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1、高频小信号宽带直流放大器的电路设计摘要随着微电子技术的发展，小信号的处理在通信和信息处理领域运用越来越广泛，宽带运算放大器广泛应用于A/D转换器、D/A转换器，有源滤波仪、波形发生器、广播、电视、通信、雷达等的接收机等电路中，然而对小信号的增益可控成为小信号放大的重点和难点。本设计主要是运用模拟电子线路的知识，利用AD603为核心设计的宽带直流放大器。在介绍AD603的基础上，针对各种接收机对宽带直流放大电路的要求,设计实现了一种基于宽带放大器AD603的AGC放大电路对其整体结构进行了详细的设计,并根据电路要
2、求设计了跟随器输出电路及取样反馈电路,该放大电路具有增益高、AGC范围宽、负载能力强、输出幅度恒定、工作性能稳定等优点,能够满足一般接收机的使用场合，本文中所描述的AGC具有理论上84dB的动态范围，90MHz的带宽，检波电路采用三极管检波，成本低，调试简单。关键词：AD603；宽带直流放大器；AGCAbstractAlongwiththedevelopmentofmicroelectronicstechnology,smallsignalprocessingincommunicationandinformat
3、ionprocessingfieldisusedwidely,broadbandop-amparewidelyusedinA/Dconverter,D/Aconverter,activefilterapparatus,waveformgenerator,radio,television,communication,radar,etc,thereceivercircuitstosmallsignalgain,howeversmallsignalmagnifiedcontrolledbecomeimportanta
4、nddifficult.Thisdesignismainlyusinganalogelectroniccircuitknowledge,useAD603asthecoredesignofbroadbanddcamplifier.OnthebasisofintroductionAD603receivertobroadband,accordingtovariousrequirementsofdcamplifiercircuit,designedandimplementedaAD603basedonbroadband
5、amplifieramplifiercircuitofAGCofitswholestructurecarriedonthedetaileddesign,andaccordingtothecircuitdesignrequirementfortheoutputcircuitandsamplingfolloweddevice,themagnifyingcircuitfeedbackcircuitwithgainwiderange,high,AGCoutputamplitudeloadability,constant
6、,workstableperformanceadvantages,cansatisfythegeneraluseofoccasions,thispaperreceiverdescribedinthe84dBofAGCpossessesthetheoretical90MHzdynamicrange,thebandwidth,detectioncircuitUSEStriodedetection,lowcost,commissioningsimple.KeyWords：AD603;WidebandDCAmplifi
7、er;AGC目录第1章绪论.........................................................................................................................11.1宽带放大器的应用前景及研究意义....................................................................11.2宽带放大器概述..........................
8、..........................................................................11.3宽带放大器概述....................................................................................................21.3.1开环带
