单级共射放大电路实验报告.docx
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单级共射放大电路实验报告.docx
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单级共射放大电路实验报告
单级共射放大电路实验报告
一、实验目的
1.熟悉常用电子仪器的使用方法。
2.掌握放大器静态工作点的调试方法及对放大器电路性能的影响。
3.掌握放大器动态性能参数的测试方法。
4.进一步掌握单级放大电路的工作原理。
二、实验仪器
1.示波器
2.信号发生器
3.数字万用表
4.交流毫伏表
5.直流稳压源
三、预习要求
1.复习基本共发射极放大电路的工作原理,并进一步熟悉示波器的
正确使用方法。
2.根据实验电路图和元器件参数,估算电路的静态工作点及电路的
电压放大倍数。
3.估算电路的最大不失真输出电压幅值。
4.根据实验内容设计实验数据记录表格。
四、实验原理及测量方法
实验测试电路如下图所示:
feelfreetolistentotheirvoicesandhelpthemassessolveproblems,wewereofficiallyopenedonMay10"12345"Mayorcalls,formulatedrulesandregulations,equippedwithafull-timestaff,a24-houron-dutysystem,peopletocalltoreceive,reply,action,reminders,feedbackandsoon.Byyearend,handledthecrowdcalls1076,94.7%feedbackrate.ByMayorcallsactivecoordinationtosolvealargenumberofbearsontheimmediateinterestsofthepeopleandissuesofgreatlives,butalsoforleadershipresearchanddecisiontocollectalotofgoodideasandsuggestions,byallsectorsofthecommunityalike.Second,startMunicipalGovernmentAffairsHallbuilt.OnMay11,webuiltandlaunchedthecity-governmentlobby,weresettledin12departments,strictimplementationoffirstaskingdutysystem,servicesystem,systemofgratuitous,"receiving,internalcoordination,headofthewindowhandle,limitedtimeconcluded"one-stopservice.Bytheendoftodaytoacceptvarioustypesof3,273,originallyofupto100%.RunningGovernmentAffairsHall,theconvenienceofthemasses,promotingopenGovernment,improvetheinvestmentenvironmentandsolvetheirpracticalproblems,andsodidalotofwork,masses,servethecommunityfortheGovernmenttoplayaverygood"window,link,model".Third,createacitygovernmentpublicaffairsnetwork.WerelyontheGovernmentWebsite,wascompletedonMay24,theprovince'sfirstpublicaffairsnetwork.Over
1.电路参数变化对静态工作点的影响:
放大器的基本任务是不失真地放大信号,实现输入变化量对输出变化量的控制作用,要使放大器正常工作,除要保证放大电路正常工作的电压外,还要有合适的静态工作点。
放大器的静态工作点是指放大器输入端短路时,流过电路直流电流IBQ、ICQ及管子C、E极之间的直流电压UCEQ和B、E极的直流电压UBEQ。
图5-2-1中的射极电阻BE1、RE2是用来稳定放大器的静态工作点。
其工作原理如下。
1用RB和RB2的分压作用固定基极电压UB。
?
由图5-2-1可各,当RB、RB2选择适当,满足I2远大于IB时,则有
UB=RB2?
VCC/(RB+RB2)
式中,RB、RB2和VCC都是固定不随温度变化的,所以基极电位基本上是一定值。
2?
通过IE的负反馈作用,限制IC的改变,使工作点保持稳定。
具体稳定过程如下:
T?
?
IC?
?
IE?
?
UE?
?
UBE?
?
IB?
?
IC?
2.静态工作点的理论计算:
图5-2-1电路的静态工作点可由以下几个关系式确定feelfreetolistentotheirvoicesandhelpthemassessolveproblems,wewereofficiallyopenedonMay10"12345"Mayorcalls,formulatedrulesandregulations,equippedwithafull-timestaff,a24-houron-dutysystem,peopletocalltoreceive,reply,action,reminders,feedbackandsoon.Byyearend,handledthecrowdcalls1076,94.7%feedbackrate.ByMayorcallsactivecoordinationtosolvealargenumberofbearsontheimmediateinterestsofthepeopleandissuesofgreatlives,butalsoforleadershipresearchanddecisiontocollectalotofgoodideasandsuggestions,byallsectorsofthecommunityalike.Second,startMunicipalGovernmentAffairsHallbuilt.OnMay11,webuiltandlaunchedthecity-governmentlobby,weresettledin12departments,strictimplementationoffirstaskingdutysystem,servicesystem,systemofgratuitous,"receiving,internalcoordination,headofthewindowhandle,limitedtimeconcluded"one-stopservice.Bytheendoftodaytoacceptvarioustypesof3,273,originallyofupto100%.RunningGovernmentAffairsHall,theconvenienceofthemasses,promotingopenGovernment,improvetheinvestmentenvironmentandsolvetheirpracticalproblems,andsodidalotofwork,masses,servethecommunityfortheGovernmenttoplayaverygood"window,link,model".Third,createacitygovernmentpublicaffairsnetwork.WerelyontheGovernmentWebsite,wascompletedonMay24,theprovince'sfirstpublicaffairsnetwork.Over
UB=RB2?
