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时间:2019-06-02
《0506(2)模拟电子技术B卷》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、学院、系专业班级学号姓名······························密································封·······························线···································山东轻工业学院《模拟电子技术》考试试卷(6)(本试卷共4页)题号一二三四五六七总分得分得分阅卷人一、(本题满分20分)填空题1.三极管工作在放大状态时,发射结应偏置,集电结应偏置。若工作在饱和状态,发射结应偏置,集电结应偏置。2.当环境温度升高时,三极管的下列参数变
2、化的趋势是:电流放大系数β,穿透电流ICEO,发射结正向压降UBE的值。3.三极管中有种载流子参与导电,场效应管中有种载流子参与导电。4.若降低放大电路的输出电阻,应当引入的负反馈类型是,若想提高电路的输入电阻,应当引入的负反馈类型是,若同时满足上面两个要求,应当引入的负反馈类型是。5.在差分放大电路中,加在两个输入端的大小相等、极性相同的输入信号称为,而大小相等、极性相反的信号称为。6.在差动放大电路中,若Ui1=–8mV,Ui2=10mV,则差模输入电压为Uid=mV,共模输入电压Uic=mV;若单端输出差模电压增益Aud=–10,共模电压增
3、益为Auc=–0.2,则差动放大电路单端输出电压为U01=mV。7.整流电路的目的是。在纯电阻负载的单相桥式全波整流电路中,若变压器副边电压u2=10sinωt(V),整流二极管导通压降忽略不计,电阻负载上得到的直流电压分量是V;整流二极管承受的反向电压峰值是V。得分阅卷人二、(本题满分15分)设图二所示的电路中rbb,=100Ω,β=50,学院、系专业班级学号姓名······························密································封····························
4、···线···································1.试画出放大电路的直流通路。2.试求ICQ和UCEQ。3.画出放大电路的微变等效电路。4.求AV、Ri和Ro。得分阅卷人三、(本题满分15分)在图三所示的差分放大电路中,已知β=80,rbe=2KΩ。1.求差模输入电阻Ri和输出电阻Ro。2.求差模放大倍数Ad。3.若ui1=7mv,ui2=-1mv,双端输出uo=?学院、系专业班级学号姓名······························密································封·
5、······························线···································得分阅卷人四、(本题满分15分)放大电路如图四所示,试判断级间反馈的类型。如果是负反馈,请按深度负反馈估算闭环电压放大倍数。得分阅卷人五、(本题满分16分)设图五所示两电路中的运放均为理想运放,分别求出两个电路的输出和输入之间的函数关系式。得分阅卷人六、(本题满分9分)由理想运放组成的积分电路如图六所示,输入信号u1=2V,u2=-3V,其它参数如图中所示,t=0时开关K断开,2s末,输出电压达到8V,试求电阻R2应
6、为何值?学院、系专业班级学号姓名······························密································封·······························线···································得分阅卷人七、(本题满分10分)两个正弦波振荡电路如图七所示,试判断其能否产生振荡?如果不能,请对电路做出修正,使其能正常振荡。
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