High efficiency power amplifier

摘要

A high efficiency power amplifier with a precise duty cycle is provided for use in a driver or pre-power amplifier of a Radio Frequency (RF) system. The high efficiency power amplifier with an inverter configured by one pair of Metal Oxide Semiconductor (MOS) transistors (M11,M12) includes a feedback path (R1) for 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 (M11,M12) configuring the inverter. The high efficiency power amplifier can be used for a high efficiency driver to automatically correct duty cycle distortion. When the high efficiency power amplifier is placed in a front stage of various RF power amplifiers, it can be used for a pre-amplifier capable of increasing the efficiency of the RF power amplifier.