VCC/(RB+RB2)
IC?
IE=(UB-UBE)/RE
UCE=VCC-IC(RC+RE)
由以上式子可知,,当管子确定后,改变VCC、RB、RB2、RC、(或RE)中任一参数值,都会导致静态工作点的变化。
当电路参数确定后,静态工作点主要通过RP调整。
工作点偏高,输出信号易产生饱和失真;工作点偏低,输出波形易产生截止失真。
但当输入信号过大时,管子将工作在非线性区,输出波形会产生双向失真。
当输出波形不很大时,静态工作点的设置应偏低,以减小电路的表态损耗。
3.静态工作点的测量与调整:
调整放大电路的静态工作点有两种方法
(1)将放大电路的输入端电路(即Ui=0),让其工作在直流状态,用直流电压表测量三极管C、E间的电压,调整电位器RP使UCE稍小于电源电压的1/2(本实验为UCE为4V即可),这表明放大电路的静态工作点基本上已设置在放大区,然后再测量B极对地的电位并记录,根据测量值计算态工作点值,以确保三极管工作在导通状态。
(2)放大电路接通直流电源,并在输入端加上正弦信号(幅度约为10mV,频率约为1kHz),使其工作在交直流状态,用示波器监视输出电压波形,调整基极电阻RP,使输出信号波形不失真,并在输入信号增大信号增大时,输出波形同时出现截止失真和饱和失真。
这表明电路的静态工作点处于放大区的最佳位置。
撤去输入正弦信号(即令UI=0),使电路工作在直流状态,用直流状态,用直流电压表测量三极管三个极对地的电压UB、UE、UC,即可计算出放大器的直流工作点ICQ、UCEQ、UBEQ的大小。
4.电压放大倍数的测量与计算
电压放大倍数是指放大电路输出端的信号电压与输入端的信号电压之比,即:
AU=Uo/Ui
图5-2-1电路中
Au=-β(Rc//RL)/rbe
Rbe=rbEQ\*jc2\*"Font:
TimesNewRoman"\*hps7\o\ad(\s\up6(/b,EQ\*jc2\*"Font:
TimesNewRoman"\*hps7\o\ad(\s\up6(/,b
+(1+β)26mV/IEQEQ\*jc2\*"Font:
TimesNewRoman"\*hps7\o\ad(\s\up6(/其中,rbb,EQ\*jc2\*"Font:
TimesNewRoman"\*hps7\o\ad(\s\up6(/,b一般取300Ω。
当放大电路的静态工作点设置合理后,在电路的输入端加入正弦信号,用示波器观察放大电路的输出波形,并调节输入信号幅度,使输出波形基本不失真。
用交流毫伏表或示波器分别测量放大电路的输入、输出电压,按定义式计算即可得电路的电压放大倍数。
五、实验内容及步骤
feelfreetolistentotheirvoicesandhelpthemassessolveproblems,wewereofficiallyopenedonMay10"12345"Mayorcalls,formulatedrulesandregulations,equippedwithafull-timestaff,a24-houron-dutysystem,peopletocalltoreceive,reply,action,reminders,feedbackandsoon.Byyearend,handledthecrowdcalls1076,94.7%feedbackrate.ByMayorcallsactivecoordinationtosolvealargenumberofbearsontheimmediateinterestsofthepeopleandissuesofgreatlives,butalsoforleadershipresearchanddecisiontocollectalotofgoodideasandsuggestions,byallsectorsofthecommunityalike.Second,startMunicipalGovernmentAffairsHallbuilt.OnMay11,webuiltandlaunchedthecity-governmentlobby,weresettledin12departments,strictimplementationoffirstaskingdutysystem,servicesystem,systemofgratuitous,"receiving,internalcoordination,headofthewindowhandle,limitedtimeconcluded"one-stopservice.Bytheendoftodaytoacceptvarioustypesof3,273,originallyofupto100%.RunningGovernmentAffairsHall,theconvenienceofthemasses,promotingopenGovernment,improvetheinvestmentenvironmentandsolvetheirpracticalproblems,andsodidalotofwork,masses,servethecommunityfortheGovernmenttoplayaverygood"window,link,model".Third,createacitygovernmentpublicaffairsnetwork.WerelyontheGovernmentWebsite,wascompletedonMay24,theprovince'sfirstpublicaffairsnetwork.Over
1.静态工作点的调整测量
经过调整滑动变阻器,滑动变阻器阻值为90%时最大不失真,如图所示:
电源电压UB(V)U(EV)U(CV)UBE(V)UCE(V)IB(QMA)ICQ(MA)
12V1.580.9910.220.599.230.0785.43
9V1.190.617.920.587.310.0574.01
6V0.800.245.580.565.340.0372.59静态工作点理论值:
VCC为12V时,UB=1.68V,IC=0.389MA,UCE=8.92V
