Patent ID: 7574182

Claim:
A mobile communication terminal comprising: a power amplifier configured to amplify a power of a received signal and wirelessly transmit the amplified signal through an antenna; a power detector configured to determine whether the amplified power of the signal exceeds a particular critical range; a detected voltage level converter configured to convert a voltage corresponding to the output power exceeding the critical range into a voltage having a particular voltage level; and a varied driving voltage output unit configured to vary the converted voltage and apply the varied voltage to the power amplifier, wherein the varied driving voltage output unit varies a voltage to the power amplifier that is a predetermined number of times greater than the voltage input from the detected voltage level converter, wherein the varied driving voltage output unit includes a comparing module configured to compare the varied voltage that is the predetermined number of times greater than the voltage input from the detected voltage level converter with a voltage applied from a battery, and wherein if the voltage that is the predetermined number of times greater than the voltage input from the detected voltage level converter is smaller than the voltage applied form the battery, the comparing module applies the voltage from the battery to the power amplifier.