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Apparatus for radio telecommunication system and method of building up output power

  • US 20030224743A1
  • Filed: 02/26/2003
  • Published: 12/04/2003
  • Est. Priority Date: 05/31/2002
  • Status: Active Grant
First Claim
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1. An apparatus for a radio telecommunication system 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 circuit for amplifying 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 amplifier circuit back to said amplitude detection circuit;

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

    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

    precharge means for rapidly raising an output power of said power amplifier circuit from a low power level to a power threshold for building up output power of said power amplifier circuit.

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