误差:
(8.92-9.23)/8.92=3.47%
feelfreetolistentotheirvoicesandhelpthemassessolveproblems,wewereofficiallyopenedonMay10"12345"Mayorcalls,formulatedrulesandregulations,equippedwithafull-timestaff,a24-houron-dutysystem,peopletocalltoreceive,reply,action,reminders,feedbackandsoon.Byyearend,handledthecrowdcalls1076,94.7%feedbackrate.ByMayorcallsactivecoordinationtosolvealargenumberofbearsontheimmediateinterestsofthepeopleandissuesofgreatlives,butalsoforleadershipresearchanddecisiontocollectalotofgoodideasandsuggestions,byallsectorsofthecommunityalike.Second,startMunicipalGovernmentAffairsHallbuilt.OnMay11,webuiltandlaunchedthecity-governmentlobby,weresettledin12departments,strictimplementationoffirstaskingdutysystem,servicesystem,systemofgratuitous,"receiving,internalcoordination,headofthewindowhandle,limitedtimeconcluded"one-stopservice.Bytheendoftodaytoacceptvarioustypesof3,273,originallyofupto100%.RunningGovernmentAffairsHall,theconvenienceofthemasses,promotingopenGovernment,improvetheinvestmentenvironmentandsolvetheirpracticalproblems,andsodidalotofwork,masses,servethecommunityfortheGovernmenttoplayaverygood"window,link,model".Third,createacitygovernmentpublicaffairsnetwork.WerelyontheGovernmentWebsite,wascompletedonMay24,theprovince'sfirstpublicaffairsnetwork.Over
放大电路动态研究:
AU=UO/Ui=30.6
feelfreetolistentotheirvoicesandhelpthemassessolveproblems,wewereofficiallyopenedonMay10"12345"Mayorcalls,formulatedrulesandregulations,equippedwithafull-timestaff,a24-houron-dutysystem,peopletocalltoreceive,reply,action,reminders,feedbackandsoon.Byyearend,handledthecrowdcalls1076,94.7%feedbackrate.ByMayorcallsactivecoordinationtosolvealargenumberofbearsontheimmediateinterestsofthepeopleandissuesofgreatlives,butalsoforleadershipresearchanddecisiontocollectalotofgoodideasandsuggestions,byallsectorsofthecommunityalike.Second,startMunicipalGovernmentAffairsHallbuilt.OnMay11,webuiltandlaunchedthecity-governmentlobby,weresettledin12departments,strictimplementationoffirstaskingdutysystem,servicesystem,systemofgratuitous,"receiving,internalcoordination,headofthewindowhandle,limitedtimeconcluded"one-stopservice.Bytheendoftodaytoacceptvarioustypesof3,273,originallyofupto100%.RunningGovernmentAffairsHall,theconvenienceofthemasses,promotingopenGovernment,improvetheinvestmentenvironmentandsolvetheirpracticalproblems,andsodidalotofwork,masses,servethecommunityfortheGovernmenttoplayaverygood"window,link,model".Third,createacitygovernmentpublicaffairsnetwork.WerelyontheGovernmentWebsite,wascompletedonMay24,theprovince'sfirstpublicaffairsnetwork.Over
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