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低频信号发生器设计I摘要函数信号发生器是各种测试和实验过程中必不可少的工具，在通信、测量、雷达、控制、教学等领域应用十分广泛。不论是在生产、科研还是教学上，信号发生器都是电子工程师信号仿真实验的最佳工具，而且，信号发生器的设计方法很多，设计技术也越来越先进。研究函数信号发生器的设计方法，克服传统方法的缺点，以更好的方法设计出比较复杂的调频、调幅功能的信号发生器。本文采用函数信号发生器芯片ICL8038设计了一种信号发生器，完成了信号发生器的总体方案设计、硬件电路设计和软件设计。硬件电路主要包括信号产生电路、单片机最小系统、频率控制电路、幅值控制电路以及键盘电路。单片机最小系统负责系统控制，键盘电路用于波形的选择、频率的控制和幅值的控制。末级的放大电路则对生成的信号进行适当的放大，以提高信号的振幅和强度。软件部分主要实现输出信号的波形选择，输出信号的频率和幅值的调节。关键词：信号发生器，ICL8038，频率调节，幅值调节电气工程学院毕业设计（论文）IIAbstractFunctionsignalgeneratorisallsortsoftestandexperimentprocesstheessentialtool,incommunication,measuring,radar,control,teachingfieldsusedwidely.Bothinproductionandscientificresearchorteaching,signalgeneratorareelectronicengineersignalsimulationexperiment,andthebesttool,signalgeneratorsignalgeneratordesigntechnologyisbecomingmoreandmoreadvanced.Researchfunctionsignalgeneratordesignmethods,overcomeshortcomingsoftraditionalmethods,inordertobetterdesignedcomplexFM,attenuationfunctionsignalgenerator.Inthispaper,thefunctionsignalgeneratorICL8038chipwasadoptedtodesignakindofsignalgenerator.Thissignalgeneratormainlyincludestheoveralldesignofthewholesystemstructure,thedesignofhardwareandsoftware.Hardwarecircuitismainlyincludingsignaloutputcircuit,single-chipmicrocomputerminimumsystem,waveformsoutputcircuit,frequencycontrolcircuit,amplitudecontrolcircuitandkeyboardcircuit.Singlechipminimizesystemisresponsibleforusersinteractionandsystemcontrol,keyboardcircuitforselectionofwaveform,frequencyandamplitudecontrol.Thelaststageamplifiercircuitisthesignaltogenerateproperamplifier,inordertoimprovethesignalamplitudeandstrength.Thesoftwaredesignmainlyusedtorealizetheselectionofwaveformtype,changeoffrequencyandamplitude.KeywordsSignalgenerator,ICL8038,changeoffrequency,changeofamplitude低频信号发生器设计III目录摘要.........................................................................................................................................IAbstract.................................................................................................................................II1绪论...............................................................................................................................-1-1.1信号发生器概述.................................................................................................-1-1.2信号发生器的发展状况.....................................................................................-1-1.3本文的主要工作.................................................................................................-3-2信号发生器的总体方案设计.......................................................................................-4-2.1信号发生器的总体方案...................................................................................-4-2.1.1信号发生部分...............................................................................................-4-2.1.2信号幅值控制部分.......................................................................................-4-2.1.3信号频率控制部分.......................................................................................-5-2.2硬件总体方案.....................................................................................................-5-2.3软件总体方案....................................................................................................-6-2.4本章小结............................................................................................................-6-3信号发生器的硬件电路设计.......................................................................................-8-3.1信号产生电路.....................................................................................................-8-3.1.1ICL8038内部原理.....................................................................................-8-3.1.2电路分析.....................................................................................................-10-3.2单片机最小系统..............................................................................................-12-3.2.1主要特性.....................................................................................................-13-3.2.2管脚说明（图3.5）...................................................................................-14-3.2.3单片机电源.................................................................................................-17-3.3频率控制模块..................................................................................................-17-3.4幅值控制模块..................................................................................................-18-3.4.1幅值控制模块的原理.................................................................................-18-3.4.2AD603简介.................................................................................................-19-3.4.3D/A转换原理介绍......................................................................................-20-3.4.4DAC0832引脚介绍....................................................................................-21-3.5波形选择模块...................................................................................................-23-3.6键盘控制模块.......................................