학술논문
Optimization Design of Broadband Doherty PA Using Fragment-Type Matching Network Based on Dual-State Impedance Objective Function
Document Type
Periodical
Source
IEEE Transactions on Circuits and Systems II: Express Briefs IEEE Trans. Circuits Syst. II Circuits and Systems II: Express Briefs, IEEE Transactions on. 71(4):1809-1813 Apr, 2024
Subject
Language
ISSN
1549-7747
1558-3791
1558-3791
Abstract
In this brief, an optimization design of broadband Doherty power amplifier (DPA) is presented for the extension of bandwidth. A dual-state impedance objective function is utilized in the optimization of the carrier and peaking output matching networks (OMNs) to satisfy the load impedance constraints at back-off output power and saturation, respectively. Unlike conventional method, a novel impedance constraint strategy is proposed by employing an impedance constraint circle in Smith chart, which can more fully utilize the impedance region obtained from load-pull simulations. Moreover, to increase design flexibility, a fragment-type matching circuit is employed in the OMN optimization design together with the dual-state impedance objective function. Experimental results demonstrate a 1.2 to 2.6 GHz (74% fractional bandwidth) broadband DPA with a drain efficiency of 49.7%–53.5% measured at 6 dB back-off and a saturated output power of higher than 43 dBm.