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Transmission output circuit and mobile communication terminal

  • US 7,139,537 B2
  • Filed: 02/20/2003
  • Issued: 11/21/2006
  • Est. Priority Date: 02/21/2002
  • Status: Expired due to Term
First Claim
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1. A transmission output circuit comprising:

  • gain control amplification means for varying gain of an input signal in accordance with a gain control signal;

    power amplification means for amplifying power of an output signal from said gain control amplification means;

    transmission power output level instruction means for specifying a target transmission power output level;

    transmission power control data generation means for generating the gain control signal for performing a feed forward control of said gain control amplification means in order that an output signal level of said power amplification means becomes said target transmission power output level;

    detection means for obtaining detected signal data by detecting the output signal of said power amplification means; and

    judgment means for judging existence of occurrence of trouble in a transmission output system by determining whether said detected signal data from said detection means or said gain control signal are within a determined range,wherein said feed forward control is a closed loop control based on a transmission power control data form a transmission side; and

    wherein said judgment means judges the existence of occurrence of trouble by determining whether present gain control signal is within a data range assumed relative to said present detecting signal data obtained from said detection means.

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