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Semiconductor integrated circuit for communication, radio-communications apparatus, and transmission starting method

  • US 7,230,997 B2
  • Filed: 02/26/2003
  • Issued: 06/12/2007
  • Est. Priority Date: 05/31/2002
  • Status: Expired due to Fees
First Claim
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1. A semiconductor integrated circuit for communication comprising:

  • a modulation circuit for performing phase modulation and amplitude modulation;

    a phase detection circuit for detecting a phase component of a signal modulated by said modulation circuit;

    an amplitude detection circuit for detecting an amplitude component of the signal modulated by said modulation circuit;

    a power amplifier for amplifying the power of a transmission signal and outputting the amplified transmission signal;

    a feedback path for feeding a signal corresponding to an output level of said power amplification circuit back to said amplitude detection circuit;

    a variable gain amplification circuit provided on a forward path between said amplitude detection circuit and said power amplification circuit for generating a control voltage for an amplitude control;

    a loop filter for setting a frequency bandwidth of an amplitude control loop, said amplitude control loop including said feedback path and said forward path; and

    a sequence control circuit for sequentially generating control signals and supplying the generated control signals to associated circuits for operating said circuits in a predetermined order based on a command supplied thereto.

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