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Modulation circuit device, modulation method and radio communication device

  • US 20050008093A1
  • Filed: 07/07/2004
  • Published: 01/13/2005
  • Est. Priority Date: 07/08/2003
  • Status: Active Grant
First Claim
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1. A modulation circuit device, comprising:

  • an angle modulator of angle-modulating a phase signal to be inputted;

    waveform shaping means in which, (1) when the magnitude of an amplitude signal to be inputted becomes smaller than a first prescribed value, a waveform of said amplitude signal is shaped so that the magnitude of said amplitude signal of the portion which becomes small becomes said first prescribed value, and/or (2) when the magnitude of said amplitude signal to be inputted becomes larger than said second prescribed value which is larger than said first prescribed value, the waveform of said amplitude signal is shaped so that the magnitude of said amplitude signal of the portion which becomes large becomes said second prescribed value; and

    an amplitude modulator of amplitude-modulating the signal from the output of said angle modulator by the signal of the output of said waveform shaping means.

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