequency of the intermediate frequency signal.

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