射电天文4-40 GHz超宽带低噪声放大器设计  

Design of 4–40 GHz Ultra-wideband Low Noise Amplifier for Radio Astronomy

作　　者：潘北军 陈卯蒸[1,2] 王浩辉 闫浩 宁云炜[1,2] PAN Bei-jun;CHEN Mao-zheng;WANG Hao-hui;YAN Hao;NING Yun-wei(Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011;Xinjiang Key Laboratory of Microwave Technology,Urumqi 830011;School of Astronomy and Space Sciences,University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院新疆天文台,乌鲁木齐830011 [2]新疆微波技术重点实验室,乌鲁木齐830011 [3]中国科学院大学天文与空间科学学院,北京100049

出　　处：《天文学报》2022年第4期50-58,共9页Acta Astronomica Sinica

基　　金：国家重点研发计划(2018YFA0404703)资助。

摘　　要：超宽带接收机面临众多技术挑战,而关键技术难点之一是超宽带低噪声放大器.采用以砷化镓材料为基底的70 nm栅长改性高电子迁移率晶体管和双电源偏置4级放大电路结构,设计了一款4–40 GHz超宽带低噪声单片微波集成放大器,完整覆盖C、X、Ku、K、Ka共5个波段.设计仿真结果表明,该放大器增益为(40±2.5) dB,常温下噪声温度平均95 K, 4–12.5 GHz噪声温度全频带低于83 K,直流功耗130.5 mW.整个频带内输入反射系数典型值-10 d B,输出反射系数典型值-15 d B,全频带范围内稳定,无自激振荡现象.该器件可做为前置放大器,应用于超宽带接收机和大规模多波束接收机中,可有效提高射电望远镜观测效率.The ultra-wideband receivers face many technical challenges, and one of the key technical difficulties is the ultra-wideband low-noise amplifier(LNA). Using a gallium arsenide material-based 70 nm gate length metamorphic high electron mobility transistor, and dual-supply bias 4-stage amplifier circuit structure, a 4–40 GHz ultra-wideband low-noise monolithic microwave integrated amplifier is designed,which completely covers 5 bands of C, X, Ku, K and Ka. The design simulation results show that the amplifier gain is(40 ± 2.5) dB. The average noise temperature at room temperature is 95 K, the noise temperature of 4–12.5 GHz is lower than 83 K in the whole frequency band, and the DC(direct current)power consumption is 130.5 mW. The input reflection coefficient in the entire frequency band is typically-10 dB, and the output reflection coefficient is typically-15 dB, stable in the whole frequency range, no self-excited oscillation phenomenon. The device can be used in the ultra-wideband receivers and large-scale multi-beam receivers, which improve the observation efficiency of radio telescopes effectively.

关 键 词：望远镜 技术:射电天文 技术:其他诸多方面 

分 类 号：P111[天文地球—天文学]