Apparatus and method for expanding operation region of power amplifier

A method in a electronic device, the method comprising:

• selecting one of a first power amplifier and a second power amplifier based on an output power of a transmission signal;
• generating a supply voltage of the selected power amplifier based on an amplitude component of the transmission signal;
• and
• amplifying power of the transmission signal based on the supply voltage using the selected power amplifier.

An apparatus for amplifying power, the apparatus comprising:

• an amplitude component determination unit for determining an amplitude component of a transmission signal;
• and
• when an output power of the transmission signal is greater than a reference power, a power amplify module controls a first power amplifier to amplify the power of the transmission signal based on the supply voltage, and when the output power of the transmission signal is equal to or less than the reference power, the power amplify module controls a second power amplifier to amplify the power of the transmission signal based on the supply voltage,
• wherein the power amplify module amplifies power of the transmission signal based on the supply voltage.