| 摘要 |
PURPOSE:To suppress sufficiently excess heat by detecting a difference between a reference voltage and an AGC voltage obtained from an output power detecting of a power amplifier to increase a transmitted output power mounted to a portable radio communication equipment under the unified control so as to control a transmission output power of the portable radio communication equipment. CONSTITUTION:The portable radio communication equipment 1 consists of a power amplifier circuit 3, the output power detecting circuit 5, a differential amplifier circuit 7 and a switch 11, and the differential amplifier circuit 7 gives a voltage proportional to the difference between an AGC voltage and the reference voltage 9 to an AGC terminal of the power amplifier circuit 3. The power amplifier device 2 consists a power amplifier circuit 4 and an output power detection circuit 6. In connecting the portable radio communication equipment 1 and the power amplifier device 2, the AGC voltage obtained by the power detecting circuit 6 is inputted to the differential amplifier circuit 7 by switching the switch 11 so as to form an automatic control loop bridged over between the portable radio communication equipment 1 and the power amplifier device 2, and the automatic control loop is operated so as to decrease the gain of the power amplifier circuit 3. Thus, the power consumption of the power amplifier circuit 3 becomes a required minimum value. |
