摘要
根据Doherty技术,设计了一款工作于宽带码分多址信号(W-CDMA)下行频段的改进型高效率功率放大器。在设计过程中,将功放管的膝点电压效应考虑在内并通过减小此效应来提升回退点效率,此外,通过不对称功率输入的设计使得整个功放在更宽的功率范围内保持高效率并获得良好的线性度。为了证明文中的理论分析,采用飞思卡尔公司的LDMOSFET功放管MRF6S21050,最终设计并实现了峰值功率输出(PEP)为100 W的Doherty功率放大器(DPA),测试结果显示,该放大器在回退6 dB和9 dB处的功率附加效率(PAE)分别为40.5%和27.88%,比传统的Doherty功率放大器改善了约3.4%和4.2%。此功率放大器可应用于无线通信领域。
According to the technology of Doherty,an advanced high efficiency power amplifier for the downside frequency band of wide and code division multiple access（W-CDMA） is introduced.During the designing process,the knee voltage effect was taken into account and through crippling the effect,the efficiency of back-off area boost dramatically.In addition,the proposed amplifier maintains perfect efficiency and acceptable linearity over a wider range by employing the uneven input power driver.In order to prove the theoretical analysis,a Doherty power amplifier（DPA） employing Freescale＇s laterally diffused metal oxide semiconductor field effect transistor（LDMOS FET） MRF6S21050 with 100 W peak envelope power（PEP） was designed and realized finally.The measurements show that the proposed DPA exhibits a power-added efficiency（PAE） of 40.05% at 6 dB output power back-off and 27.88% at 9 dB output power back off,which improve about 3.4% and 4.2%,respectively compared to that of the conventional one.The proposed power amplifier can be applied to the wireless communication.
出处
《半导体技术》
CAS
CSCD
北大核心
2012年第11期883-888,共6页
Semiconductor Technology
关键词
宽带码分多址
膝点电压效应
峰值功率输出
DOHERTY功率放大器
不对称功率输入
功率附加效率
wide and code division multiple access（W-CDMA）
knee voltage effect
peak envelope power（PEP）
Doherty power amplifier（DPA）
asymmetrical power drive
power-added efficiency（PAE）
