High efficiency power amplifier with accurate duty cycle

A high-efficiency power amplifier with a precise duty cycle is provided to maintain a high duty cycle at high efficiency while actively coping with various environmental variations including a mismatch, process variation, and temperature variation. A high-efficiency power amplifier includes an inverter configured of a pair of MOS(Metal Oxide Semiconductor) transistors(M1,M2), and a feedback path adjusting an input voltage in response to an output voltage between input and output terminals of the inverter and correcting an operation time point of the MOS transistors configuring the inverter. The feedback path is a resistor connected between the input and output terminals of the inverter.