应用于WLAN的GaAs HBT功率放大器设计  

Design of GaAs HBT Power Amplifier in WLAN

作　　者：傅海鹏 寇宁 FU Haipeng;KOU Ning(School of Microelectronics,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学微电子学院,天津300072

出　　处：《湖南大学学报（自然科学版）》2023年第2期122-128,共7页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(62074110);国家重点研发计划资助项目(2018YFB2202500)。

摘　　要：提出了一款基于GaAs HBT工艺的高功率功率放大器(Power Amplifier,PA).设计采用三级放大器级联的结构以提高功率放大器的功率增益,在功率晶体管的基极处串联RC有耗稳定网络来提高稳定性及改善增益平坦度,采用电流镜有源偏置的方式提升大信号输出时的功率、效率及线性度表现,同时在输出级放大器处添加功率检测电路以得到随输出功率变化的直流电压信号.EM仿真结果表明:PA的输出频率范围为5.1~6.5 GHz,增益为33~33.7dB,S11、S22<-9.8 dB,饱和输出功率为32.8~34.9 dBm,峰值效率为38.7%~42%,在满足无线局域网标准802.11ax、调制策略为MCS7的情况下,EVM达到-30 dB时输出功率为20~21 dBm,芯片面积为1.69 mm×0.73 mm.测试结果表明:S参数测试结果与仿真结果表现出较好的一致性,PA在满足前述无线局域网标准时输出功率为13.6~19.8 dBm.A power amplifier(PA) with high outputpower based on the GaAs HBT process is proposed. The design adopts the cascade structure of three-stage amplifiers to improve the power gain of the power amplifier.And the RC lossy stabilization network is connected in series at the base of the power transistor to improve the stability and the gain flatness. Active bias is used to improve the output power, efficiency, and linearity performance of large signal output. A power detection circuit is added at the output stage amplifier to obtain a DC voltage signal that varies with the output power. The layout EM simulation results show that: the output frequency range of the PA is 5.1~6.5 GHz, and the gain is 33~33.7 dB. Return loss is less than-9.8 dB, the saturated output power is 32.8~34.9 dBm, and peak efficiency is 38.7 %~42%. In the case of meeting the wireless LAN standard 802.11ax and the modulation strategy of MCS7, the output power is 20~21 dBm when the EVM reaches-30 dB. The chip area is 1.69mm×0.73 mm. The test results show that the S-parameter test results and the simulation results show good consistency, and the output power of the PA is 13.6~19.8dBm when it meets the aforementioned wireless local area network standards.

关 键 词：功率放大器 线性度 异质结双极晶体管(HBT) 

分 类 号：TN752[电子电信—电路与系统]