Extended Efficiency Range, Equal-Cell Doherty Amplifier Design Using Explicit Circuit Model
Publication in refereed journal

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摘要This letter presents the design of a symmetrical Doherty power amplifier (DPA) with extended high-efficiency range by using a new and explicit circuit model. Theoretical analysis reveals that by the adjustment of the electrical length of transmission line sections in the proposed circuit model, new DPA variants with simple circuitry and enhanced output back-off (OBO) are obtained. For experimental verification, a 42-dBm, 2-GHz DPA with OBO of 9.5 dB was designed and fabricated using identical GaN HEMT devices. Under continuous-wave stimulation, measurement results indicate good Doherty behavior can be obtained with 9.5-dB back-off efficiency of 51%-61% and saturation efficiency of 68%-72% over 1.85-2.1 GHz. Moreover, with single carrier WCDMA signal (centered at 2.1 GHz) and peak-to-average power ratio of 9.6 dB, the proposed design is found to deliver an average drain efficiency of 58% and adjacent channel leakage power of -47 dBc at an output power level of 32.5 dBm.
出版社接受日期11.02.2017
著者Xiao-Hu Fang, Hao-Yu Liu, Kwok-Keung M. Cheng
期刊名稱IEEE Microwave and Wireless Components Letters
出版年份2017
月份5
卷號27
期次5
出版社IEEE
出版地USA
頁次497 - 499
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Doherty power amplifier DPA, extended high efficiency range, GaN, symmetrical device

上次更新時間 2020-18-11 於 00:43