Loading [MathJax]/extensions/TeX/ieee_stixext.js
Design of Wideband Doherty Power Amplifier Using Inverse Continuous Class-F Mode | IEEE Journals & Magazine | IEEE Xplore

Design of Wideband Doherty Power Amplifier Using Inverse Continuous Class-F Mode


Abstract:

This brief presents the theory and design method of a wideband Doherty power amplifier (DPA) using inverse continuous class-F mode (ICFM). It is illustrated that continuo...Show More

Abstract:

This brief presents the theory and design method of a wideband Doherty power amplifier (DPA) using inverse continuous class-F mode (ICFM). It is illustrated that continuous class-F−1 mode impedance condition can be achieved for Doherty operation using a simple load modulation network (LMN). The required LMN parameters and corresponding load modulation process are analyzed and calculated in theory. The post-matching architecture is then employed to realize the proposed ICFM-DPA with equivalent transmission line (TL) based LMN, which absorbs the parasitic and package parameters of the active devices. To validate the proposed ICFM-DPA architecture and design method, a physical DPA prototype using commercial gallium nitride (GaN) transistors is then designed and implemented with wider than 44% fractional bandwidth. The fabricated ICFM-DPA achieves saturated output power of 42.6–43.3 dBm with peak efficiency of 66.0%–74.6% throughout the target bandwidth. At 6 dB output power back-off (OBO), 57.0%–61.5% back-of efficiency is obtained by the implemented ICFM-DPA with power gain of 13.5–16 dB.
Published in: IEEE Transactions on Circuits and Systems II: Express Briefs ( Volume: 71, Issue: 9, September 2024)
Page(s): 4176 - 4180
Date of Publication: 21 March 2024

ISSN Information:

Funding Agency:


I. Introduction

During the past decade, the continuous-mode (CM) technique has been one of the most popular research topics for power amplifier (PA) designs, meeting the development requirements from broadband wireless communication systems. Several different continuous modes have been proposed to extend the PA design space, such as continuous class-B/J and class-F/F−1 [1], [2], [3], which makes it much easier to realize broadband PAs while maintaining high efficiency performance at the same time. As such an effective technique for bandwidth extension, the CM technique was then quickly introduced into more practical PA architectures used in wireless communication systems.

References

References is not available for this document.