Current wireless communication systems require highly efficient and linear power amplifiers. However, there is a trade-off relationship between the efficiency and the linearity. To enhance the performance over the barrier limited by the trade-off, digital control and digital error correction for linearity of a power amplifier become hot research items. We will introduce the digital techniques to enhance performances. It includes the RF transmitter architecture controlled by digital circuit such as a delta-sigma modulator, and the digital feedback pre-distortion technique, which linearizes the highly efficient saturated power amplifiers.
['Bumman Kim', 'Jangheon Kim', 'Jinsung Choi', 'Ildu Kim']
Performance enhancement of linear power amplifier employing digital technique