Filtering Doherty power amplifier

• Published in: IET microwaves, antennas & propagation Vol. 14; no. 10; pp. 1074 - 1078
• Main Authors: Qi, Xiaobo, Xiao, Fei
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 12.08.2020
• Subjects: bandpass power divider; band‐pass filters; Doherty power amplifier topology; filtering Doherty power amplifier; frequency 2.0 GHz; microwave power amplifiers; out‐of‐band suppression; power dividers; power division; Research Article; third‐order bandpass response; wireless communication; Doherty power amplifier topology; band-pass filters; filtering Doherty power amplifier; third-order bandpass response; bandpass power divider; power dividers; microwave power amplifiers; out-of-band suppression; power division; wireless communication; frequency 2.0 GHz
• ISSN: 1751-8725; 1751-8733; 1751-8733
• DOI: 10.1049/iet-map.2019.0835

At present, it is a trend in wireless communication to integrate conventional separate components into a single one for further miniaturisation and whole performance optimisation. In this study, a novel filtering Doherty power amplifier topology is proposed, which incorporates a bandpass power divider for power division. The power divider is characterised by third-order bandpass response and good out-of-band performance, and then it can purify the input spectrum for the whole amplifier. For demonstration, an example of this filtering Doherty power amplifier at 2.0 GHz was designed, fabricated and measured. The measured results show that at least 21 dB of the out-of-band suppression is obtained up to fourth harmonic for purifying the input spectrum. Meanwhile, high back-off efficiency is still retained for this filtering Doherty power amplifier.