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Semiconductor integrated circuit for communication and portable communication terminal

  • US 20060234661A1
  • Filed: 04/17/2006
  • Published: 10/19/2006
  • Est. Priority Date: 04/18/2005
  • Status: Abandoned Application
First Claim
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1. A semiconductor integrated circuit for communication, including a transmission circuit having a phase control loop for controlling phase of a carrier wave and an amplitude control loop for controlling amplitude of a transmission output signal, comprising a calibration circuit which compares a feedback signal with an output signal of a modulation circuit while changing electric parameters of any of circuits on the amplitude control loop step by step, detects variations in a loop gain, and corrects a loop band by changing the characteristics of any of the circuits on the amplification control loop in accordance with the detected variations.

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