集成运放参数测试仪——程序设计内容摘要：该课题设计的运算放大器闭环参数测试系统是基于MSC-51单片机控制模块，并且由LCD（LiquidCrystalDisplay）显示模块，键盘模块，数据采集和转换模块，采用DDS芯片（AD9851）实现了40kHz～4MHz的扫频输出模块等五部分组成。采用辅助运放测试方法，可对运放的输入失调电压、输入失调电流、交流差模开环电压增益和交流共模抑制比以及单位增益带宽进行测量。在软件上，用C语言来编程实现。其要实现的功能包括：对来自TLC2543A/D转换的数字信号进行接收、分析、计算和对结果的显示；通过不同键值的接收、分析来控制对不同对象的测量,并在LCD上显示对应的人机界面；对来自DDS的高频信号源的频率进行控制来实现对集成运放的带宽参数的测试和显示。而且具有自动量程转换、自动测量功能和良好的人机交互性。关键词：单片机C语言DDSLCD人机交互界面TheInstrumentfortestingtheParametersofIntegratedOperationAmplifier——programdesignAbstract：ThissystemisdesignedbasedonC51microcontrollertomeasurethecloseloopparametersoftheoperationamplifier.Thesystemconcludefivemodules:LCD(liquidcrystaldisplay)displaymodule,keyboardmodule,datacollectionmodule,conversionmodule,andthemoduleofgeneratingsweepsine-wavesignalwithfrequencyrangefrom40kHzto4MHz,usingtheDDSchipofAD9851.Thesystemcanmeasuretheinputoffsetvoltage、theinputoffsetcurrent、theopenloopACdifferentialmodevoltagegain、theACcommonmoderejectionratioandunitgainbandwidth，usingthemeasuremethodofassistantamplifier.ThedatacanbedisplayontheLCDwhichisusingofCprogram.Andthefunctionconcludes:receiving,analysingandcalculatingthedigitalsignalsfromTLC2543A/Dthensendthemtoshow;acceptingdifferentkeyvalueonkeyboards,analysingandprocessingitforcontrollingthemeasurementofdifferenttargetanddisplayontheLCDwithdifferentcomputerinterface;controllingthebandwidthofHFsignalsourcefromDDSchiptomeasuretheintegratedtransportbandwidthparametersanddisplaytheresult.What’smoreC51microcontrollercancontrolrelaystocompleteautomeasurementrangeswitching,automeasuringandgoodinterface.KeyWords：MCUCLanguageDDSLCDinterface目录前言.............................................................................1一、系统原理框图.................................................................1二、硬件单元电路设计与实现.......................................................2（一）、、、四个参数的测试电路.................................2（二）单位增益带宽测量电路.................................................3（三）测试的信号源................................................3（四）峰峰值检测电路的设计.................................................4（五）A/D采样电路.........................................................4（六）扫频信号源...........................................................4（七）键盘接口电路.........................................................5（八）显示接口电路.........................................................5三、软件设计.....................................................................6（一）软件功能设计.........................................................6（二）系统软件框图和程序流程图.............................................6（三）软件模块设计.........................................................7四、系统测试....................................................................19（一）程序调试方法..........................................................19（二）软件调试..............................................................19（三）联机调试..........
