APPARATUS AND METHOD FOR CONTROLLING TRANSMISSION POWER OF MOBILE COMMUNICATION TERMINAL

摘要

PURPOSE: An apparatus and method for controlling a transmission power of a mobile communication terminal is provided to remove phenomenon in which the transmission power is instantaneously increased or decreased according to a switching of a power amplifier. CONSTITUTION: The first power amplifier(330) outputs an RF(Radio Frequency) signal which is more a predetermined power level. The second power amplifier(380) is connected to the first power amplifier(330) in parallel, and outputs an RF signal which is less than the power level. A variable attenuator(320) is located at a front terminal of the first power amplifier(330). An RSSI(Received Signal Strength Indicator) detecting unit(360) detects the strength of a received signal. A control unit(370) determines an output power level according to the detected strength of the received signal, controls the variable attenuator(320) for adjusting a difference of power gains of two power amplifiers(330,380) as a value within a predetermined range, and selects one between the first and second amplifiers(330,380). A power supply unit(350) supplies an operation power suitable for the selected power amplifier so that the input RF signal is amplified by the selected power amplifier and the amplified RF signal is transmitted.