A 38-46 GHz MMIC doherty power amplifier using post-distortion linearization

被引：36
|
作者：
Tsai, Jeng-Han [1 ]
Huang, Tian-Wei
机构：
[1] Natl Taiwan Univ, Dept Elect Engn, Taipei 10617, Taiwan
[2] Natl Taiwan Univ, Grad Inst Commun Engn, Taipei 10617, Taiwan
来源：
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2007年 / 17卷 / 05期
关键词：
Doherty amplifier; millimeter-wave (MMW); monolithic microwave integrated circuit (MMIC); post-distortion;
D O I：
10.1109/LMWC.2007.895726
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This letter describes the first demonstration of a fully integrated Doherty power amplifier (PA) monolithic microwave integrated circuit (MMIC) with post-distortion linearization at millimeter-wave (MMW) frequency band. The Doherty amplifier MMIC, using a 0.15-mu m GaAs HEMT process, achieves a small signal gain of 7 dB from 38 to 46 GHz with a compact chip size of 2 mm(2). The saturation output power of the Doherty amplifier is 21.8 dBm. The similar topology between the Doherty amplifier and post-distortion linearization makes it possible to improve efficiency and linearity simultaneously in MMW PA designs. After gate bias optimization of the main and peaking amplifier, the drain efficiency improved 6% at 6-dB output back-off and the inter-modulation distortion (IMD) of quasi Doherty amplifier can be improved 18 dB at 42 GHz compared with the balanced amplifier operation.
引用
收藏
页码：388 / 390
页数：3
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