0506(2)模拟电子技术B卷

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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。