학술논문
Design of Broadband Doherty Power Amplifier Based on Single Loop Load Modulation Network
Document Type
Periodical
Source
IEEE Journal on Emerging and Selected Topics in Circuits and Systems IEEE J. Emerg. Sel. Topics Circuits Syst. Emerging and Selected Topics in Circuits and Systems, IEEE Journal on. 14(1):122-132 Mar, 2024
Subject
Language
ISSN
2156-3357
2156-3365
2156-3365
Abstract
This paper proposes a Doherty power amplifier (DPA) architecture with potential for wideband and high efficiency, denoted as single-loop load matching network DPA (SL-LMN). The conventional single combination node network is replaced by an SL-LMN, which adds a new current combination node. This architecture can bring new circuit design freedom, which expands the operating bandwidth of the load modulation network. Using the same prototype topology, the working mechanism of SL-LMN DPA is further illustrated based on three sets of comparative designs. To prove this theory, a broadband asymmetric DPA (ADPA) functioning over 1.9-2.9 GHz is developed and fabricated using two asymmetric GaN transistors. Under continuous wave excitation, the observed data indicates that the drain efficiency of this ADPA is 42.1%-68.9% at saturation and 45.5%-58.5% at 8 dB back-off, respectively. The ADPA has a maximum output power and saturated gain of 44–46 dBm and 6.8-10.9 dB, respectively.