A digital predistortion assisted hybrid supply modulator for envelope tracking power amplifiers

被引：5
|
作者：
Salimi, Atefeh [1 ]
Dehghani, Rasoul [1 ]
Nabavi, Abdolreza [2 ]
机构：
[1] Isfahan Univ Technol, Dept Elect & Comp Engn, Esfahan, Iran
[2] Tarbiat Modares Univ, Fac Elect & Comp Engn, Tehran, Iran
来源：
INTEGRATION-THE VLSI JOURNAL | 2016年 / 52卷
关键词：
Envelope tracking (ET); Supply modulator; Digital control; Power amplifier (PA); WiMAX; CONVERTER; REGULATOR; BANDWIDTH;
D O I：
10.1016/j.vlsi.2015.04.002
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
In this paper, a novel digital predistortion assisted supply modulator is presented. The proposed modulator is suitable for envelope tracking power amplifiers. In this topology, a digitally controlled linear power amplifier is used to compensate the switching noise ripples of the switching modulator. The proposed structure is evaluated with a 0.18 mu m CMOS process technology. The results show up to 9% static efficiency improvement in comparison with previous one-phase and two-phase architectures. It is shown that for a 5 MHz WiMAX signal with a 6.7 dB PAPR at 26.8 dBm output power, a maximum average efficiency of 73.5% is achieved in the proposed design. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：282 / 290
页数：9
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