TY - GEN
T1 - Extend High Efficiency Range of Doherty Power Amplifier by Modifying Characteristic Impedance of Transmission Lines in Load Modulation Network
AU - Pang, Jingzhou
AU - Li, Yue
AU - Chu, Chenhao
AU - Peng, Jun
AU - Zhou, Xin Yu
AU - Zhu, Anding
PY - 2020/8
Y1 - 2020/8
N2 - A load modulation network with characteristic impedance-modified transmission lines (TLs) is presented in this paper to extend the efficiency range and bandwidth of the Doherty power amplifier (DPA). Characteristic impedance values for designing the proposed DPA with different high efficiency ranges are given and wideband performance can also be achieved. A DPA with 2.55-3.35 GHz bandwidth using commercial GaN transistors is designed and implemented to validate the proposed architecture. The fabricated DPA achieves a measured 9.2-10.4 dB gain and 44.3-45.4 dBm saturated power. 57.9-75.6% and 47.6-58.8 % drain efficiency is achieved at saturation and 8 dB output power back-off (OBO) within the designed bandwidth, respectively. When driven by a 5-carrier 100 MHz OFDM signal with 8 dB peak to average power ratio (PAPR), the proposed DPA achieves adjacent channel leakage ratio (ACLR) of better than -50 dBc after digital pre-distortion with average efficiency of 53.4%, 55.3% and 56.6% at 2.75, 2.95 and 3.15 GHz centre frequencies.
AB - A load modulation network with characteristic impedance-modified transmission lines (TLs) is presented in this paper to extend the efficiency range and bandwidth of the Doherty power amplifier (DPA). Characteristic impedance values for designing the proposed DPA with different high efficiency ranges are given and wideband performance can also be achieved. A DPA with 2.55-3.35 GHz bandwidth using commercial GaN transistors is designed and implemented to validate the proposed architecture. The fabricated DPA achieves a measured 9.2-10.4 dB gain and 44.3-45.4 dBm saturated power. 57.9-75.6% and 47.6-58.8 % drain efficiency is achieved at saturation and 8 dB output power back-off (OBO) within the designed bandwidth, respectively. When driven by a 5-carrier 100 MHz OFDM signal with 8 dB peak to average power ratio (PAPR), the proposed DPA achieves adjacent channel leakage ratio (ACLR) of better than -50 dBc after digital pre-distortion with average efficiency of 53.4%, 55.3% and 56.6% at 2.75, 2.95 and 3.15 GHz centre frequencies.
KW - Broadband
KW - Doherty power amplifiers
KW - Extended high efficiency range
KW - Load modulation network
KW - Broadband
KW - Doherty power amplifiers
KW - Extended high efficiency range
KW - Load modulation network
KW - Broadband
KW - Doherty power amplifiers
KW - Extended high efficiency range
KW - Load modulation network
UR - http://www.scopus.com/inward/record.url?scp=85094200872&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85094200872&origin=recordpage
U2 - 10.1109/IMS30576.2020.9224070
DO - 10.1109/IMS30576.2020.9224070
M3 - RGC 32 - Refereed conference paper (with host publication)
SN - 9781728168166
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 707
EP - 710
BT - Proceedings of the 2020 IEEE/MTT-S International Microwave Symposium (IMS)
PB - IEEE
T2 - 2020 IEEE/MTT-S International Microwave Symposium (IMS 2020)
Y2 - 4 August 2020 through 6 August 2020
ER -