Bandwidth Enhancement of Frequency Dispersive Doherty Power Amplifier
Publication in refereed journal

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摘要This letter presents a modified Doherty power amplifier (DPA) combining network with wide bandwidth (BW) and high power utilization factor (PUF). For the first time, the impact of the excessive phase dispersion of matching networks on the performance of conventional broadband DPA is analytically revealed. For dispersion compensation, an optimized adaptive combining load is introduced to enhance the achievable DPA BW and PUF. For verification, a 42-dBm equal-cell DPA is prototyped to cover 1.4-2.55 GHz. Measurement results indicate that, over the prescribed frequency range, a PUF of over 0.95, back-off efficiency (6 dB) of 48%-58%, and saturation efficiency of 62%-74% can be achieved. Moreover, under WCDMA excitation, the adjacent channel leakage ratio (ACLR) was found to be better than -32 dBc with average efficiency of over 45% without applying digital predistortion techniques.
出版社接受日期26.12.2019
著者Hao-Yu Liu, Xiao-Hu Fang, Kwok-Keung M. Cheng
期刊名稱IEEE Microwave and Wireless Components Letters
出版年份2020
月份2
卷號30
期次2
出版社IEEE
出版地USA
頁次185 - 188
國際標準期刊號1531-1309
電子國際標準期刊號1558-1764
語言美式英語
關鍵詞Adaptive combining load, broadband, Doherty power amplifier (DPA), GaN, phase dispersion, power utilization factor (PUF)

上次更新時間 2020-19-10 於 01:17