<p>PURPOSE: A multi-mode Doherty power amplifier is provided to obtain high efficiency in various output power levels by adding a new operation mode to implement the high efficiency in a low output power level. CONSTITUTION: One side of a first power terminal (200) is connected to an output terminal of a first input impendence matching unit (100). One side of a firstλ/4 impedance control circuit (400) is connected to an output terminal of a first power terminal. One side of a first impendence matching unit (300) is connected to an output terminal of the firstλ/4 impedance control circuit. One side of a second power terminal (210) is connected to the output terminal of the first impedance matching unit. One side of a first harmonic control unit (700) is connected to an output terminal of the second power terminal. One side of a second impedance matching unit (310) is connected to the output terminal of the first power terminal. [Reference numerals] (AA) 50 Ohm RF input; (BB) 50 Ohm RF output</p>
