Apparatus and method for expanding operation region of power amplifier

A method in an 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,
• wherein the selecting comprises:
• selecting to provide the transmission signal to the first power amplifier when the output power of the transmission signal is greater than the reference power, and
• selecting to provide the transmission signal to the second power amplifier when the output power of the transmission signal is equal to or less than the reference power.

An apparatus for amplifying power, the apparatus comprising:

• an amplitude component determination unit for determining an amplitude component of a transmission signal;
• and
• a power amplify module including a switch, a first power amplifier, and a second power amplifier,
• wherein, when an output power of the transmission signal is greater than a reference power, the switch selects to provide the transmission signal to the first power amplifier so that the first power amplifier amplifies 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 switch selects to provide the transmission signal to the second power amplifier so that the second power amplifier amplifies the power of the transmission signal based on the supply voltage, and
• wherein the power amplify module amplifies power of the transmission signal based on the supply voltage.