An asymmetric Doherty architecture based on three identical transistors is proposed in this paper. This proposed three.way topology reduces the difficulty in designing matching networks brought by the low optimal impe...An asymmetric Doherty architecture based on three identical transistors is proposed in this paper. This proposed three.way topology reduces the difficulty in designing matching networks brought by the low optimal impedance of high power transistors. And the inverted Doherty topology as well as carefully chosen value of load impedance makes it possible to extend the bandwidth of high power amplifiers. Besides, bias networks of this proposed three.way architecture are also carefully considered to improve the linearity. The proposed high power three.way Doherty power amplifier(3W.DPA) is designed and fabricated based on theoretic analysis. Its maximum output power is about 600 Watts and the drain efficiency is above 35.5% at 9d B back off output power level from 1.9GHz to 2.2 GHz and the saturated drain efficiency is above 47% across the whole frequency band. The measured concurrent two.tone results suggest that the linearity of DPA is improved by at least 5d B.展开更多
基金supported in part by the National Basic Research Program of China (Grant No. 2014CB339900)the National Science and Technology Major Project of the Ministry of Science and Technology of China (Grant No. Grant 2015ZX03002002 and Grant 2016ZX03002009, and Grant 2016ZX03001005)+2 种基金the 863 program (Grant No. 2015AA010802)the National Natural Science Foundation of China (Grant No. 61522112, 61331003)the New Century Excellent Talents in University (NCET)
文摘An asymmetric Doherty architecture based on three identical transistors is proposed in this paper. This proposed three.way topology reduces the difficulty in designing matching networks brought by the low optimal impedance of high power transistors. And the inverted Doherty topology as well as carefully chosen value of load impedance makes it possible to extend the bandwidth of high power amplifiers. Besides, bias networks of this proposed three.way architecture are also carefully considered to improve the linearity. The proposed high power three.way Doherty power amplifier(3W.DPA) is designed and fabricated based on theoretic analysis. Its maximum output power is about 600 Watts and the drain efficiency is above 35.5% at 9d B back off output power level from 1.9GHz to 2.2 GHz and the saturated drain efficiency is above 47% across the whole frequency band. The measured concurrent two.tone results suggest that the linearity of DPA is improved by at least 5d B.
