2015/11/19 by Jingzhou Pang, Songbai He, Chaoyi Huang +3 · 174 citations
Engineering · #Advanced Power Amplifier Design #Amplifier #Bandwidth (computing) #Broadband #Computer science #Doherty amplifier #Electrical engineering #Electrical impedance #Electronic engineering #Engineering #Impedance matching #Microwave Engineering and Waveguides #RF power amplifier #Radio Frequency Integrated Circuit Design #Telecommunications
paper · doi:10.1109/tmtt.2015.2495201
published in IEEE Transactions on Microwave Theory and Techniques 63(12), 4061-4071 (IEEE Microwave Theory and Techniques Society)
openalex publication_date 2015/11/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
This paper presents a modified Doherty configuration with extended bandwidth. The narrow band feature of the conventional Doherty amplifier is discussed in the view of the broadband matching. To extend the bandwidth, the post-matching architecture is employed in the proposed design. Meanwhile, broadband low-order impedance inverters are adopted to replace the quarter-wavelength transmission lines. Low-pass filter topologies are used to realize both the post matching network and the impedance inverters. A modified Doherty Power amplifier was designed and fabricated based on commercial GaN HEMT devices to validate the broadband characteristics of this configuration. The 6-dB backoff efficiencies of 47%-57% are obtained from 1.7 to 2.6 GHz (41.9% fractional bandwidth) and the measured maximum output power ranges from 44.9 to 46.3 dBm in the designed band. In particular, more than 40% efficiencies are measured at 10-dB backoff throughout the operation band.