基于砷化镓晶体管的1.35~2.0 GHz低噪声放大器  

1.35-2.0 GHz Low Noise Amplifier Based on GaAs Transistor

作　　者：江龙 李建斌[1,2,3] 刘鸿飞 柴晓明[1] Jiang Long;Li Jianbin;Liu Hongfei;Chai Xiaoming(National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Five-hundred-meter Aperture Spherical radio Telescope,Beijing 100101,China)

机构地区：[1]中国科学院国家天文台,北京100101 [2]中国科学院大学,北京100049 [3]中国科学院FAST重点实验室,北京100101

出　　处：《天文研究与技术》2020年第3期276-282,共7页Astronomical Research & Technology

基　　金：国家自然科学天文联合基金(U1831110);国家自然科学青年基金(11703048);国家自然科学基金面上项目(11173037);西藏自治区重点研发及转化计划项目(XZ201901-GB-21)资助。

摘　　要：低噪声放大器(Low Noise Amplifier,LNA)是接收机系统的关键器件,其性能决定了接收机系统的噪声温度和对微弱射电信号的放大能力。采用Avago公司砷化镓(GaAs)工艺的pHEMT ATF-54134研制了一款可工作在1.35~2.0 GHz频率范围内的低噪声放大器。该放大器采用两级拓扑结构,单电源自偏置供电,典型增益28 dB,典型噪声温度35 K,输入回波损耗优于-10 dB,输出回波损耗优于-15 dB,输入1 dB压缩点为-13 dBm。该放大器除了可用于对中性氢、脉冲星和羟基进行观测的射电望远镜接收机以外,还可用于电波环境监测系统。Low Noise Amplifier(LNA)is a key device in the receiving system in radio astronomy.The noise performance of LNA dominated the system noise temperature and the ability of radio telescope to detect extremely weak signal.In this paper,we designed an LNA based on GaAs process PHEMT ATF-54143.This LNA used 2-stage transistors topology circuit and was supplied by single voltage 5 V.Measured results show hat in its working range from 1.35 GHz to 2.0 GHz,the input loss is better than-10 dB with a typical noise temperature 35 K.It provides a typical gain of 28 dB and the 1 dB-compression point is at-13 dBm.This amplifier can be used in radio telescope receivers for the observation of neutral hydrogen,pulsars and hydroxyl groups in radio astronomy,as well as in radio environment monitoring systems.

关 键 词：低噪声放大器 射电天文接收机 砷化镓晶体管 输入1 dB压缩点 两级拓扑电路 

分 类 号：TN722.1[电子电信—电路与系统]