TY - GEN
T1 - Asymmetrical Continuous Mode Doherty Power Amplifier Using Complex Combining Load Impedance
AU - Roychowdhury, Debatrayee
AU - Kitchen, Jennifer
N1 - Funding Information:
ACKNOWLEDGMENT This work was funded under NSF Award #1910380. The authors would like to thank Maruf Ahmed at NXP Semiconductors for his valuable guidance.
Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - This work presents a broadband asymmetrical continuous-mode class J Doherty power amplifier (PA) using complex combining load. The DPA functions as a class J PA when operating in the low power region. The proposed Doherty PA (DPA) achieves continuous mode class J characteristics by varying the reactive part of the complex load. This variable complex combing load has been realized by a novel post-matching network (PMN). A detailed theoretical analysis is presented that shows the impedance transformation procedure from the asymmetrical DPA impedance trajectory to a class J. To validate the proposed technique, a prototype PA has been designed with Cree GaN devices for 9 dB output power back-off (OBO) operating from 1.8 GHz to 2.6 GHz. In the aforementioned frequency band, the PA achieves 61%-76% efficiency at saturation and 43%-60% efficiency at OBO. The PA maintains 10 dB gain and an average of 43 dBm power over the entire frequency range.
AB - This work presents a broadband asymmetrical continuous-mode class J Doherty power amplifier (PA) using complex combining load. The DPA functions as a class J PA when operating in the low power region. The proposed Doherty PA (DPA) achieves continuous mode class J characteristics by varying the reactive part of the complex load. This variable complex combing load has been realized by a novel post-matching network (PMN). A detailed theoretical analysis is presented that shows the impedance transformation procedure from the asymmetrical DPA impedance trajectory to a class J. To validate the proposed technique, a prototype PA has been designed with Cree GaN devices for 9 dB output power back-off (OBO) operating from 1.8 GHz to 2.6 GHz. In the aforementioned frequency band, the PA achieves 61%-76% efficiency at saturation and 43%-60% efficiency at OBO. The PA maintains 10 dB gain and an average of 43 dBm power over the entire frequency range.
KW - asymmetrical DPA
KW - class J
KW - complex combining load (CCL)
KW - continuous mode
KW - Doherty power amplifier (DPA)
KW - gallium nitride (GaN)
KW - power amplifiers
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U2 - 10.1109/WMCS55582.2022.9866245
DO - 10.1109/WMCS55582.2022.9866245
M3 - Conference contribution
AN - SCOPUS:85138468769
T3 - Proceedings of the 2022 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems, WMCS 2022
BT - Proceedings of the 2022 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems, WMCS 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems, WMCS 2022
Y2 - 19 April 2022 through 20 April 2022
ER -