A Design Strategy for Bandwidth Enhancement in Three-Stage Doherty Power Amplifier With Extended Dynamic Range

被引：36
作者：
Barthwal, Ayushi [1 ]
Rawat, Karun [2 ,3 ]
Koul, Shiban K. [1 ]
机构：
[1] IIT Delhi, Ctr Appl Res Elect, Delhi 110016, India
[2] Indian Inst Technol Delhi, Delhi 110016, India
[3] Indian Inst Technol Roorkee, Dept Elect & Commun Engn, Roorkee 247667, Uttar Pradesh, India
来源：
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2018年 / 66卷 / 02期
关键词：
Broadband; Doherty power amplifier (DPA); efficiency enhancement; GaN; load modulation; three stage; HIGH-EFFICIENCY; BAND;
D O I：
10.1109/TMTT.2017.2751044
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 paper presents a design strategy to enhance the bandwidth of three-stage Doherty power amplifier (DPA) with operation upto 12-dB back-off. Based on the proposed strategy, a broadband 48-W DPA is designed and implemented using packaged CREE GaN transistors. The measured drain efficiency of 50%-61.8% at 12-dB back-off and 51.9%-66.2% at 6-dB back-off is obtained over the frequency range of 600-900 MHz. Over this 300-MHz band, the drain efficiency is between 51.1% and 78% at saturation. This corresponds to 40% fractional bandwidth. The three-stage DPA is also linearized with a three carrier 15-MHz WCDMA signal with a PAPR of 10.6 dB at various frequencies within operating band and shows the output signal qualifies spectral mask specifications.
引用
收藏
页码：1024 / 1033
页数：10
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